Initial commit E300 support.

42 files changed, 7558 insertions, 9 deletions

diff --git a/host/docs/mainpage.dox b/host/docs/mainpage.dox
index 597938c35..17f01cfc0 100644
--- a/host/docs/mainpage.dox
+++ b/host/docs/mainpage.dox
@@ -39,6 +39,7 @@ devices and how to use the API to connect to them through your own software.
 ## USRP E-Series Devices
 
 \li \subpage page_usrp_e1x0
+\li \subpage page_usrp_e3x0
 \li \subpage page_gpsdo
 
 ## USRP X-Series Devices
diff --git a/host/docs/usrp_e3x0.dox b/host/docs/usrp_e3x0.dox
new file mode 100644
index 000000000..bfa9ebf11
--- /dev/null
+++ b/host/docs/usrp_e3x0.dox
@@ -0,0 +1,302 @@
+/*! \page page_usrp_e3x0 USRP-E3x0 Series Device Manual
+
+\tableofcontents
+
+\section e3x0_feature_list Comparative features list
+
+- Hardware Capabilities:
+	  Integrated RF frontend (70 MHz - 6 GHz)
+	- External PPS reference input
+	- External 10 MHz reference input
+	- Configurable clock rate
+	- Internal GPIO connector with UHD API control
+	- 2 USB 2.0 Host ports
+	- Internal GPSDO
+	- Soundcard mono input / stereo output
+	- USB UART
+	- Zynq-7020 FPGA
+- FPGA Capabilities:
+	- 2 RX DDC chains in FPGA
+	- 2 TX DUC chain in FPGA
+	- Timed commands in FPGA
+	- Timed sampling in FPGA
+	- 16-bit and sample modes (sc16)
+	- Up to 10 MHz of RF bandwidth with 16-bit samples
+
+\section e3x0_getting_started Getting started
+
+This will run you through the first steps relevant to get your USRP E300/310
+up and running.
+
+\subsection e3x0_first_boot First boot
+
+After unpacking and assembling your USRP E300/E310 insert the micro sd card into the micro sd card slot.
+
+There are two different methods to connect to the device
+
+- using the onboard serial to usb connector
+- using the gigabit ethernet connector and a ssh client on your host computer
+
+For the first boot, booting with the serial cable connected to the device
+is recommended, as it allows to review and modify the network configuration,
+and allows to enter the bootloader in case of issues during the boot.
+
+
+\subsubsection e3x0_first_boot_serial Serial connection
+
+To use the serial connection together with a Linux or OSX machine (most other UNIX variants come with a version of screen, too)
+a terminal emulator such as screen can be used:
+
+    $ sudo screen /dev/ttyUSB0 115200
+
+The exact device node /dev/ttyUSB0 depends on your operating system's driver and other USB devices that might be already connected.
+It can be usually found by perusing the output of dmesg or journalctl, after connecting the USRP E300/E310 device to your host computer.
+
+An example of a dmesg output for the serial to usb converter:
+
+    924.102764] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0
+
+
+On Microsoft Windows the serial connection can be established using a tool such as Putty by selecting a baudrate of 115200 and the corresponding serial port for the serial to usb converter.
+
+In both cases you should see boot messages fly by and finally end up with a login prompt similar to the following:
+
+TODO!!
+
+Note: The username is 'root' and the default password is empty.
+
+You should be presented with a shell similar to the following
+
+    root@ettus-e300:~#
+
+
+\subsubsection e3x0_first_boot_ssh SSH connection
+
+The USRP E300/E310 device relies on the DHCP protocol to automatically obtain an IP address.
+In case your network setup does not include a DHCP server, refer to the section \ref e3x0_first_boot_serial or configure a DHCP server to hand out IP addresses on your network.
+
+After the device obtained an IP address you can log in from a Linux or OSX machine by typing:
+
+    $ ssh root@192.168.10.42
+
+where the IP address depends on your local network setup.
+
+On Microsoft Windows again the connection can be established using a tool such as Putty, by selecting a username of root without password.
+
+You should be presented with a shell similar to the following
+
+    root@ettus-e300:~#
+
+\section e3x0_hw Hardware Setup
+
+\section e3x0_load_fpga_imgs Load FPGA Images onto the Device
+
+The USRP-X Series device ships with a bitstream pre-programmed in the flash,
+which is automatically loaded onto the FPGA during device power-up. However,
+a new FPGA image can be configured over the PCI Express interface or the
+on-board USB-JTAG programmer. This process can be seen as a "one-time load", in
+that if you power-cycle the device, it will not retain the FPGA image.
+
+Please note that this process is *different* than replacing the FPGA image
+stored in the flash, which will then be automatically loaded the next time the
+device is reset.
+
+\subsection e3x0_load_fpga_imgs_jtag Use JTAG to load FPGA images
+
+The USRP-E Series device features an on-board JTAG connector that can be accessed on the PCB
+of the device. The iMPACT tool in the <a href="http://www.xilinx.com/support/download/index.htm">Xilinx Programming Tools (ISE, iMPACT)</a> package can be used to load an image over the JTAG interface. This can be useful for unbricking devices.
+
+If you have iMPACT installed, you can use the `impact_jtag_programmer.sh` tool to install images. Make sure your e3x0 is powered on and connected to your computer using the internal JTAG connector. Then run the tool:
+
+    <path_to_uhd_tools>/impact_jtag_programmer.sh --fpga-path=<fpga_image_path>
+
+\subsection e3x0_setup_change_ip Change the USRP's IP address
+
+You may need to change the USRP's IP address for several reasons:
+- to satisfy your particular network configuration
+- to use multiple USRP-E Series devices with the same host computer
+- to set a known IP address into USRP (in case you forgot)
+
+\section e3x0_addressing Addressing the Device
+
+\subsection e3x0_addressing_singledev Single device configuration
+
+In a single-device configuration,
+the USRP device must have a unique IPv4 address on the host computer.
+The USRP can be identified through its IPv4 address or resolvable hostname.
+See the application notes on \ref page_identification.
+Use this addressing scheme with the uhd::usrp::multi_usrp interface (not a typo!).
+
+Example device address string representation for a USRP-E Series device with IPv4 address 192.168.10.2:
+
+    addr=192.168.10.2
+
+\subsection e3x0_addressing_multidevcfg Multiple device configuration
+
+In a multi-device configuration,
+each USRP device must have a unique IPv4 address on the host computer.
+The device address parameter keys must be suffixed with the device index.
+Each parameter key should be of the format \<key\>\<index\>.
+Use this addressing scheme with the uhd::usrp::multi_usrp interface.
+
+- The order in which devices are indexed corresponds to the indexing of the transmit and receive channels.
+- The key indexing provides the same granularity of device identification as in the single device case.
+
+Example device address string representation for 2 USRPs with IPv4 addresses **192.168.10.2** and **192.168.20.2**:
+
+    addr0=192.168.10.2, addr1=192.168.20.2
+
+
+\section e3x0_comm_problems Communication Problems
+
+When setting up a development machine for the first time,
+you may have various difficulties communicating with the USRP device.
+The following tips are designed to help narrow down and diagnose the problem.
+
+\subsection e3x0_comm_problems_runtimeerr RuntimeError: no control response
+
+This is a common error that occurs when you have set the subnet of your network
+interface to a different subnet than the network interface of the USRP device.  For
+example, if your network interface is set to **192.168.20.1**, and the USRP device is **192.168.10.2**
+(note the difference in the third numbers of the IP addresses), you
+will likely see a 'no control response' error message.
+
+Fixing this is simple - just set the your host PC's IP address to the same
+subnet as that of your USRP device. Instructions for setting your IP address are in the
+previous section of this documentation.
+
+\subsection e3x0_comm_problems_firewall Firewall issues
+
+When the IP address is not specified,
+the device discovery broadcasts UDP packets from each Ethernet interface.
+Many firewalls will block the replies to these broadcast packets.
+If disabling your system's firewall
+or specifying the IP address yields a discovered device,
+then your firewall may be blocking replies to UDP broadcast packets.
+If this is the case, we recommend that you disable the firewall
+or create a rule to allow all incoming packets with UDP source port **49152**.
+
+\subsection e3x0_comm_problems_ping Ping the device
+The USRP device will reply to ICMP echo requests ("ping").
+A successful ping response means that the device has booted properly
+and that it is using the expected IP address.
+
+    ping 192.168.10.2
+
+\subsection e3x0_comm_problems_monitor Monitor the host network traffic
+Use Wireshark to monitor packets sent to and received from the device.
+
+\subsection e3x0_comm_problems_leds Observe Ethernet port LEDs
+When there is network traffic arriving at the Ethernet port, LEDs will light up.
+You can use this to make sure the network connection is correctly set up, e.g.
+by pinging the USRP and making sure the LEDs start to blink.
+
+\section e3x0_hw Hardware Notes
+
+\subsection e3x0_hw_fpanel Front Panel
+
+\image html e3x0_fp_overlay.png "e3x0"
+
+- **RF A Group**
+  + **TX/RX LED**: Indicates that data is streaming on the TX/RX channel on daughterboard A
+  + **RX2 LED**: Indicates that data is streaming on the RX2 channel on daughterboard A
+- **REF**: Indicates that the external Reference Clock is locked
+- **PPS**: Indicates a valid PPS signal by pulsing once per second
+- **AUX I/O**: Front panel GPIO connector.
+- **GPS**: Indicates that GPS reference is locked
+- **LINK**: Indicates that the host computer is communicating with the device (Activity)
+
+- **RF B Group**
+  + **TX/RX LED**: Indicates that data is streaming on the TX/RX channel on daughterboard B
+  + **RX2 LED**: Indicates that data is streaming on the RX2 channel on daughterboard B
+- **PWR**: Power switch
+
+\subsection e3x0_hw_rear_panel Rear Panel
+
+\image html e3x0_rp_overlay.png "e3x0 Rear Panel"
+
+- **PWR**: Connector for the USRP-X Series power supply
+- **1G/10G ETH**: SFP+ ports for Ethernet interfaces
+- **REF OUT**: Output port for the exported reference clock
+- **REF IN**: Reference clock input
+- **PCIe x4**: Connector for Cabled PCI Express link
+- **PPS/TRIG OUT**: Output port for the PPS signal
+- **PPS/TRIG IN**: Input port for the PPS signal 
+- **GPS**: Connection for the GPS antenna
+
+\subsection e3x0_hw_e3x0_hw_ref10M Ref Clock - 10 MHz
+
+Using an external 10 MHz reference clock, a square wave will offer the best phase
+noise performance, but a sinusoid is acceptable.  The power level of the reference clock cannot exceed +15 dBm.
+
+\subsection e3x0_hw_pps PPS - Pulse Per Second
+Using a PPS signal for timestamp synchronization requires a square wave signal with the following a 5Vpp amplitude.
+
+To test the PPS input, you can use the following tool from the UHD examples:
+
+- `<args>` are device address arguments (optional if only one USRP device is on your machine)
+
+    cd <install-path>/lib/uhd/examples
+    ./test_pps_input --args=\<args\>
+
+\subsection e3x0_hw_gpsdo Internal GPSDO
+
+Please see \ref page_gpsdo_e3x0 for information on configuring and using the internal GPSDO.
+
+\subsection e3x0_hw_gpio Internal GPIO
+
+### Connector
+
+\image html e3x0_gpio_conn.png "e3x0 GPIO Connector"
+
+### Pin Mapping
+
+- Pin 1:  +3.3V
+- Pin 2:  Data[0]
+- Pin 3:  Data[1]
+- Pin 4:  Data[2]
+- Pin 5:  Data[3]
+- Pin 6:  Data[4]
+- Pin 7:  Data[5]
+- Pin 8:  Data[6]
+- Pin 9:  Data[7]
+- Pin 10: Data[8]
+TODO:
+
+
+Please see the \ref page_gpio_api for information on configuring and using the GPIO bus.
+
+\subsection e3x0_hw_chipscope Debugging custom FPGA designs with Xilinx Chipscope
+
+Xilinx chipscope allows for debugging custom FPGA designs similar to a logic analyzer.
+USRP-E series devices can be used with Xilinx chipscope using the internal JTAG connector.
+
+Further information on how to use Chipscope can be found in the Xilinx Chipscope Pro Software and Cores User Guide (UG029).
+
+\section e3x0_misc Miscellaneous
+
+\subsection e3x0_misc_multirx Multiple RX channels
+
+There are two complete DDC and DUC DSP chains in the FPGA. In the single channel case,
+only one chain is ever used. To receive from both channels, the user must set the **RX** or **TX**
+subdevice specification.
+
+In the following example, a TVRX2 is installed.
+Channel 0 is sourced from subdevice **RX1**,
+and channel 1 is sourced from subdevice **RX2** (**RX1** and **RX2** are antenna connectors on the TVRX2 daughterboard).
+
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~{.cpp}
+usrp->set_rx_subdev_spec("A:RX1 A:RX2");
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+\subsection e3x0_misc_sensors Available Sensors
+
+The following sensors are available for the USRP-E Series motherboards;
+they can be queried through the API.
+
+- **fe_locked** - rx / tx frontend pll locked
+- **temp** - processor temperature value
+- Other sensors are added when the GPSDO is enabled
+
+*/
+// vim:ft=doxygen:
diff --git a/host/lib/convert/CMakeLists.txt b/host/lib/convert/CMakeLists.txt
index 363555f45..bec88b520 100644
--- a/host/lib/convert/CMakeLists.txt
+++ b/host/lib/convert/CMakeLists.txt
@@ -94,8 +94,11 @@ IF(CMAKE_COMPILER_IS_GNUCXX)
 ENDIF(CMAKE_COMPILER_IS_GNUCXX)
 
 IF(HAVE_ARM_NEON_H)
+    ENABLE_LANGUAGE(ASM)
+
     LIBUHD_APPEND_SOURCES(
         ${CMAKE_CURRENT_SOURCE_DIR}/convert_with_neon.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/convert_neon.S
     )
 ENDIF()
 
diff --git a/host/lib/convert/convert_neon.S b/host/lib/convert/convert_neon.S
new file mode 100644
index 000000000..8cbe82bde
--- /dev/null
+++ b/host/lib/convert/convert_neon.S
@@ -0,0 +1,37 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+	.arch armv7-a
+	.fpu neon
+	.syntax unified
+	.text
+	.align 2
+	.global neon_item32_sc16_swap_16n
+	.type neon_item32_sc16_swap_16n, %function
+neon_item32_sc16_swap_16n:
+.loop_swap:
+	vld2.16      {q0, q1}, [r0]!
+	vld2.16      {q2, q3}, [r0]!
+	vswp               q0, q1
+	vswp               q2, q3
+	vst2.16      {q0, q1}, [r1]!
+	vst2.16      {q2, q3}, [r1]!
+	subs               r2, #1
+	bne          .loop_swap
+	bx                 lr
+	.size neon_item32_sc16_swap_16n, .-neon_item32_sc16_swap_16n
+	.section .note.GNU-stack,"",%progbits
diff --git a/host/lib/convert/convert_with_neon.cpp b/host/lib/convert/convert_with_neon.cpp
index e994d97a6..f1c7773ec 100644
--- a/host/lib/convert/convert_with_neon.cpp
+++ b/host/lib/convert/convert_with_neon.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2011-2012 Ettus Research LLC
+// Copyright 2011-2014 Ettus Research LLC
 //
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -19,6 +19,12 @@
 #include <uhd/utils/byteswap.hpp>
 #include <arm_neon.h>
 
+extern "C" {
+void neon_item32_sc16_swap_16n(void *, void *, int iter);
+}
+
+static const int SIMD_WIDTH = 16;
+
 using namespace uhd::convert;
 
 DECLARE_CONVERTER(fc32, 1, sc16_item32_le, 1, PRIORITY_SIMD){
@@ -58,3 +64,31 @@ DECLARE_CONVERTER(sc16_item32_le, 1, fc32, 1, PRIORITY_SIMD){
 
     item32_sc16_to_xx<uhd::htowx>(input+i, output+i, nsamps-i, scale_factor);
 }
+
+DECLARE_CONVERTER(sc16, 1, sc16_item32_le, 1, PRIORITY_SIMD){
+    const sc16_t *input = reinterpret_cast<const sc16_t *>(inputs[0]);
+    item32_t *output = reinterpret_cast<item32_t *>(outputs[0]);
+
+    size_t i = nsamps / SIMD_WIDTH;
+
+    if (i)
+        neon_item32_sc16_swap_16n((void *) input, (void *) output, i);
+
+    i *= SIMD_WIDTH;
+
+    xx_to_item32_sc16<uhd::htowx>(input+i, output+i, nsamps-i, scale_factor);
+}
+
+DECLARE_CONVERTER(sc16_item32_le, 1, sc16, 1, PRIORITY_SIMD){
+    const item32_t *input = reinterpret_cast<const item32_t *>(inputs[0]);
+    sc16_t *output = reinterpret_cast<sc16_t *>(outputs[0]);
+
+    size_t i = nsamps / SIMD_WIDTH;
+
+    if (i)
+        neon_item32_sc16_swap_16n((void *) input, (void *) output, i);
+
+    i *= SIMD_WIDTH;
+
+    item32_sc16_to_xx<uhd::wtohx>(input+i, output+i, nsamps-i, scale_factor);
+}
diff --git a/host/lib/usrp/CMakeLists.txt b/host/lib/usrp/CMakeLists.txt
index c8c2e6a8d..f6788b5ef 100644
--- a/host/lib/usrp/CMakeLists.txt
+++ b/host/lib/usrp/CMakeLists.txt
@@ -37,5 +37,6 @@ INCLUDE_SUBDIRECTORY(usrp1)
 INCLUDE_SUBDIRECTORY(usrp2)
 INCLUDE_SUBDIRECTORY(b100)
 INCLUDE_SUBDIRECTORY(e100)
+INCLUDE_SUBDIRECTORY(e300)
 INCLUDE_SUBDIRECTORY(x300)
 INCLUDE_SUBDIRECTORY(b200)
diff --git a/host/lib/usrp/dboard/CMakeLists.txt b/host/lib/usrp/dboard/CMakeLists.txt
index 9e8653608..3c5bb4fa8 100644
--- a/host/lib/usrp/dboard/CMakeLists.txt
+++ b/host/lib/usrp/dboard/CMakeLists.txt
@@ -37,5 +37,6 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_CURRENT_SOURCE_DIR}/db_tvrx.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/db_dbsrx2.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/db_tvrx2.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/db_e3x0.cpp
 )
 
diff --git a/host/lib/usrp/dboard/db_e3x0.cpp b/host/lib/usrp/dboard/db_e3x0.cpp
new file mode 100644
index 000000000..523927d49
--- /dev/null
+++ b/host/lib/usrp/dboard/db_e3x0.cpp
@@ -0,0 +1,64 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include <uhd/utils/static.hpp>
+#include <uhd/usrp/dboard_base.hpp>
+#include <uhd/usrp/dboard_manager.hpp>
+
+namespace uhd { namespace usrp {
+
+/***********************************************************************
+ * The E310 dboard
+ *   AD9361 Interface, thus two subdevs
+ **********************************************************************/
+class e310_dboard : public xcvr_dboard_base{
+public:
+    e310_dboard(ctor_args_t args) : xcvr_dboard_base(args) {}
+
+    ~e310_dboard(void) {}
+};
+
+/***********************************************************************
+ * The E310 dboard
+ *   AD9364 Interface, thus one subdev
+ **********************************************************************/
+class e300_dboard : public xcvr_dboard_base{
+public:
+    e300_dboard(ctor_args_t args) : xcvr_dboard_base(args) {}
+
+    ~e300_dboard(void) {}
+};
+
+/***********************************************************************
+ * Register the E310 dboards
+ **********************************************************************/
+static dboard_base::sptr make_e310_dboard(dboard_base::ctor_args_t args){
+    return dboard_base::sptr(new e310_dboard(args));
+}
+
+static dboard_base::sptr make_e300_dboard(dboard_base::ctor_args_t args){
+    return dboard_base::sptr(new e300_dboard(args));
+}
+
+}} // namespace
+
+using namespace uhd::usrp;
+
+UHD_STATIC_BLOCK(reg_e3x0_dboards){
+    dboard_manager::register_dboard(0x0110, &make_e310_dboard, "E310 MIMO XCVR");
+    dboard_manager::register_dboard(0x0100, &make_e300_dboard, "E300 SISO XCVR");
+}
diff --git a/host/lib/usrp/e300/CMakeLists.txt b/host/lib/usrp/e300/CMakeLists.txt
new file mode 100644
index 000000000..9ee9b5521
--- /dev/null
+++ b/host/lib/usrp/e300/CMakeLists.txt
@@ -0,0 +1,55 @@
+#
+# Copyright 2013-2014 Ettus Research LLC
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+########################################################################
+# This file included, use CMake directory variables
+########################################################################
+
+########################################################################
+# Conditionally configure the USRP-E300 support
+########################################################################
+find_package(UDev)
+
+LIBUHD_REGISTER_COMPONENT("E300" ENABLE_E300 OFF "ENABLE_LIBUHD" OFF)
+
+IF(ENABLE_E300)
+    LIST(APPEND E300_SOURCES
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_impl.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_io_impl.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_fifo_config.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_sysfs_hooks.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_network.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_global_regs.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_spi.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_sensor_manager.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_i2c.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_eeprom_manager.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_common.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_async_serial.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_ublox_control_impl.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/e300_remote_codec_ctrl.cpp
+    )
+    LIBUHD_APPEND_SOURCES(${E300_SOURCES})
+    IF(UDEV_FOUND)
+        INCLUDE_DIRECTORIES(${UDEV_INCLUDE_DIR})
+        LIBUHD_APPEND_LIBS(${UDEV_LIBS})
+        SET_SOURCE_FILES_PROPERTIES(
+            ${E300_SOURCES}
+            PROPERTIES COMPILE_DEFINITIONS "E300_NATIVE=1"
+        )
+    ENDIF(UDEV_FOUND)
+ENDIF(ENABLE_E300)
diff --git a/host/lib/usrp/e300/e300_async_serial.cpp b/host/lib/usrp/e300/e300_async_serial.cpp
new file mode 100644
index 000000000..cdf18f7f7
--- /dev/null
+++ b/host/lib/usrp/e300/e300_async_serial.cpp
@@ -0,0 +1,245 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "e300_async_serial.hpp"
+
+namespace uhd { namespace usrp { namespace gps {
+
+async_serial::async_serial()
+    : _io(),
+      _port(_io),
+      _background_thread(),
+      _open(false),
+      _error(false)
+{
+}
+
+async_serial::async_serial(
+        const std::string &node,
+        const size_t baud_rate,
+        boost::asio::serial_port_base::parity opt_parity,
+        boost::asio::serial_port_base::character_size opt_csize,
+        boost::asio::serial_port_base::flow_control opt_flow,
+        boost::asio::serial_port_base::stop_bits opt_stop)
+    : _io(),
+      _port(_io),
+      _background_thread(),
+      _open(false),
+      _error(false)
+{
+    open(node, baud_rate, opt_parity, opt_csize, opt_flow, opt_stop);
+}
+
+void async_serial::open(
+        const std::string &node,
+        const size_t baud_rate,
+        boost::asio::serial_port_base::parity opt_parity,
+        boost::asio::serial_port_base::character_size opt_csize,
+        boost::asio::serial_port_base::flow_control opt_flow,
+        boost::asio::serial_port_base::stop_bits opt_stop)
+{
+    if(is_open())
+        close();
+
+    _set_error_status(true);
+    _port.open(node);
+    _port.set_option(
+        boost::asio::serial_port_base::baud_rate(baud_rate));
+    _port.set_option(opt_parity);
+    _port.set_option(opt_csize);
+    _port.set_option(opt_flow);
+    _port.set_option(opt_stop);
+
+    _io.post(boost::bind(&async_serial::_do_read, this));
+
+    boost::thread t(boost::bind(&boost::asio::io_service::run, &_io));
+    _background_thread.swap(t);
+    _set_error_status(false);
+    _open=true;
+}
+
+bool async_serial::is_open() const
+{
+    return _open;
+}
+
+bool async_serial::error_status() const
+{
+    boost::lock_guard<boost::mutex> l(_error_mutex);
+    return _error;
+}
+
+void async_serial::close()
+{
+    if(!is_open())
+        return;
+
+    _open=false;
+    _io.post(boost::bind(&async_serial::_do_close, this));
+    _background_thread.join();
+    _io.reset();
+    if(error_status())
+        throw(boost::system::system_error(boost::system::error_code(),
+                "Error while closing the device"));
+}
+
+void async_serial::write(const char *data, size_t size)
+{
+    {
+        boost::lock_guard<boost::mutex> l(_write_queue_mutex);
+        _write_queue.insert(_write_queue.end(), data, data+size);
+    }
+    _io.post(boost::bind(&async_serial::_do_write, this));
+}
+
+void async_serial::write(const std::vector<char> &data)
+{
+    {
+        boost::lock_guard<boost::mutex> l(_write_queue_mutex);
+        _write_queue.insert(
+            _write_queue.end(),
+            data.begin(),
+            data.end());
+    }
+    _io.post(boost::bind(&async_serial::_do_write, this));
+}
+
+void async_serial::write_string(const std::string &s)
+{
+    {
+        boost::lock_guard<boost::mutex> l(_write_queue_mutex);
+        _write_queue.insert(
+            _write_queue.end(),
+            s.begin(),
+            s.end());
+    }
+    _io.post(boost::bind(&async_serial::_do_write, this));
+}
+
+async_serial::~async_serial()
+{
+    if(is_open()) {
+        try {
+            close();
+        } catch(...) {
+            //Don't throw from a destructor
+        }
+    }
+}
+
+void async_serial::_do_read()
+{
+    _port.async_read_some(boost::asio::buffer(
+        _read_buffer,READ_BUFFER_SIZE),
+        boost::bind(&async_serial::_read_end,
+        this,
+        boost::asio::placeholders::error,
+        boost::asio::placeholders::bytes_transferred));
+}
+
+void async_serial::_read_end(
+    const boost::system::error_code& error,
+    size_t bytes_transferred)
+{
+    if(error) {
+        if(is_open()) {
+            _do_close();
+            _set_error_status(true);
+        }
+    } else {
+        if(_callback)
+            _callback(
+                _read_buffer,
+                bytes_transferred);
+        _do_read();
+    }
+}
+
+void async_serial::_do_write()
+{
+    // if a write operation is already in progress, do nothing
+    if(_write_buffer == 0) {
+        boost::lock_guard<boost::mutex> l(_write_queue_mutex);
+        _write_buffer_size=_write_queue.size();
+        _write_buffer.reset(new char[_write_queue.size()]);
+        std::copy(_write_queue.begin(),_write_queue.end(),
+                _write_buffer.get());
+        _write_queue.clear();
+        async_write(
+            _port, boost::asio::buffer(_write_buffer.get(),
+               _write_buffer_size),
+            boost::bind(
+                &async_serial::_write_end,
+                this,
+                boost::asio::placeholders::error));
+    }
+}
+
+void async_serial::_write_end(const boost::system::error_code& error)
+{
+    if(!error) {
+        boost::lock_guard<boost::mutex> l(_write_queue_mutex);
+        if(_write_queue.empty()) {
+            _write_buffer.reset();
+            _write_buffer_size=0;
+            return;
+        }
+        _write_buffer_size = _write_queue.size();
+        _write_buffer.reset(new char[_write_queue.size()]);
+        std::copy(_write_queue.begin(),_write_queue.end(),
+             _write_buffer.get());
+        _write_queue.clear();
+        async_write(
+            _port,
+            boost::asio::buffer(_write_buffer.get(),
+            _write_buffer_size),
+            boost::bind(
+               &async_serial::_write_end,
+               this,
+               boost::asio::placeholders::error));
+    } else {
+        _set_error_status(true);
+        _do_close();
+    }
+}
+
+void async_serial::_do_close()
+{
+    boost::system::error_code ec;
+    _port.cancel(ec);
+    if(ec)
+        _set_error_status(true);
+    _port.close(ec);
+    if(ec)
+        _set_error_status(true);
+}
+
+void async_serial::_set_error_status(const bool e)
+{
+    boost::lock_guard<boost::mutex> l(_error_mutex);
+    _error = e;
+}
+
+
+void async_serial::set_read_callback(
+    const boost::function<void (const char*, size_t)> &callback)
+{
+    _callback = callback;
+}
+
+
+}}} // namespace
diff --git a/host/lib/usrp/e300/e300_async_serial.hpp b/host/lib/usrp/e300/e300_async_serial.hpp
new file mode 100644
index 000000000..fafc7de3d
--- /dev/null
+++ b/host/lib/usrp/e300/e300_async_serial.hpp
@@ -0,0 +1,113 @@
+//
+// Copyright 2013-2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_ASYNC_SERIAL_HPP
+#define INCLUDED_ASYNC_SERIAL_HPP
+
+#include <boost/asio.hpp>
+#include <boost/bind.hpp>
+#include <boost/thread.hpp>
+#include <boost/utility.hpp>
+#include <boost/function.hpp>
+#include <boost/shared_array.hpp>
+
+namespace uhd { namespace usrp { namespace gps {
+
+class async_serial : private boost::noncopyable
+{
+public:
+    async_serial();
+    ~async_serial();
+
+    async_serial(const std::string &node, const size_t baud_rate,
+        boost::asio::serial_port_base::parity opt_parity=
+            boost::asio::serial_port_base::parity(
+                boost::asio::serial_port_base::parity::none),
+        boost::asio::serial_port_base::character_size opt_csize=
+            boost::asio::serial_port_base::character_size(8),
+        boost::asio::serial_port_base::flow_control opt_flow=
+            boost::asio::serial_port_base::flow_control(
+                boost::asio::serial_port_base::flow_control::none),
+        boost::asio::serial_port_base::stop_bits opt_stop=
+            boost::asio::serial_port_base::stop_bits(
+                boost::asio::serial_port_base::stop_bits::one));
+
+   void open(const std::string& node, const size_t baud_rate,
+        boost::asio::serial_port_base::parity opt_parity=
+            boost::asio::serial_port_base::parity(
+                boost::asio::serial_port_base::parity::none),
+        boost::asio::serial_port_base::character_size opt_csize=
+            boost::asio::serial_port_base::character_size(8),
+        boost::asio::serial_port_base::flow_control opt_flow=
+            boost::asio::serial_port_base::flow_control(
+                boost::asio::serial_port_base::flow_control::none),
+        boost::asio::serial_port_base::stop_bits opt_stop=
+            boost::asio::serial_port_base::stop_bits(
+                boost::asio::serial_port_base::stop_bits::one));
+
+   bool is_open(void) const;
+
+   bool error_status(void) const;
+
+   void close(void);
+
+   void write(const char *data, const size_t size);
+   void write(const std::vector<char> &data);
+
+   void write_string(const std::string &s);
+
+   static const size_t READ_BUFFER_SIZE=512;
+
+   void set_read_callback(
+       const boost::function<void (const char*, size_t)>& callback);
+
+   void clear_callback();
+
+private: // methods
+   void _do_read();
+
+   void _read_end(
+       const boost::system::error_code &error,
+       size_t bytes_transferred);
+
+   void _do_write();
+
+   void _write_end(const boost::system::error_code &error);
+
+   void _do_close();
+
+   void _set_error_status(const bool e);
+private: // members
+    boost::asio::io_service         _io;
+    boost::asio::serial_port        _port;
+    boost::thread                   _background_thread;
+    bool                            _open;
+    bool                            _error;
+    mutable boost::mutex            _error_mutex;
+
+    std::vector<char>              _write_queue;
+    boost::shared_array<char>      _write_buffer;
+    size_t                         _write_buffer_size;
+    boost::mutex                   _write_queue_mutex;
+    char                           _read_buffer[READ_BUFFER_SIZE];
+
+    boost::function<void (const char*, size_t)> _callback;
+};
+
+}}} // namespace
+
+#endif //INCLUDED_ASYNC_SERIAL_HPP
diff --git a/host/lib/usrp/e300/e300_common.cpp b/host/lib/usrp/e300/e300_common.cpp
new file mode 100644
index 000000000..97e906be7
--- /dev/null
+++ b/host/lib/usrp/e300/e300_common.cpp
@@ -0,0 +1,59 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+#include <uhd/utils/msg.hpp>
+
+#include "e300_fifo_config.hpp"
+#include "e300_fifo_config.hpp"
+
+#include "e300_common.hpp"
+
+#include <boost/filesystem.hpp>
+#include <fstream>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+namespace common {
+
+void load_fpga_image(const std::string &path)
+{
+    if (not boost::filesystem::exists("/dev/xdevcfg"))
+        ::system("mknod /dev/xdevcfg c 259 0");
+
+    UHD_MSG(status) << "Loading FPGA image: " << path << "..." << std::flush;
+
+    std::ifstream fpga_file(path.c_str(), std::ios_base::binary);
+    UHD_ASSERT_THROW(fpga_file.good());
+
+    std::FILE *wfile;
+    wfile = std::fopen("/dev/xdevcfg", "wb");
+    UHD_ASSERT_THROW(!(wfile == NULL));
+
+    char buff[16384]; // devcfg driver can't handle huge writes
+    do {
+        fpga_file.read(buff, sizeof(buff));
+        std::fwrite(buff, 1, fpga_file.gcount(), wfile);
+    } while (fpga_file);
+
+    fpga_file.close();
+    std::fclose(wfile);
+
+    UHD_MSG(status) << " done" << std::endl;
+}
+
+}
+
+}}}
diff --git a/host/lib/usrp/e300/e300_common.hpp b/host/lib/usrp/e300/e300_common.hpp
new file mode 100644
index 000000000..d9a0afd9e
--- /dev/null
+++ b/host/lib/usrp/e300/e300_common.hpp
@@ -0,0 +1,31 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_COMMON_HPP
+#define INCLUDED_E300_COMMON_HPP
+
+namespace uhd { namespace usrp { namespace e300 {
+
+namespace common {
+
+void load_fpga_image(const std::string &path);
+
+};
+
+}}}
+
+#endif // INCLUDED_E300_COMMON_HPP
diff --git a/host/lib/usrp/e300/e300_defaults.hpp b/host/lib/usrp/e300/e300_defaults.hpp
new file mode 100644
index 000000000..9c0e5df1d
--- /dev/null
+++ b/host/lib/usrp/e300/e300_defaults.hpp
@@ -0,0 +1,82 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_DEFAULTS_HPP
+#define INCLUDED_E300_DEFAULTS_HPP
+
+#include "ad9361_client.h"
+
+namespace uhd { namespace usrp { namespace e300 {
+
+static const double DEFAULT_TICK_RATE       = 32e6;
+static const double MAX_TICK_RATE           = 50e6;
+static const double MIN_TICK_RATE           = 1e6;
+
+static const double DEFAULT_TX_SAMP_RATE    = 1.0e6;
+static const double DEFAULT_RX_SAMP_RATE    = 1.0e6;
+static const double DEFAULT_DDC_FREQ        = 0.0;
+static const double DEFAULT_DUC_FREQ        = 0.0;
+
+static const double DEFAULT_FE_GAIN         = 0.0;
+static const double DEFAULT_FE_FREQ         = 1.0e9;
+static const double DEFAULT_FE_BW           = 56e6;
+
+static const std::string DEFAULT_TIME_SRC   = "none";
+static const std::string DEFAULT_CLOCK_SRC  = "internal";
+
+static const size_t DEFAULT_RX_DATA_FRAME_SIZE = 4096;
+static const size_t DEFAULT_RX_DATA_NUM_FRAMES = 32;
+
+static const size_t DEFAULT_TX_DATA_FRAME_SIZE = 2048;
+static const size_t DEFAULT_TX_DATA_NUM_FRAMES = 32;
+
+static const size_t DEFAULT_CTRL_FRAME_SIZE    = 64;
+static const size_t DEFAULT_CTRL_NUM_FRAMES    = 32;
+
+static const size_t MAX_NET_RX_DATA_FRAME_SIZE = 1200;
+static const size_t MAX_NET_TX_DATA_FRAME_SIZE = 1200;
+
+class e300_ad9361_client_t : public ad9361_params {
+public:
+    ~e300_ad9361_client_t() {}
+    double get_band_edge(frequency_band_t band) {
+        switch (band) {
+        case AD9361_RX_BAND0:   return 1.2e9;
+        case AD9361_RX_BAND1:   return 2.6e9;
+        case AD9361_TX_BAND0:   return 2940.0e6;
+        default:                return 0;
+        }
+    }
+    clocking_mode_t get_clocking_mode() {
+        return AD9361_XTAL_N_CLK_PATH;
+    }
+    digital_interface_mode_t get_digital_interface_mode() {
+        return AD9361_DDR_FDD_LVCMOS;
+    }
+    digital_interface_delays_t get_digital_interface_timing() {
+        digital_interface_delays_t delays;
+        delays.rx_clk_delay = 0;
+        delays.rx_data_delay = 0xF;
+        delays.tx_clk_delay = 0;
+        delays.tx_data_delay = 0xF;
+        return delays;
+    }
+};
+
+}}} // namespace
+
+#endif // INCLUDED_E300_DEFAULTS_HPP
diff --git a/host/lib/usrp/e300/e300_eeprom_manager.cpp b/host/lib/usrp/e300/e300_eeprom_manager.cpp
new file mode 100644
index 000000000..af1235b6b
--- /dev/null
+++ b/host/lib/usrp/e300/e300_eeprom_manager.cpp
@@ -0,0 +1,236 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "e300_eeprom_manager.hpp"
+#include <uhd/types/mac_addr.hpp>
+#include <uhd/utils/byteswap.hpp>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+static const std::string _bytes_to_string(const uint8_t* bytes, size_t max_len)
+{
+    std::string out;
+    for (size_t i = 0; i < max_len; i++) {
+        if (bytes[i] < 32 or bytes[i] > 127) return out;
+        out += bytes[i];
+    }
+    return out;
+}
+
+static void _string_to_bytes(const std::string &string, size_t max_len, uint8_t* buffer)
+{
+    byte_vector_t bytes;
+    const size_t len = std::min(string.size(), max_len);
+    for (size_t i = 0; i < len; i++){
+        buffer[i] = string[i];
+    }
+    if (len < max_len - 1)
+        buffer[len] = '\0';
+}
+
+e300_eeprom_manager::e300_eeprom_manager(i2c::sptr i2c) : _i2c(i2c)
+{
+    read_mb_eeprom();
+    read_db_eeprom();
+}
+
+e300_eeprom_manager::~e300_eeprom_manager(void)
+{
+}
+
+const mboard_eeprom_t& e300_eeprom_manager::read_mb_eeprom(void)
+{
+    boost::mutex::scoped_lock(_mutex);
+
+    std::vector<boost::uint8_t> bytes;
+    bytes.resize(sizeof(mb_eeprom_map_t));
+    mb_eeprom_map_t *map_ptr = reinterpret_cast<mb_eeprom_map_t*>(&bytes[0]);
+    memset(map_ptr, 0xff, sizeof(mb_eeprom_map_t));
+
+    // get the old contents
+    for(size_t i = 0; i < sizeof(mb_eeprom_map_t); i++)
+        bytes[i] = _i2c->get_i2c_reg8(MB_ADDR, i);
+
+    mb_eeprom_map_t &map = *map_ptr;
+
+    _mb_eeprom["product"] = boost::lexical_cast<std::string>(
+        uhd::ntohx<boost::uint16_t>(map.hw_product));
+    _mb_eeprom["revision"] = boost::lexical_cast<std::string>(
+        uhd::ntohx<boost::uint16_t>(map.hw_revision));
+    _mb_eeprom["serial"] = _bytes_to_string(
+        map.serial, MB_SERIAL_LEN);
+
+    byte_vector_t mac_addr(map.mac_addr, map.mac_addr + 6);
+    _mb_eeprom["mac-addr"] = mac_addr_t::from_bytes(mac_addr).to_string();
+
+    _mb_eeprom["name"] = _bytes_to_string(
+        map.user_name, MB_NAME_LEN);
+
+    return _mb_eeprom;
+}
+
+const dboard_eeprom_t& e300_eeprom_manager::read_db_eeprom(void)
+{
+    boost::mutex::scoped_lock(_mutex);
+
+    std::vector<boost::uint8_t> bytes;
+    bytes.resize(sizeof(db_eeprom_map_t));
+    db_eeprom_map_t *map_ptr = reinterpret_cast<db_eeprom_map_t*>(&bytes[0]);
+    memset(map_ptr, 0xff, sizeof(db_eeprom_map_t));
+
+    // get the old contents
+    for(size_t i = 0; i < sizeof(db_eeprom_map_t); i++)
+        bytes[i] = _i2c->get_i2c_reg16(DB_ADDR, i);
+
+    db_eeprom_map_t &map = *map_ptr;
+
+    _db_eeprom.id = uhd::usrp::dboard_id_t::from_uint16(
+        uhd::ntohx<boost::uint16_t>(map.hw_product));
+
+    _db_eeprom.revision = boost::lexical_cast<std::string>(
+        uhd::ntohx<boost::uint16_t>(map.hw_revision));
+    _db_eeprom.serial = _bytes_to_string(
+        map.serial, DB_SERIAL_LEN);
+
+    return _db_eeprom;
+}
+
+void e300_eeprom_manager::write_db_eeprom(const dboard_eeprom_t& eeprom)
+{
+    boost::mutex::scoped_lock(_mutex);
+    _db_eeprom = eeprom;
+    std::vector<boost::uint8_t> bytes;
+    bytes.resize(sizeof(db_eeprom_map_t));
+
+
+    db_eeprom_map_t *map_ptr = reinterpret_cast<db_eeprom_map_t*>(&bytes[0]);
+    memset(map_ptr, 0xff, sizeof(db_eeprom_map_t));
+
+    // get the old contents
+    for(size_t i = 0; i < sizeof(db_eeprom_map_t); i++)
+        bytes[i] = _i2c->get_i2c_reg16(DB_ADDR, i);
+
+    db_eeprom_map_t &map = *map_ptr;
+
+    if (_db_eeprom.id != dboard_id_t::none()) {
+        map.hw_product = uhd::htonx<boost::uint16_t>(
+            _db_eeprom.id.to_uint16());
+    }
+
+    if (not _db_eeprom.revision.empty()) {
+        map.hw_revision = uhd::htonx<boost::uint16_t>(
+            boost::lexical_cast<boost::uint16_t>(_db_eeprom.revision));
+    }
+
+    if (not _db_eeprom.serial.empty()) {
+        _string_to_bytes(_db_eeprom.serial, DB_SERIAL_LEN, map.serial);
+    }
+    for(size_t i = 0; i < sizeof(mb_eeprom_map_t); i++)
+        _i2c->set_i2c_reg16(DB_ADDR, i, bytes[i]);
+}
+
+void e300_eeprom_manager::write_mb_eeprom(const mboard_eeprom_t& eeprom)
+{
+    boost::mutex::scoped_lock(_mutex);
+    _mb_eeprom = eeprom;
+    std::vector<boost::uint8_t> bytes;
+    bytes.resize(sizeof(mb_eeprom_map_t));
+
+
+    mb_eeprom_map_t *map_ptr = reinterpret_cast<mb_eeprom_map_t*>(&bytes[0]);
+    memset(map_ptr, 0xff, sizeof(mb_eeprom_map_t));
+
+    // get the old contents
+    for(size_t i = 0; i < sizeof(mb_eeprom_map_t); i++)
+        bytes[i] = _i2c->get_i2c_reg8(MB_ADDR, i);
+
+    mb_eeprom_map_t &map = *map_ptr;
+
+    if (_mb_eeprom.has_key("product")) {
+        map.hw_product = uhd::htonx<boost::uint16_t>(
+            boost::lexical_cast<boost::uint16_t>(_mb_eeprom["product"]));
+    }
+    if (_mb_eeprom.has_key("revision")) {
+        map.hw_revision = uhd::htonx<boost::uint16_t>(
+            boost::lexical_cast<boost::uint16_t>(_mb_eeprom["revision"]));
+    }
+    if (_mb_eeprom.has_key("serial")) {
+        _string_to_bytes(_mb_eeprom["serial"], MB_SERIAL_LEN, map.serial);
+    }
+    if (_mb_eeprom.has_key("mac-addr")) {
+        byte_vector_t mac_addr = mac_addr_t::from_string(_mb_eeprom["mac-addr"]).to_bytes();
+        std::copy(mac_addr.begin(), mac_addr.end(), map.mac_addr);
+    }
+
+    //store the name
+    if (_mb_eeprom.has_key("name")) {
+        _string_to_bytes(_mb_eeprom["name"], MB_NAME_LEN, map.user_name);
+    }
+
+    for(size_t i = 0; i < sizeof(mb_eeprom_map_t); i++)
+        _i2c->set_i2c_reg8(MB_ADDR, i, bytes[i]);
+
+}
+
+e300_eeprom_manager::mboard_t e300_eeprom_manager::get_mb_type(void) const
+{
+    boost::mutex::scoped_lock(_mutex);
+    boost::uint16_t pid = boost::lexical_cast<boost::uint16_t>(
+        _mb_eeprom["product"]);
+    return get_mb_type(pid);
+}
+
+e300_eeprom_manager::mboard_t e300_eeprom_manager::get_mb_type(
+    boost::uint16_t pid)
+{
+    switch (pid) {
+    case E300_MB_PID:
+        return USRP_E300_MB;
+
+    case E310_MB_PID:
+        return USRP_E310_MB;
+
+    default:
+        return UNKNOWN;
+    };
+}
+
+
+std::string e300_eeprom_manager::get_mb_type_string(void) const
+{
+    boost::mutex::scoped_lock(_mutex);
+    boost::uint16_t product = boost::lexical_cast<boost::uint16_t>(
+        _mb_eeprom["product"]);
+    switch (product) {
+    case E300_MB_PID:
+        return "E300";
+
+    case E310_MB_PID:
+        return "E310";
+
+    default:
+        return "UNKNOWN";
+    };
+}
+
+i2c::sptr e300_eeprom_manager::get_i2c_sptr(void)
+{
+    return _i2c;
+}
+
+
+}}} // namespace
diff --git a/host/lib/usrp/e300/e300_eeprom_manager.hpp b/host/lib/usrp/e300/e300_eeprom_manager.hpp
new file mode 100644
index 000000000..e77f25ed5
--- /dev/null
+++ b/host/lib/usrp/e300/e300_eeprom_manager.hpp
@@ -0,0 +1,125 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_EEPROM_MANAGER_HPP
+#define INCLUDED_E300_EEPROM_MANAGER_HPP
+
+#include <boost/thread/mutex.hpp>
+#include <boost/shared_ptr.hpp>
+#include <uhd/types/dict.hpp>
+#include <uhd/usrp/mboard_eeprom.hpp>
+#include <uhd/usrp/dboard_eeprom.hpp>
+
+#include "e300_i2c.hpp"
+
+namespace uhd { namespace usrp { namespace e300 {
+
+static const boost::uint16_t E300_MB_PID = 0x77d1;
+static const boost::uint16_t E310_MB_PID = 0x77d2;
+
+static const boost::uint16_t E300_DB_PID = 0x0100;
+static const boost::uint16_t E310_DB_PID = 0x0110;
+
+class e300_eeprom_manager : boost::noncopyable
+{
+public:
+    typedef boost::shared_ptr<e300_eeprom_manager> sptr;
+    e300_eeprom_manager(i2c::sptr i2c);
+    ~e300_eeprom_manager();
+
+    // mboard
+    const mboard_eeprom_t& read_mb_eeprom();
+    void write_mb_eeprom(const mboard_eeprom_t& eeprom);
+
+    UHD_INLINE const mboard_eeprom_t& get_mb_eeprom()
+    {
+        return _mb_eeprom;
+    }
+
+    // dboard
+    const dboard_eeprom_t& read_db_eeprom();
+    void write_db_eeprom(const dboard_eeprom_t& eeprom);
+
+    UHD_INLINE const dboard_eeprom_t& get_db_eeprom()
+    {
+        return _db_eeprom;
+    }
+
+
+    i2c::sptr get_i2c_sptr(void);
+
+    enum mboard_t {USRP_E300_MB, USRP_E310_MB, UNKNOWN};
+
+    mboard_t get_mb_type(void) const;
+    static mboard_t get_mb_type(boost::uint16_t pid);
+    std::string get_mb_type_string(void) const;
+
+private: // types
+    const static size_t MB_SERIAL_LEN = 6;
+    const static size_t MB_NAME_LEN   = 32;
+    const static size_t MB_ADDR       = 0x51;
+
+    const static size_t DB_SERIAL_LEN = 6;
+    const static size_t DB_ADDR       = 0x50;
+
+    struct mb_eeprom_map_t
+    {
+        // Data format version
+        boost::uint16_t data_version_major;
+        boost::uint16_t data_version_minor;
+
+        // NIC mac address
+        boost::uint8_t mac_addr[6];
+
+        // HW identification info
+        boost::uint16_t hw_product;
+        boost::uint16_t hw_revision;
+
+        // serial
+        boost::uint8_t serial[MB_SERIAL_LEN];
+        boost::uint8_t pad[20 - MB_SERIAL_LEN];
+
+        //User specific
+        boost::uint8_t user_name[MB_NAME_LEN];
+    };
+
+    struct db_eeprom_map_t
+    {
+        // Data format version
+        boost::uint16_t data_version_major;
+        boost::uint16_t data_version_minor;
+
+        // HW identification info
+        boost::uint16_t hw_product;
+        boost::uint16_t hw_revision;
+
+        // serial
+        boost::uint8_t serial[MB_SERIAL_LEN];
+        boost::uint8_t pad[20 - MB_SERIAL_LEN];
+    };
+
+private: // members
+    mboard_eeprom_t                         _mb_eeprom;
+    dboard_eeprom_t                         _db_eeprom;
+    i2c::sptr                               _i2c;
+
+    boost::mutex    _mutex;
+};
+
+}}} //namespace
+
+#endif // INCLUDED_E300_EEPROM_MANAGER_HPP
diff --git a/host/lib/usrp/e300/e300_fifo_config.cpp b/host/lib/usrp/e300/e300_fifo_config.cpp
new file mode 100644
index 000000000..ac4ace7f2
--- /dev/null
+++ b/host/lib/usrp/e300/e300_fifo_config.cpp
@@ -0,0 +1,429 @@
+//
+// Copyright 2013-2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifdef E300_NATIVE
+
+#include <boost/cstdint.hpp>
+#include <uhd/config.hpp>
+
+// constants coded into the fpga parameters
+static const size_t ZF_CONFIG_BASE    = 0x40000000;
+static const size_t ZF_PAGE_WIDTH     = 10;
+static const size_t H2S_STREAMS_WIDTH = 4;
+static const size_t H2S_CMDFIFO_DEPTH = 5;
+static const size_t S2H_STREAMS_WIDTH = 4;
+static const size_t S2H_CMDFIFO_DEPTH = 5;
+
+// calculate more useful constants for this module
+static const size_t ZF_PAGE_SIZE(1 << ZF_PAGE_WIDTH);
+static const size_t H2S_NUM_STREAMS(1 << H2S_STREAMS_WIDTH);
+static const size_t H2S_NUM_CMDS(1 << H2S_CMDFIFO_DEPTH);
+static const size_t S2H_NUM_STREAMS(1 << S2H_STREAMS_WIDTH);
+static const size_t S2H_NUM_CMDS(1 << S2H_CMDFIFO_DEPTH);
+
+//offsetsinto the arbiter memory map
+static const size_t ARBITER_WR_CLEAR      = 0;
+static const size_t ARBITER_RD_SIG        = 0;
+static const size_t ARBITER_WR_ADDR       = 4;
+static const size_t ARBITER_WR_SIZE       = 8;
+static const size_t ARBITER_WR_STS_RDY    = 12;
+static const size_t ARBITER_WR_STS        = 16;
+static const size_t ARBITER_RB_STATUS     = 16;
+static const size_t ARBITER_RB_STATUS_OCC = 20;
+static const size_t ARBITER_RB_ADDR_SPACE = 24;
+static const size_t ARBITER_RB_SIZE_SPACE = 28;
+
+// registers for the wb32_iface
+static const size_t SR_CORE_READBACK = 0;
+
+
+static UHD_INLINE size_t S2H_BASE(const size_t base)
+{
+    return base + ZF_PAGE_SIZE * 0;
+}
+
+static UHD_INLINE size_t H2S_BASE(const size_t base)
+{
+    return base + ZF_PAGE_SIZE * 1;
+}
+
+static UHD_INLINE size_t REG_BASE(const size_t base)
+{
+    return base + ZF_PAGE_SIZE * 2;
+}
+
+static UHD_INLINE size_t DST_BASE(const size_t base)
+{
+    return base + ZF_PAGE_SIZE * 3;
+}
+
+static UHD_INLINE size_t ZF_STREAM_OFF(const size_t which)
+{
+    return which * 32;
+}
+
+#include "e300_fifo_config.hpp"
+#include <sys/mman.h> //mmap
+#include <fcntl.h> //open, close
+#include <poll.h> //poll
+#include <uhd/utils/log.hpp>
+#include <uhd/utils/msg.hpp>
+#include <boost/format.hpp>
+#include <boost/thread/thread.hpp> //sleep
+#include <uhd/types/time_spec.hpp> //timeout
+#include <uhd/utils/log.hpp>
+#include <uhd/utils/atomic.hpp>
+
+//locking stuff for shared irq
+#include <boost/thread/mutex.hpp>
+#include <boost/thread/condition_variable.hpp>
+
+struct e300_fifo_poll_waiter
+{
+    e300_fifo_poll_waiter(const int fd):
+        fd(fd)
+    {
+        //NOP
+    }
+
+    void wait(const double timeout)
+    {
+        if (_poll_claimed.cas(1, 0))
+        {
+            boost::mutex::scoped_lock l(mutex);
+            cond.wait(l);
+        }
+        else
+        {
+            struct pollfd fds[1];
+            fds[0].fd = fd;
+            fds[0].events = POLLIN;
+            ::poll(fds, 1, long(timeout*1000));
+            if (fds[0].revents & POLLIN)
+                ::read(fd, NULL, 0);
+
+            _poll_claimed.write(0);
+            cond.notify_all();
+        }
+    }
+
+    uhd::atomic_uint32_t _poll_claimed;
+    boost::condition_variable cond;
+    boost::mutex mutex;
+    int fd;
+};
+
+static const size_t DEFAULT_FRAME_SIZE = 2048;
+static const size_t DEFAULT_NUM_FRAMES = 32;
+
+using namespace uhd;
+using namespace uhd::transport;
+
+struct __mem_addrz_t
+{
+    size_t which, phys, data, ctrl;
+};
+
+/***********************************************************************
+ * peek n' poke mmapped space
+ **********************************************************************/
+UHD_INLINE void zf_poke32(const boost::uint32_t addr, const boost::uint32_t data)
+{
+    volatile boost::uint32_t *p = reinterpret_cast<boost::uint32_t *>(addr);
+    *p = data;
+}
+
+UHD_INLINE boost::uint32_t zf_peek32(const boost::uint32_t addr)
+{
+    volatile const boost::uint32_t *p = reinterpret_cast<const boost::uint32_t *>(addr);
+    return *p;
+}
+
+/***********************************************************************
+ * managed buffer
+ **********************************************************************/
+struct e300_fifo_mb : managed_buffer
+{
+    e300_fifo_mb(const __mem_addrz_t &addrs, const size_t len):
+        ctrl_base(addrs.ctrl), phys_mem(addrs.phys), mem((void *)addrs.data), len(len){}
+
+    void release(void)
+    {
+        UHD_ASSERT_THROW(zf_peek32(ctrl_base+ARBITER_RB_ADDR_SPACE) > 0);
+        UHD_ASSERT_THROW(zf_peek32(ctrl_base+ARBITER_RB_SIZE_SPACE) > 0);
+        zf_poke32(ctrl_base + ARBITER_WR_ADDR, phys_mem);
+        zf_poke32(ctrl_base + ARBITER_WR_SIZE, this->size());
+    }
+
+    template <typename T>
+    UHD_INLINE typename T::sptr get_new(void)
+    {
+        return make(reinterpret_cast<T *>(this), mem, len);
+    }
+
+    const size_t ctrl_base;
+    const size_t phys_mem;
+    void *const mem;
+    const size_t len;
+};
+
+/***********************************************************************
+ * transport
+ **********************************************************************/
+class e300_transport : public zero_copy_if
+{
+public:
+    e300_transport(
+        boost::shared_ptr<void> allocator,
+        const __mem_addrz_t &addrs,
+        const size_t num_frames,
+        const size_t frame_size,
+        e300_fifo_poll_waiter *waiter,
+        const bool auto_release
+    ):
+        _allocator(allocator),
+        _addrs(addrs),
+        _num_frames(num_frames),
+        _frame_size(frame_size),
+        _index(0),
+        _waiter(waiter)
+    {
+        //UHD_MSG(status) << boost::format("phys 0x%x") % addrs.phys << std::endl;
+        //UHD_MSG(status) << boost::format("data 0x%x") % addrs.data << std::endl;
+        //UHD_MSG(status) << boost::format("ctrl 0x%x") % addrs.ctrl << std::endl;
+
+        const boost::uint32_t sig = zf_peek32(_addrs.ctrl + ARBITER_RD_SIG);
+        UHD_ASSERT_THROW((sig >> 16) == 0xACE0);
+
+        zf_poke32(_addrs.ctrl + ARBITER_WR_CLEAR, 1);
+        for (size_t i = 0; i < num_frames; i++)
+        {
+            //create a managed buffer at the given offset
+            __mem_addrz_t mb_addrs = addrs;
+            mb_addrs.phys += (i*frame_size);
+            mb_addrs.data += (i*frame_size);
+            boost::shared_ptr<e300_fifo_mb> mb(new e300_fifo_mb(mb_addrs, frame_size));
+
+            //setup the buffers so they are "positioned for use"
+            const size_t sts_good = (1 << 7) | (_addrs.which & 0xf);
+            if (auto_release) mb->get_new<managed_recv_buffer>(); //release for read
+            else zf_poke32(_addrs.ctrl + ARBITER_WR_STS, sts_good); //poke an ok into the sts fifo
+
+            _buffs.push_back(mb);
+        }
+    }
+
+    ~e300_transport(void)
+    {
+        //NOP
+    }
+
+    template <typename T>
+    UHD_INLINE typename T::sptr get_buff(const double timeout)
+    {
+        const time_spec_t exit_time = time_spec_t::get_system_time() + time_spec_t(timeout);
+        do
+        {
+            if (zf_peek32(_addrs.ctrl + ARBITER_RB_STATUS_OCC))
+            {
+                const boost::uint32_t sts = zf_peek32(_addrs.ctrl + ARBITER_RB_STATUS);
+                UHD_ASSERT_THROW((sts >> 7) & 0x1); //assert OK
+                UHD_ASSERT_THROW((sts & 0xf) == _addrs.which); //expected tag
+                zf_poke32(_addrs.ctrl + ARBITER_WR_STS_RDY, 1); //pop from sts fifo
+                if (_index == _num_frames)
+                    _index = 0;
+                return _buffs[_index++]->get_new<T>();
+            }
+            _waiter->wait(timeout);
+            //boost::this_thread::sleep(boost::posix_time::milliseconds(1));
+        }
+        while (time_spec_t::get_system_time() < exit_time);
+
+        return typename T::sptr();
+    }
+
+    managed_recv_buffer::sptr get_recv_buff(const double timeout)
+    {
+        return this->get_buff<managed_recv_buffer>(timeout);
+    }
+
+    size_t get_num_recv_frames(void) const
+    {
+        return _num_frames;
+    }
+
+    size_t get_recv_frame_size(void) const
+    {
+        return _frame_size;
+    }
+
+    managed_send_buffer::sptr get_send_buff(const double timeout)
+    {
+        return this->get_buff<managed_send_buffer>(timeout);
+    }
+
+    size_t get_num_send_frames(void) const
+    {
+        return _num_frames;
+    }
+
+    size_t get_send_frame_size(void) const
+    {
+        return _frame_size;
+    }
+
+private:
+    boost::shared_ptr<void> _allocator;
+    const __mem_addrz_t _addrs;
+    const size_t _num_frames;
+    const size_t _frame_size;
+    size_t _index;
+    e300_fifo_poll_waiter *_waiter;
+    std::vector<boost::shared_ptr<e300_fifo_mb> > _buffs;
+};
+
+/***********************************************************************
+ * memory mapping
+ **********************************************************************/
+class e300_fifo_interface_impl : public virtual e300_fifo_interface
+{
+public:
+    e300_fifo_interface_impl(const e300_fifo_config_t &config):
+        _config(config),
+        _bytes_in_use(0),
+        _recv_entries_in_use(std::vector<size_t>(S2H_NUM_STREAMS, 0)),
+        _send_entries_in_use(std::vector<size_t>(H2S_NUM_STREAMS, 0))
+    {
+        //open the file descriptor to our kernel module
+        const std::string dev = "/dev/axi_fpga";
+        _fd = ::open(dev.c_str(), O_RDWR|O_SYNC);
+        if (_fd < 0)
+        {
+            throw uhd::runtime_error("e300: failed to open " + dev);
+        }
+
+        //mmap the control and data regions into virtual space
+        //UHD_VAR(_config.ctrl_length);
+        //UHD_VAR(_config.buff_length);
+        //UHD_VAR(_config.phys_addr);
+        _buff = ::mmap(NULL, _config.ctrl_length + _config.buff_length, PROT_READ|PROT_WRITE, MAP_SHARED, _fd, 0);
+        if (_buff == MAP_FAILED)
+        {
+            ::close(_fd);
+            throw uhd::runtime_error("e300: failed to mmap " + dev);
+        }
+
+        //segment the memory according to zynq fifo arbiter
+        _ctrl_space = size_t(_buff);
+        _data_space = size_t(_buff) + _config.ctrl_length;
+
+        //zero out the data region
+        std::memset((void *)_data_space, 0, _config.buff_length);
+
+        //create a poll _waiter for the transports
+        _waiter = new e300_fifo_poll_waiter(_fd);
+    }
+
+    virtual ~e300_fifo_interface_impl(void)
+    {
+        delete _waiter;
+        UHD_LOG << "cleanup: munmap" << std::endl;
+        ::munmap(_buff, _config.ctrl_length + _config.buff_length);
+        ::close(_fd);
+    }
+
+    uhd::transport::zero_copy_if::sptr make_recv_xport(
+        const size_t which_stream,
+        const uhd::transport::zero_copy_xport_params &params)
+    {
+        return this->_make_xport(which_stream, params, true);
+    }
+
+    uhd::transport::zero_copy_if::sptr make_send_xport(
+        const size_t which_stream,
+        const uhd::transport::zero_copy_xport_params &params)
+    {
+        return this->_make_xport(which_stream, params, false);
+    }
+
+    size_t get_global_regs_base() const
+    {
+        return REG_BASE(_ctrl_space);
+    }
+
+private:
+    uhd::transport::zero_copy_if::sptr _make_xport(
+        const size_t which_stream,
+        const uhd::transport::zero_copy_xport_params &params,
+        const bool is_recv)
+    {
+        boost::mutex::scoped_lock lock(_setup_mutex);
+
+        const size_t frame_size = is_recv ? params.recv_frame_size : params.send_frame_size;
+        const size_t num_frames = is_recv ? params.num_recv_frames : params.num_send_frames;
+        size_t &entries_in_use = (is_recv)? _recv_entries_in_use.at(which_stream)
+                                          : _send_entries_in_use.at(which_stream);
+
+        __mem_addrz_t addrs;
+        addrs.which = which_stream;
+        addrs.phys = _config.phys_addr + _bytes_in_use;
+        addrs.data = _data_space + _bytes_in_use;
+        addrs.ctrl = ((is_recv)? S2H_BASE(_ctrl_space) : H2S_BASE(_ctrl_space)) + ZF_STREAM_OFF(which_stream);
+
+        uhd::transport::zero_copy_if::sptr xport;
+        if (is_recv) xport.reset(new e300_transport(shared_from_this(), addrs, num_frames, frame_size, _waiter, is_recv));
+        else         xport.reset(new e300_transport(shared_from_this(), addrs, num_frames, frame_size, _waiter, is_recv));
+
+        _bytes_in_use += num_frames*frame_size;
+        entries_in_use += num_frames;
+
+        UHD_ASSERT_THROW(_recv_entries_in_use.at(which_stream) <= S2H_NUM_CMDS);
+        UHD_ASSERT_THROW(_send_entries_in_use.at(which_stream) <= H2S_NUM_CMDS);
+        UHD_ASSERT_THROW(_bytes_in_use <= _config.buff_length);
+
+
+        return xport;
+    }
+
+    e300_fifo_config_t     _config;
+    e300_fifo_poll_waiter *_waiter;
+    size_t                 _bytes_in_use;
+    int                    _fd;
+    void                  *_buff;
+    size_t                 _ctrl_space;
+    size_t                 _data_space;
+    std::vector<size_t>    _recv_entries_in_use;
+    std::vector<size_t>    _send_entries_in_use;
+    boost::mutex           _setup_mutex;
+};
+
+e300_fifo_interface::sptr e300_fifo_interface::make(const e300_fifo_config_t &config)
+{
+    return e300_fifo_interface::sptr(new e300_fifo_interface_impl(config));
+}
+
+#else //E300_NATIVE
+
+#include "e300_fifo_config.hpp"
+#include <uhd/exception.hpp>
+
+e300_fifo_interface::sptr e300_fifo_interface::make(const e300_fifo_config_t &)
+{
+    throw uhd::assertion_error("e300_fifo_interface::make() !E300_NATIVE");
+}
+
+#endif //E300_NATIVE
diff --git a/host/lib/usrp/e300/e300_fifo_config.hpp b/host/lib/usrp/e300/e300_fifo_config.hpp
new file mode 100644
index 000000000..967f451ca
--- /dev/null
+++ b/host/lib/usrp/e300/e300_fifo_config.hpp
@@ -0,0 +1,52 @@
+//
+// Copyright 2013-2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_FIFO_CONFIG_HPP
+#define INCLUDED_E300_FIFO_CONFIG_HPP
+
+#include <uhd/types/device_addr.hpp>
+#include <uhd/types/wb_iface.hpp>
+#include <uhd/transport/zero_copy.hpp>
+#include <boost/enable_shared_from_this.hpp>
+
+struct e300_fifo_config_t
+{
+    size_t ctrl_length;
+    size_t buff_length;
+    size_t phys_addr;
+};
+
+e300_fifo_config_t e300_read_sysfs(void);
+std::string e300_get_sysfs_attr(const std::string &node, const std::string &attr);
+
+struct e300_fifo_interface : boost::enable_shared_from_this<e300_fifo_interface>
+{
+    typedef boost::shared_ptr<e300_fifo_interface> sptr;
+    static sptr make(const e300_fifo_config_t &config);
+
+    virtual uhd::transport::zero_copy_if::sptr make_recv_xport(
+        const size_t which_stream,
+        const uhd::transport::zero_copy_xport_params &params) = 0;
+
+    virtual uhd::transport::zero_copy_if::sptr make_send_xport(
+        const size_t which_stream,
+        const uhd::transport::zero_copy_xport_params &parms) = 0;
+
+    virtual size_t get_global_regs_base(void) const = 0;
+};
+
+#endif /* INCLUDED_E300_FIFO_CONFIG_HPP */
diff --git a/host/lib/usrp/e300/e300_fpga_defs.hpp b/host/lib/usrp/e300/e300_fpga_defs.hpp
new file mode 100644
index 000000000..d58fd63a9
--- /dev/null
+++ b/host/lib/usrp/e300/e300_fpga_defs.hpp
@@ -0,0 +1,29 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_FPGA_DEFS_HPP
+#define INCLUDED_E300_FPGA_DEFS_HPP
+namespace uhd { namespace usrp { namespace e300 { namespace fpga {
+
+static const size_t NUM_RADIOS = 2;
+
+static const boost::uint32_t COMPAT_MAJOR = 4;
+static const boost::uint32_t COMPAT_MINOR = 0;
+
+}}}} // namespace
+
+#endif // INCLUDED_E300_FPGA_DEFS_HPP
diff --git a/host/lib/usrp/e300/e300_global_regs.cpp b/host/lib/usrp/e300/e300_global_regs.cpp
new file mode 100644
index 000000000..3ba895826
--- /dev/null
+++ b/host/lib/usrp/e300/e300_global_regs.cpp
@@ -0,0 +1,131 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "e300_global_regs.hpp"
+
+#include <boost/cstdint.hpp>
+#include <uhd/exception.hpp>
+#include <uhd/utils/byteswap.hpp>
+#include <cstring>
+#include <iostream>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+class global_regs_local_impl : public global_regs
+{
+public:
+    global_regs_local_impl(const size_t ctrl_base) : _ctrl_base(ctrl_base)
+    {
+    }
+
+    virtual ~global_regs_local_impl(void)
+    {
+    }
+
+    boost::uint32_t peek32(const uhd::wb_iface::wb_addr_type addr)
+    {
+        // setup readback register
+        _poke32(_ctrl_base + global_regs::SR_CORE_READBACK, addr);
+        return _peek32(_ctrl_base);
+    }
+
+    void poke32(const uhd::wb_iface::wb_addr_type addr, const boost::uint32_t data)
+    {
+        _poke32(_ctrl_base + static_cast<size_t>(addr), data);
+    }
+
+
+private:
+    const size_t _ctrl_base;
+
+    UHD_INLINE void _poke32(const boost::uint32_t addr, const boost::uint32_t data)
+    {
+        volatile boost::uint32_t *p = reinterpret_cast<boost::uint32_t *>(addr);
+        *p = data;
+    }
+
+    UHD_INLINE boost::uint32_t _peek32(const boost::uint32_t addr)
+    {
+        volatile const boost::uint32_t *p = reinterpret_cast<const boost::uint32_t *>(addr);
+        return *p;
+    }
+};
+
+global_regs::sptr global_regs::make(const size_t ctrl_base)
+{
+    return sptr(new global_regs_local_impl(ctrl_base));
+}
+
+class global_regs_zc_impl : public global_regs
+{
+public:
+    global_regs_zc_impl(uhd::transport::zero_copy_if::sptr xport) : _xport(xport)
+    {
+    }
+
+    virtual ~global_regs_zc_impl(void)
+    {
+    }
+
+    boost::uint32_t peek32(const uhd::wb_iface::wb_addr_type addr)
+    {
+        global_regs_transaction_t transaction;
+        transaction.is_poke = uhd::htonx<boost::uint32_t>(0);
+        transaction.addr    = uhd::htonx<boost::uint32_t>(
+            static_cast<boost::uint32_t>(addr));
+        {
+            uhd::transport::managed_send_buffer::sptr buff = _xport->get_send_buff(10.0);
+            if (not buff or buff->size() < sizeof(transaction))
+                throw std::runtime_error("global_regs_zc_impl send timeout");
+            std::memcpy(buff->cast<void *>(), &transaction, sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+        {
+            uhd::transport::managed_recv_buffer::sptr buff = _xport->get_recv_buff(10.0);
+            if (not buff or buff->size() < sizeof(transaction))
+                throw std::runtime_error("global_regs_zc_impl recv timeout");
+            std::memcpy(&transaction, buff->cast<const void *>(), sizeof(transaction));
+        }
+        return uhd::ntohx<boost::uint32_t>(transaction.data);
+    }
+
+    void poke32(const uhd::wb_iface::wb_addr_type addr, const boost::uint32_t data)
+    {
+        global_regs_transaction_t transaction;
+        transaction.is_poke = uhd::htonx<boost::uint32_t>(1);
+        transaction.addr    = uhd::htonx<boost::uint32_t>(
+            static_cast<boost::uint32_t>(addr));
+        transaction.data    = uhd::htonx<boost::uint32_t>(data);
+        {
+            uhd::transport::managed_send_buffer::sptr buff = _xport->get_send_buff(10.0);
+            if (not buff or buff->size() < sizeof(transaction))
+                throw uhd::runtime_error("global_regs_zc_impl send timeout");
+            std::memcpy(buff->cast<void *>(), &transaction, sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+    }
+
+private:
+    uhd::transport::zero_copy_if::sptr _xport;
+};
+
+global_regs::sptr global_regs::make(uhd::transport::zero_copy_if::sptr xport)
+{
+    return sptr(new global_regs_zc_impl(xport));
+}
+
+}}};
diff --git a/host/lib/usrp/e300/e300_global_regs.hpp b/host/lib/usrp/e300/e300_global_regs.hpp
new file mode 100644
index 000000000..12693da79
--- /dev/null
+++ b/host/lib/usrp/e300/e300_global_regs.hpp
@@ -0,0 +1,78 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_GLOBAL_REGS_HPP
+#define INCLUDED_E300_GLOBAL_REGS_HPP
+
+#include <uhd/types/wb_iface.hpp>
+#include <uhd/transport/zero_copy.hpp>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+struct global_regs_transaction_t {
+    boost::uint32_t is_poke;
+    boost::uint32_t addr;
+    boost::uint32_t data;
+    boost::uint32_t pad;
+};
+
+class global_regs : boost::noncopyable, public virtual uhd::wb_iface
+{
+public:
+    typedef boost::shared_ptr<global_regs> sptr;
+
+    static sptr make(const size_t ctrl_base);
+    static sptr make(uhd::transport::zero_copy_if::sptr xport);
+
+    static const size_t SR_CORE_READBACK = 0;
+    static const size_t SR_CORE_MISC     = 4;
+    static const size_t SR_CORE_TEST     = 28;
+    static const size_t SR_CORE_XB_LOCAL = 32;
+
+    // leave some room for registers,
+    // xbar starts with an offset of one
+    // 1K page. A part of which is used for
+    // DST_LOOKUP for DST_LOOKUP
+
+    static const size_t SR_CORE_DST       = 1024;
+    static const size_t SR_CORE_XBAR      = 2048;
+
+    static const size_t RB32_CORE_MISC    = 1;
+    static const size_t RB32_CORE_COMPAT  = 2;
+    static const size_t RB32_CORE_GITHASH = 3;
+    static const size_t RB32_CORE_PLL     = 4;
+    static const size_t RB32_CORE_TEST    = 24;
+
+    // PPS selection
+    static const size_t PPS_GPS = 0;
+    static const size_t PPS_INT = 2;
+    static const size_t PPS_EXT = 3;
+};
+
+UHD_INLINE boost::uint32_t XB_ADDR(const boost::uint32_t addr)
+{
+    return global_regs::SR_CORE_XBAR + (addr << 2);
+}
+
+UHD_INLINE boost::uint32_t DST_ADDR(const boost::uint32_t addr)
+{
+    return global_regs::SR_CORE_DST + (addr << 2);
+}
+
+}}};
+
+#endif /* INCLUDED_E300_GLOBAL_REGS_HPP */
diff --git a/host/lib/usrp/e300/e300_i2c.cpp b/host/lib/usrp/e300/e300_i2c.cpp
new file mode 100644
index 000000000..d8f535a98
--- /dev/null
+++ b/host/lib/usrp/e300/e300_i2c.cpp
@@ -0,0 +1,409 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include <uhd/exception.hpp>
+#include <uhd/utils/byteswap.hpp>
+#include <uhd/transport/udp_simple.hpp>
+
+
+#include "e300_i2c.hpp"
+#include <cstring>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+class zc_impl : public i2c
+{
+public:
+    zc_impl(uhd::transport::zero_copy_if::sptr xport) : _xport(xport)
+    {
+    }
+
+    virtual ~zc_impl(void)
+    {
+    }
+
+    void set_i2c_reg8(
+        const boost::uint8_t addr,
+        const boost::uint8_t reg,
+        const boost::uint8_t value)
+    {
+        i2c_transaction_t transaction;
+        transaction.type = WRITE | ONEBYTE;
+        transaction.addr = addr;
+        transaction.reg  = uhd::htonx<boost::uint16_t>(reg);
+        transaction.data = value;
+        {
+            uhd::transport::managed_send_buffer::sptr buff = _xport->get_send_buff(10.0);
+            if (not buff or buff->size() < sizeof(transaction))
+                throw uhd::runtime_error("i2c_zc_impl send timeout");
+            std::memcpy(buff->cast<void *>(), &transaction, sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+    }
+
+    boost::uint8_t get_i2c_reg8(
+        const boost::uint8_t addr,
+        const boost::uint8_t reg)
+    {
+        i2c_transaction_t transaction;
+        transaction.type = READ | ONEBYTE;
+        transaction.addr = addr;
+        transaction.reg = uhd::htonx<boost::uint16_t>(reg);
+        {
+            uhd::transport::managed_send_buffer::sptr buff = _xport->get_send_buff(10.0);
+            if (not buff or buff->size() < sizeof(transaction))
+                throw std::runtime_error("i2c_zc_impl send timeout");
+            std::memcpy(buff->cast<void *>(), &transaction, sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+        {
+            uhd::transport::managed_recv_buffer::sptr buff = _xport->get_recv_buff(10.0);
+            if (not buff or buff->size() < sizeof(transaction))
+                throw std::runtime_error("i2c_zc_impl recv timeout");
+            std::memcpy(&transaction, buff->cast<const void *>(), sizeof(transaction));
+        }
+        return transaction.data;
+    }
+
+    void set_i2c_reg16(
+        const boost::uint8_t addr,
+        const boost::uint16_t reg,
+        const boost::uint8_t value)
+    {
+        i2c_transaction_t transaction;
+        transaction.type = WRITE | TWOBYTE;
+        transaction.addr = addr;
+        transaction.reg  = uhd::htonx<boost::uint16_t>(reg);
+        transaction.data = value;
+        {
+            uhd::transport::managed_send_buffer::sptr buff = _xport->get_send_buff(10.0);
+            if (not buff or buff->size() < sizeof(transaction))
+                throw uhd::runtime_error("i2c_zc_impl send timeout");
+            std::memcpy(buff->cast<void *>(), &transaction, sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+    }
+
+    boost::uint8_t get_i2c_reg16(
+        const boost::uint8_t addr,
+        const boost::uint16_t reg)
+    {
+        i2c_transaction_t transaction;
+        transaction.type = READ | TWOBYTE;
+        transaction.addr = addr;
+        transaction.reg  = uhd::htonx<boost::uint16_t>(reg);
+        {
+            uhd::transport::managed_send_buffer::sptr buff = _xport->get_send_buff(10.0);
+            if (not buff or buff->size() < sizeof(transaction))
+                throw std::runtime_error("i2c_zc_impl send timeout");
+            std::memcpy(buff->cast<void *>(), &transaction, sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+        {
+            uhd::transport::managed_recv_buffer::sptr buff = _xport->get_recv_buff(10.0);
+            if (not buff or buff->size() < sizeof(transaction))
+                throw std::runtime_error("i2c_zc_impl recv timeout");
+            std::memcpy(&transaction, buff->cast<const void *>(), sizeof(transaction));
+        }
+        return transaction.data;
+    }
+
+
+private:
+    uhd::transport::zero_copy_if::sptr _xport;
+};
+
+i2c::sptr i2c::make_zc(uhd::transport::zero_copy_if::sptr xport)
+{
+    return sptr(new zc_impl(xport));
+}
+
+class simple_udp_impl : public i2c
+{
+public:
+    simple_udp_impl(const std::string &ip_addr, const std::string &port)
+    {
+        _xport = uhd::transport::udp_simple::make_connected(ip_addr, port);
+    }
+
+    virtual ~simple_udp_impl(void)
+    {
+    }
+
+    void set_i2c_reg8(
+        const boost::uint8_t addr,
+        const boost::uint8_t reg,
+        const boost::uint8_t value)
+    {
+        i2c_transaction_t transaction;
+        transaction.type = i2c::WRITE | ONEBYTE;
+        transaction.addr = addr;
+        transaction.reg  = uhd::htonx<boost::uint16_t>(reg);
+        transaction.data = value;
+
+        _xport->send(
+            boost::asio::buffer(
+                &transaction,
+                sizeof(transaction)));
+    }
+
+    boost::uint8_t get_i2c_reg8(
+        const boost::uint8_t addr,
+        const boost::uint8_t reg)
+    {
+        i2c_transaction_t transaction;
+        transaction.type = i2c::READ | ONEBYTE;
+        transaction.addr = addr;
+        transaction.reg  = uhd::htonx<boost::uint16_t>(reg);
+        transaction.data = 0;
+
+        _xport->send(
+            boost::asio::buffer(
+                &transaction,
+                sizeof(transaction)));
+
+        boost::uint8_t buff[sizeof(i2c_transaction_t)] = {};
+        const size_t nbytes = _xport->recv(
+            boost::asio::buffer(buff), 0.100);
+        if (not (nbytes == sizeof(transaction)))
+            throw std::runtime_error("i2c_simple_udp_impl recv timeout");
+        i2c_transaction_t *reply = reinterpret_cast<i2c_transaction_t*>(buff);
+        return reply->data;
+    }
+
+    void set_i2c_reg16(
+        const boost::uint8_t addr,
+        const boost::uint16_t reg,
+        const boost::uint8_t value)
+    {
+        i2c_transaction_t transaction;
+        transaction.type = i2c::WRITE | TWOBYTE;
+        transaction.addr = addr;
+        transaction.reg = uhd::htonx<boost::uint16_t>(reg);
+        transaction.data = value;
+
+        _xport->send(
+            boost::asio::buffer(
+                &transaction,
+                sizeof(transaction)));
+    }
+
+    boost::uint8_t get_i2c_reg16(
+        const boost::uint8_t addr,
+        const boost::uint16_t reg)
+    {
+        i2c_transaction_t transaction;
+        transaction.type = i2c::READ | TWOBYTE;
+        transaction.addr = addr;
+        transaction.reg = uhd::htonx<boost::uint16_t>(reg);
+        transaction.data = 0;
+
+        _xport->send(
+            boost::asio::buffer(
+                &transaction,
+                sizeof(transaction)));
+
+        boost::uint8_t buff[sizeof(i2c_transaction_t)] = {};
+        const size_t nbytes = _xport->recv(
+            boost::asio::buffer(buff), 0.100);
+        if (not (nbytes == sizeof(transaction)))
+            throw std::runtime_error("i2c_simple_udp_impl recv timeout");
+        i2c_transaction_t *reply = reinterpret_cast<i2c_transaction_t*>(buff);
+        return reply->data;
+    }
+
+private:
+    uhd::transport::udp_simple::sptr _xport;
+};
+
+i2c::sptr i2c::make_simple_udp(
+    const std::string &ip_addr,
+    const std::string &port)
+{
+    return sptr(new simple_udp_impl(ip_addr,port));
+}
+
+}}} // namespace
+
+#ifdef E300_NATIVE
+
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#include <boost/thread.hpp>
+#include <boost/cstdint.hpp>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+class i2cdev_impl : public i2c
+{
+public:
+    i2cdev_impl(const std::string &device)
+    {
+        _fd = ::open(device.c_str(), O_RDWR);
+        if (_fd < 0)
+            throw uhd::system_error("open failed.");
+    }
+
+    virtual ~i2cdev_impl(void)
+    {
+        close(_fd);
+    }
+
+    void set_i2c_reg8(
+        const boost::uint8_t addr,
+        const boost::uint8_t reg,
+        const boost::uint8_t value)
+    {
+        boost::uint8_t outbuf[2];
+        i2c_rdwr_ioctl_data packets;
+        i2c_msg messages[1];
+
+        messages[0].addr = addr;
+        messages[0].flags = 0;
+        messages[0].len = sizeof(outbuf);
+        messages[0].buf = outbuf;
+
+        outbuf[0] = reg;
+        outbuf[1] = value;
+
+        packets.msgs = messages;
+        packets.nmsgs = 1;
+
+        if(::ioctl(_fd, I2C_RDWR, &packets) < 0) {
+            throw std::runtime_error("ioctl failed");
+        }
+        // this is ugly
+        boost::this_thread::sleep(boost::posix_time::milliseconds(5));
+    }
+
+    boost::uint8_t get_i2c_reg8(
+        const boost::uint8_t addr,
+        const boost::uint8_t reg)
+    {
+        i2c_rdwr_ioctl_data packets;
+        i2c_msg messages[2];
+
+        boost::uint8_t outbuf = reg;
+        messages[0].addr = addr;
+        messages[0].flags = 0;
+        messages[0].len = sizeof(outbuf);
+        messages[0].buf = &outbuf;
+
+        boost::uint8_t inbuf;
+        messages[1].addr = addr;
+        messages[1].flags = I2C_M_RD;
+        messages[1].len = sizeof(inbuf);
+        messages[1].buf = &inbuf;
+
+        packets.msgs = messages;
+        packets.nmsgs = 2;
+
+        if(::ioctl(_fd, I2C_RDWR, &packets) < 0) {
+            throw std::runtime_error("ioctl failed.");
+        }
+
+        return inbuf;
+    }
+
+    // the daughterboard uses 16 bit addresses
+    void set_i2c_reg16(
+        const boost::uint8_t addr,
+        const boost::uint16_t reg,
+        const boost::uint8_t value)
+    {
+        boost::uint8_t outbuf[3];
+        i2c_rdwr_ioctl_data packets;
+        i2c_msg messages[1];
+
+        messages[0].addr = addr;
+        messages[0].flags = 0;
+        messages[0].len = sizeof(outbuf);
+        messages[0].buf = outbuf;
+
+        outbuf[0] = (reg >> 8) & 0xff;
+        outbuf[1] = reg & 0xff;
+        outbuf[2] = value;
+
+        packets.msgs = messages;
+        packets.nmsgs = 1;
+
+        if(::ioctl(_fd, I2C_RDWR, &packets) < 0) {
+            throw std::runtime_error("ioctl failed");
+        }
+        // this is ugly
+        boost::this_thread::sleep(boost::posix_time::milliseconds(5));
+    }
+
+
+    // the daughterboard eeprom uses 16 bit addresses
+    boost::uint8_t get_i2c_reg16(
+        const boost::uint8_t addr,
+        const boost::uint16_t reg)
+    {
+        i2c_rdwr_ioctl_data packets;
+        i2c_msg messages[2];
+
+        // always little endian
+        boost::uint8_t outbuf[2];
+        outbuf[0] = (reg >> 8) & 0xff;
+        outbuf[1] = reg & 0xff;
+
+        messages[0].addr = addr;
+        messages[0].flags = 0;
+        messages[0].len = sizeof(outbuf);
+        messages[0].buf = outbuf;
+
+        boost::uint8_t inbuf;
+        messages[1].addr = addr;
+        messages[1].flags = I2C_M_RD;
+        messages[1].len = sizeof(inbuf);
+        messages[1].buf = &inbuf;
+
+        packets.msgs = messages;
+        packets.nmsgs = 2;
+
+        if(::ioctl(_fd, I2C_RDWR, &packets) < 0) {
+            throw std::runtime_error("ioctl failed.");
+        }
+
+        return inbuf;
+    }
+
+private:
+    int _fd;
+};
+
+}}} // namespace
+
+using namespace uhd::usrp::e300;
+
+i2c::sptr i2c::make_i2cdev(const std::string &device)
+{
+    return sptr(new i2cdev_impl(device));
+}
+#else
+using namespace uhd::usrp::e300;
+
+i2c::sptr i2c::make_i2cdev(const std::string &)
+{
+    throw uhd::assertion_error("i2c::make() !E300_NATIVE");
+}
+#endif // E300_NATIVE
diff --git a/host/lib/usrp/e300/e300_i2c.hpp b/host/lib/usrp/e300/e300_i2c.hpp
new file mode 100644
index 000000000..6cca7ab70
--- /dev/null
+++ b/host/lib/usrp/e300/e300_i2c.hpp
@@ -0,0 +1,77 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_I2C_HPP
+#define INCLUDED_E300_I2C_HPP
+
+#include <boost/noncopyable.hpp>
+#include <boost/cstdint.hpp>
+#include <boost/shared_ptr.hpp>
+
+#include <uhd/transport/zero_copy.hpp>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+struct i2c_transaction_t {
+    boost::uint16_t reg;
+    boost::uint8_t  addr;
+    boost::uint8_t  data;
+    boost::uint8_t  type;
+};
+
+class i2c : public boost::noncopyable
+{
+public:
+    typedef boost::shared_ptr<i2c> sptr;
+
+    static sptr make_i2cdev(const std::string &device);
+    static sptr make_zc(uhd::transport::zero_copy_if::sptr xport);
+    static sptr make_simple_udp(
+        const std::string &ip_addr,
+        const std::string &port);
+
+    virtual boost::uint8_t get_i2c_reg8(
+        const boost::uint8_t addr,
+        const boost::uint8_t reg) = 0;
+
+    virtual boost::uint8_t get_i2c_reg16(
+        const boost::uint8_t addr,
+        const boost::uint16_t reg) = 0;
+
+    virtual void set_i2c_reg8(
+        const boost::uint8_t addr,
+        const boost::uint8_t reg,
+        const boost::uint8_t value) = 0;
+
+    virtual void set_i2c_reg16(
+        const boost::uint8_t addr,
+        const boost::uint16_t reg,
+        const boost::uint8_t value) = 0;
+
+
+    static const boost::uint8_t DB_EEPROM_ADDR = 0x50;
+    static const boost::uint8_t MB_EEPROM_ADDR = 0x51;
+
+    static const boost::uint8_t WRITE          = 0x1;
+    static const boost::uint8_t READ           = 0x0;
+    static const boost::uint8_t TWOBYTE        = 0x4;
+    static const boost::uint8_t ONEBYTE        = 0x2;
+};
+
+}}};
+
+#endif // INCLUDED_E300_I2C_HPP
diff --git a/host/lib/usrp/e300/e300_impl.cpp b/host/lib/usrp/e300/e300_impl.cpp
new file mode 100644
index 000000000..0f4cb5852
--- /dev/null
+++ b/host/lib/usrp/e300/e300_impl.cpp
@@ -0,0 +1,1347 @@
+//
+// Copyright 2013-2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "e300_impl.hpp"
+#include "e300_defaults.hpp"
+#include "e300_fpga_defs.hpp"
+#include "e300_spi.hpp"
+#include "e300_regs.hpp"
+#include "e300_eeprom_manager.hpp"
+#include "e300_sensor_manager.hpp"
+#include "e300_common.hpp"
+#include "e300_remote_codec_ctrl.hpp"
+
+#include <uhd/utils/msg.hpp>
+#include <uhd/utils/log.hpp>
+#include <uhd/utils/static.hpp>
+#include <uhd/utils/images.hpp>
+#include <uhd/usrp/dboard_eeprom.hpp>
+#include <uhd/transport/if_addrs.hpp>
+#include <uhd/transport/udp_zero_copy.hpp>
+#include <uhd/transport/udp_simple.hpp>
+#include <uhd/types/sensors.hpp>
+#include <boost/make_shared.hpp>
+#include <boost/algorithm/string.hpp>
+#include <boost/format.hpp>
+#include <boost/filesystem.hpp>
+#include <boost/functional/hash.hpp>
+#include <boost/bind.hpp>
+#include <boost/make_shared.hpp>
+#include <boost/assign/list_of.hpp>
+#include <boost/thread/thread.hpp> //sleep
+#include <boost/asio.hpp>
+#include <fstream>
+
+using namespace uhd;
+using namespace uhd::usrp;
+using namespace uhd::transport;
+namespace fs = boost::filesystem;
+namespace asio = boost::asio;
+
+//! mapping of frontend to radio perif index
+static const size_t FE0 = 1;
+static const size_t FE1 = 0;
+
+namespace uhd { namespace usrp { namespace e300 {
+
+/***********************************************************************
+ * Discovery
+ **********************************************************************/
+
+static std::vector<std::string> discover_ip_addrs(
+    const std::string& addr_hint, const std::string& port)
+{
+    std::vector<std::string> addrs;
+
+    // Create a UDP transport to communicate:
+    // Some devices will cause a throw when opened for a broadcast address.
+    // We print and recover so the caller can loop through all bcast addrs.
+    uhd::transport::udp_simple::sptr udp_bcast_xport;
+    try {
+        udp_bcast_xport = uhd::transport::udp_simple::make_broadcast(addr_hint, port);
+    } catch(const std::exception &e) {
+        UHD_MSG(error) << boost::format("Cannot open UDP transport on %s for discovery\n%s")
+        % addr_hint % e.what() << std::endl;
+        return addrs;
+    } catch(...) {
+        UHD_MSG(error) << "E300 Network discovery unknown error" << std::endl;
+        return addrs;
+    }
+
+    // TODO: Do not abuse the I2C transport here ...
+    // we send a read request to i2c address 0x51,
+    // to read register 0
+    i2c_transaction_t req;
+    req.type = i2c::READ | i2c::ONEBYTE;
+    req.addr = 0x51; // mboard's eeprom address, we don't really care
+    req.reg = 4;
+
+    // send dummy request
+    try {
+    udp_bcast_xport->send(boost::asio::buffer(&req, sizeof(req)));
+    } catch (const std::exception &ex) {
+        UHD_MSG(error) << "E300 Network discovery error " << ex.what() << std::endl;
+        return addrs;
+    } catch(...) {
+        UHD_MSG(error) << "E300 Network discovery unknown error" << std::endl;
+        return addrs;
+    }
+
+    // loop for replies until timeout
+    while (true) {
+        boost::uint8_t buff[sizeof(i2c_transaction_t)] = {};
+        const size_t nbytes = udp_bcast_xport->recv(boost::asio::buffer(buff), 0.050);
+        if (nbytes == 0)
+            break; //No more responses
+
+        const i2c_transaction_t *reply = reinterpret_cast<const i2c_transaction_t*>(buff);
+        if (req.addr == reply->addr)
+           addrs.push_back(udp_bcast_xport->get_recv_addr());
+    }
+
+    return addrs;
+}
+
+static bool is_loopback(const if_addrs_t &if_addrs)
+{
+       return if_addrs.inet == asio::ip::address_v4::loopback().to_string();
+}
+
+static device_addrs_t e300_find(const device_addr_t &multi_dev_hint)
+{
+    // handle multi device discovery
+    device_addrs_t hints = separate_device_addr(multi_dev_hint);
+
+    if (hints.size() > 1) {
+        device_addrs_t found_devices;
+        std::string err_msg;
+        BOOST_FOREACH(const device_addr_t &hint_i, hints)
+        {
+            device_addrs_t found_devices_i = e300_find(hint_i);
+            if(found_devices_i.size() != 1)
+                err_msg += str(boost::format(
+                    "Could not resolve device hint \"%s\" to a single device.")
+                    % hint_i.to_string());
+            else
+                found_devices.push_back(found_devices_i[0]);
+            if (found_devices.empty())
+                return device_addrs_t();
+
+            if (not err_msg.empty())
+                throw uhd::value_error(err_msg);
+        }
+        return device_addrs_t(1, combine_device_addrs(found_devices));
+    }
+
+    // initialize the hint for a single device case
+    UHD_ASSERT_THROW(hints.size() <= 1);
+    hints.resize(1); // in case it was empty
+    device_addr_t hint = hints[0];
+    device_addrs_t e300_addrs;
+
+    // return an empty list of addresses when type is set to non-e300
+    if (hint.has_key("type") and hint["type"] != "e3x0")
+        return e300_addrs;
+
+    const bool loopback_only =
+        get_if_addrs().size() == 1 and is_loopback(get_if_addrs().at(0));
+
+    // if we don't have connectivity, we might as well skip the network part
+    if (not loopback_only) {
+        // if no address or node has been specified, send a broadcast
+        if ((not hint.has_key("addr")) and (not hint.has_key("node"))) {
+            BOOST_FOREACH(const if_addrs_t &if_addrs, get_if_addrs())
+            {
+                // avoid the loopback device
+                if (is_loopback(if_addrs))
+                    continue;
+
+                // create a new hint with this broadcast address
+                device_addr_t new_hint = hint;
+                new_hint["addr"] = if_addrs.bcast;
+
+                // call discover with the new hint ad append results
+                device_addrs_t new_e300_addrs = e300_find(new_hint);
+                e300_addrs.insert(e300_addrs.begin(),
+                    new_e300_addrs.begin(), new_e300_addrs.end());
+
+            }
+            return e300_addrs;
+        }
+
+        std::vector<std::string> ip_addrs = discover_ip_addrs(
+            hint["addr"], E300_SERVER_I2C_PORT);
+
+        BOOST_FOREACH(const std::string &ip_addr, ip_addrs)
+        {
+            device_addr_t new_addr;
+            new_addr["type"] = "e3x0";
+            new_addr["addr"] = ip_addr;
+
+            // see if we can read the eeprom
+            try {
+                e300_eeprom_manager eeprom_manager(
+                    i2c::make_simple_udp(new_addr["addr"], E300_SERVER_I2C_PORT));
+                const mboard_eeprom_t eeprom = eeprom_manager.get_mb_eeprom();
+                new_addr["name"] = eeprom["name"];
+                new_addr["serial"] = eeprom["serial"];
+                new_addr["product"] = eeprom["product"];
+            } catch (...) {
+                // set these values as empty string, so the device may still be found
+                // and the filters below can still operate on the discovered device
+                new_addr["name"] = "";
+                new_addr["serial"] = "";
+            }
+            // filter the discovered device below by matching optional keys
+            if ((not hint.has_key("name")   or hint["name"]   == new_addr["name"]) and
+                (not hint.has_key("serial") or hint["serial"] == new_addr["serial"]))
+            {
+                e300_addrs.push_back(new_addr);
+            }
+        }
+    }
+
+    // finally search locally
+    // if device node is not provided,
+    // use the default one
+    if (not hint.has_key("node")) {
+        device_addr_t new_addr = hint;
+        new_addr["node"] = "/dev/axi_fpga";
+        return e300_find(new_addr);
+    }
+
+    // use the given node
+    if (fs::exists(hint["node"])) {
+        device_addr_t new_addr;
+        new_addr["type"] = "e3x0";
+        new_addr["node"] = fs::system_complete(fs::path(hint["node"])).string();
+
+        try {
+            e300_eeprom_manager eeprom_manager(i2c::make_i2cdev(E300_I2CDEV_DEVICE));
+            const mboard_eeprom_t eeprom = eeprom_manager.get_mb_eeprom();
+            new_addr["name"] = eeprom["name"];
+            new_addr["serial"] = eeprom["serial"];
+            new_addr["product"] = eeprom["product"];
+        } catch (...) {
+            // set these values as empty string, so the device may still be found
+            // and the filters below can still operate on the discovered device
+            new_addr["name"] = "";
+            new_addr["serial"] = "";
+        }
+        // filter the discovered device below by matching optional keys
+        if ((not hint.has_key("name")   or hint["name"]   == new_addr["name"]) and
+            (not hint.has_key("serial") or hint["serial"] == new_addr["serial"]))
+        {
+            e300_addrs.push_back(new_addr);
+        }
+    }
+
+    return e300_addrs;
+}
+
+
+/***********************************************************************
+ * Make
+ **********************************************************************/
+static device::sptr e300_make(const device_addr_t &device_addr)
+{
+    UHD_LOG << "e300_make with args " << device_addr.to_pp_string() << std::endl;
+    if(device_addr.has_key("server"))
+        throw uhd::runtime_error(
+            str(boost::format("Please run the server executable \"%s\"")
+                % "usrp_e3x0_network_mode"));
+    else
+        return device::sptr(new e300_impl(device_addr));
+}
+
+/***********************************************************************
+ * Structors
+ **********************************************************************/
+e300_impl::e300_impl(const uhd::device_addr_t &device_addr)
+    : _device_addr(device_addr)
+    , _xport_path(device_addr.has_key("addr") ? ETH : AXI)
+    , _sid_framer(0)
+{
+    _type = uhd::device::USRP;
+
+    _async_md.reset(new async_md_type(1000/*messages deep*/));
+
+    ////////////////////////////////////////////////////////////////////
+    // load the fpga image
+    ////////////////////////////////////////////////////////////////////
+    if (_xport_path == AXI) {
+        if (not device_addr.has_key("no_reload_fpga")) {
+            // Load FPGA image if provided via args
+            if (device_addr.has_key("fpga")) {
+                common::load_fpga_image(device_addr["fpga"]);
+            // Else load the FPGA image based on the product ID
+            } else {
+                //extract the FPGA path for the e300
+                const boost::uint16_t pid = boost::lexical_cast<boost::uint16_t>(
+                    device_addr["product"]);
+                std::string fpga_image;
+                switch(e300_eeprom_manager::get_mb_type(pid)) {
+                case e300_eeprom_manager::USRP_E310_MB:
+                    fpga_image = find_image_path(E310_FPGA_FILE_NAME);
+                    break;
+                case e300_eeprom_manager::USRP_E300_MB:
+                    fpga_image = find_image_path(E300_FPGA_FILE_NAME);
+                    break;
+                case e300_eeprom_manager::UNKNOWN:
+                default:
+                    UHD_MSG(warning) << "Unknown motherboard type, loading e300 image."
+                                     << std::endl;
+                    fpga_image = find_image_path(E300_FPGA_FILE_NAME);
+                    break;
+                }
+                common::load_fpga_image(fpga_image);
+            }
+        }
+    }
+
+    ////////////////////////////////////////////////////////////////////
+    // setup fifo xports
+    ////////////////////////////////////////////////////////////////////
+    _ctrl_xport_params.recv_frame_size = e300::DEFAULT_CTRL_FRAME_SIZE;
+    _ctrl_xport_params.num_recv_frames = e300::DEFAULT_CTRL_NUM_FRAMES;
+    _ctrl_xport_params.send_frame_size = e300::DEFAULT_CTRL_FRAME_SIZE;
+    _ctrl_xport_params.num_send_frames = e300::DEFAULT_CTRL_NUM_FRAMES;
+
+    _data_xport_params.recv_frame_size = e300::DEFAULT_RX_DATA_FRAME_SIZE;
+    _data_xport_params.num_recv_frames = e300::DEFAULT_RX_DATA_NUM_FRAMES;
+    _data_xport_params.send_frame_size = e300::DEFAULT_TX_DATA_FRAME_SIZE;
+    _data_xport_params.num_send_frames = e300::DEFAULT_TX_DATA_NUM_FRAMES;
+
+    // until we figure out why this goes wrong we'll keep this hack around
+    if (_xport_path == ETH) {
+        _data_xport_params.recv_frame_size =
+            std::min(e300::MAX_NET_RX_DATA_FRAME_SIZE, _data_xport_params.recv_frame_size);
+        _data_xport_params.send_frame_size =
+            std::min(e300::MAX_NET_TX_DATA_FRAME_SIZE, _data_xport_params.send_frame_size);
+    }
+    udp_zero_copy::buff_params dummy_buff_params_out;
+
+    if (_xport_path == ETH) {
+        zero_copy_if::sptr codec_xport =
+            udp_zero_copy::make(device_addr["addr"], E300_SERVER_CODEC_PORT, _ctrl_xport_params, dummy_buff_params_out, device_addr);
+        _codec_ctrl = e300_remote_codec_ctrl::make(codec_xport);
+        zero_copy_if::sptr gregs_xport =
+            udp_zero_copy::make(device_addr["addr"], E300_SERVER_GREGS_PORT, _ctrl_xport_params, dummy_buff_params_out, device_addr);
+        _global_regs = global_regs::make(gregs_xport);
+
+        zero_copy_if::sptr i2c_xport;
+        i2c_xport = udp_zero_copy::make(device_addr["addr"], E300_SERVER_I2C_PORT, _ctrl_xport_params, dummy_buff_params_out, device_addr);
+        _eeprom_manager = boost::make_shared<e300_eeprom_manager>(i2c::make_zc(i2c_xport));
+
+        uhd::transport::zero_copy_xport_params sensor_xport_params;
+        sensor_xport_params.recv_frame_size = 128;
+        sensor_xport_params.num_recv_frames = 10;
+        sensor_xport_params.send_frame_size = 128;
+        sensor_xport_params.num_send_frames = 10;
+
+        zero_copy_if::sptr sensors_xport;
+        sensors_xport = udp_zero_copy::make(device_addr["addr"], E300_SERVER_SENSOR_PORT, sensor_xport_params, dummy_buff_params_out, device_addr);
+        _sensor_manager = e300_sensor_manager::make_proxy(sensors_xport);
+
+    } else {
+        e300_fifo_config_t fifo_cfg;
+        try {
+            fifo_cfg = e300_read_sysfs();
+        } catch (uhd::lookup_error &e) {
+            throw uhd::runtime_error("Failed to get driver parameters from sysfs.");
+        }
+        _fifo_iface = e300_fifo_interface::make(fifo_cfg);
+        _global_regs = global_regs::make(_fifo_iface->get_global_regs_base());
+
+        ad9361_params::sptr client_settings = boost::make_shared<e300_ad9361_client_t>();
+        _codec_ctrl = ad9361_ctrl::make_spi(client_settings, spi::make(E300_SPIDEV_DEVICE), 1);
+        // This is horrible ... why do I have to sleep here?
+        boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+        _eeprom_manager = boost::make_shared<e300_eeprom_manager>(i2c::make_i2cdev(E300_I2CDEV_DEVICE));
+    }
+
+    UHD_MSG(status) << "Detecting internal GPSDO.... " << std::flush;
+    if (_xport_path == AXI) {
+        try {
+            _gps = gps::ublox::ubx::control::make("/dev/ttyPS1", 9600);
+        } catch (std::exception &e) {
+            UHD_MSG(error) << "An error occured making GPSDO control: " << e.what() << std::endl;
+        }
+        _sensor_manager = e300_sensor_manager::make_local(_gps);
+    }
+    UHD_MSG(status) << (_sensor_manager->get_gps_found() ? "found" : "not found")  << std::endl;
+
+    // Verify we can talk to the e300 core control registers ...
+    UHD_MSG(status) << "Initializing core control..." << std::endl;
+    this->_register_loopback_self_test(_global_regs);
+
+    // Verify fpga compatibility version matches at least for the major
+    if (_get_version(FPGA_MAJOR) != fpga::COMPAT_MAJOR) {
+        throw uhd::runtime_error(str(boost::format(
+            "Expected FPGA compatibility number %lu.x, but got %lu.%lu:\n"
+            "The FPGA build is not compatible with the host code build.\n"
+            "%s"
+        ) % fpga::COMPAT_MAJOR
+          % _get_version(FPGA_MAJOR) % _get_version(FPGA_MINOR)
+          % print_images_error()));
+    }
+
+    ////////////////////////////////////////////////////////////////////
+    // Initialize the properties tree
+    ////////////////////////////////////////////////////////////////////
+    _tree = property_tree::make();
+    _tree->create<std::string>("/name").set("E-Series Device");
+    const fs_path mb_path = "/mboards/0";
+    _tree->create<std::string>(mb_path / "name")
+        .set(_eeprom_manager->get_mb_type_string());
+
+    _tree->create<std::string>(mb_path / "codename").set("Troll");
+
+    _tree->create<std::string>(mb_path / "fpga_version").set(
+        str(boost::format("%u.%u")
+            % _get_version(FPGA_MAJOR)
+            % _get_version(FPGA_MINOR)));
+
+    _tree->create<std::string>(mb_path / "fpga_version_hash").set(
+        _get_version_hash());
+
+    ////////////////////////////////////////////////////////////////////
+    // and do the misc mboard sensors
+    ////////////////////////////////////////////////////////////////////
+    _tree->create<int>(mb_path / "sensors");
+    BOOST_FOREACH(const std::string &name, _sensor_manager->get_sensors())
+    {
+        _tree->create<sensor_value_t>(mb_path / "sensors" / name)
+            .publish(boost::bind(&e300_sensor_manager::get_sensor, _sensor_manager, name));
+    }
+
+    ////////////////////////////////////////////////////////////////////
+    // setup the mboard eeprom
+    ////////////////////////////////////////////////////////////////////
+    _tree->create<mboard_eeprom_t>(mb_path / "eeprom")
+        .set(_eeprom_manager->get_mb_eeprom())  // set first...
+        .subscribe(boost::bind(
+            &e300_eeprom_manager::write_mb_eeprom,
+            _eeprom_manager, _1));
+
+    ////////////////////////////////////////////////////////////////////
+    // clocking
+    ////////////////////////////////////////////////////////////////////
+    _tree->create<double>(mb_path / "tick_rate")
+        .coerce(boost::bind(&e300_impl::_set_tick_rate, this, _1))
+        .publish(boost::bind(&e300_impl::_get_tick_rate, this))
+        .subscribe(boost::bind(&e300_impl::_update_tick_rate, this, _1));
+
+    //default some chains on -- needed for setup purposes
+    _codec_ctrl->set_active_chains(true, false, true, false);
+    _codec_ctrl->set_clock_rate(50e6);
+
+    ////////////////////////////////////////////////////////////////////
+    // setup radios
+    ////////////////////////////////////////////////////////////////////
+    for(size_t instance = 0; instance < fpga::NUM_RADIOS; instance++)
+        this->_setup_radio(instance);
+
+    _codec_ctrl->data_port_loopback(true);
+
+    // Radio 0 loopback through AD9361
+    this->_codec_loopback_self_test(_radio_perifs[0].ctrl);
+    // Radio 1 loopback through AD9361
+    this->_codec_loopback_self_test(_radio_perifs[1].ctrl);
+
+    _codec_ctrl->data_port_loopback(false);
+
+    ////////////////////////////////////////////////////////////////////
+    // internal gpios
+    ////////////////////////////////////////////////////////////////////
+    gpio_core_200::sptr fp_gpio = gpio_core_200::make(_radio_perifs[0].ctrl, TOREG(SR_FP_GPIO), RB32_FP_GPIO);
+    const std::vector<std::string> gpio_attrs = boost::assign::list_of("CTRL")("DDR")("OUT")("ATR_0X")("ATR_RX")("ATR_TX")("ATR_XX");
+    BOOST_FOREACH(const std::string &attr, gpio_attrs)
+    {
+        _tree->create<boost::uint32_t>(mb_path / "gpio" / "INT0" / attr)
+            .subscribe(boost::bind(&e300_impl::_set_internal_gpio, this, fp_gpio, attr, _1))
+            .set(0);
+    }
+    _tree->create<boost::uint8_t>(mb_path / "gpio" / "INT0" / "READBACK")
+        .publish(boost::bind(&e300_impl::_get_internal_gpio, this, fp_gpio, "READBACK"));
+
+
+    ////////////////////////////////////////////////////////////////////
+    // register the time keepers - only one can be the highlander
+    ////////////////////////////////////////////////////////////////////
+    _tree->create<time_spec_t>(mb_path / "time" / "now")
+        .publish(boost::bind(&time_core_3000::get_time_now, _radio_perifs[0].time64))
+        .subscribe(boost::bind(&time_core_3000::set_time_now, _radio_perifs[0].time64, _1))
+        .subscribe(boost::bind(&time_core_3000::set_time_now, _radio_perifs[1].time64, _1));
+    _tree->create<time_spec_t>(mb_path / "time" / "pps")
+        .publish(boost::bind(&time_core_3000::get_time_last_pps, _radio_perifs[0].time64))
+        .subscribe(boost::bind(&time_core_3000::set_time_next_pps, _radio_perifs[0].time64, _1))
+        .subscribe(boost::bind(&time_core_3000::set_time_next_pps, _radio_perifs[1].time64, _1));
+    //setup time source props
+    _tree->create<std::string>(mb_path / "time_source" / "value")
+        .subscribe(boost::bind(&e300_impl::_update_time_source, this, _1));
+    static const std::vector<std::string> time_sources = boost::assign::list_of("none")("external")("gpsdo");
+    _tree->create<std::vector<std::string> >(mb_path / "time_source" / "options").set(time_sources);
+    //setup reference source props
+    _tree->create<std::string>(mb_path / "clock_source" / "value")
+        .subscribe(boost::bind(&e300_impl::_update_clock_source, this, _1));
+    static const std::vector<std::string> clock_sources = boost::assign::list_of("internal");
+    // not implemented ("external")("gpsdo");
+    _tree->create<std::vector<std::string> >(mb_path / "clock_source" / "options").set(clock_sources);
+
+    ////////////////////////////////////////////////////////////////////
+    // dboard eeproms but not really
+    ////////////////////////////////////////////////////////////////////
+    dboard_eeprom_t db_eeprom;
+    _tree->create<dboard_eeprom_t>(mb_path / "dboards" / "A" / "rx_eeprom")
+        .set(_eeprom_manager->get_db_eeprom())
+        .subscribe(boost::bind(
+            &e300_eeprom_manager::write_db_eeprom,
+            _eeprom_manager, _1));
+
+    _tree->create<dboard_eeprom_t>(mb_path / "dboards" / "A" / "tx_eeprom")
+        .set(_eeprom_manager->get_db_eeprom())
+        .subscribe(boost::bind(
+            &e300_eeprom_manager::write_db_eeprom,
+            _eeprom_manager, _1));
+
+    _tree->create<dboard_eeprom_t>(mb_path / "dboards" / "A" / "gdb_eeprom").set(db_eeprom);
+
+    ////////////////////////////////////////////////////////////////////
+    // create RF frontend interfacing
+    ////////////////////////////////////////////////////////////////////
+    {
+        const fs_path codec_path = mb_path / ("rx_codecs") / "A";
+        _tree->create<std::string>(codec_path / "name").set("E3x0 RX dual ADC");
+        _tree->create<int>(codec_path / "gains"); //empty cuz gains are in frontend
+    }
+    {
+        const fs_path codec_path = mb_path / ("tx_codecs") / "A";
+        _tree->create<std::string>(codec_path / "name").set("E3x0 TX dual DAC");
+        _tree->create<int>(codec_path / "gains"); //empty cuz gains are in frontend
+    }
+
+    ////////////////////////////////////////////////////////////////////
+    // create frontend mapping
+    ////////////////////////////////////////////////////////////////////
+
+     std::vector<size_t> default_map(2, 0);
+     default_map[0] = 0; // set A->0
+     default_map[1] = 1; // set B->1, even if there's only A
+
+    _tree->create<std::vector<size_t> >(mb_path / "rx_chan_dsp_mapping").set(default_map);
+    _tree->create<std::vector<size_t> >(mb_path / "tx_chan_dsp_mapping").set(default_map);
+
+    _tree->create<subdev_spec_t>(mb_path / "rx_subdev_spec")
+        .set(subdev_spec_t())
+        .subscribe(boost::bind(&e300_impl::_update_subdev_spec, this, "rx", _1));
+    _tree->create<subdev_spec_t>(mb_path / "tx_subdev_spec")
+        .set(subdev_spec_t())
+        .subscribe(boost::bind(&e300_impl::_update_subdev_spec, this, "tx", _1));
+
+    ////////////////////////////////////////////////////////////////////
+    // do some post-init tasks
+    ////////////////////////////////////////////////////////////////////
+
+    // init the clock rate to something reasonable
+    _tree->access<double>(mb_path / "tick_rate").set(
+        device_addr.cast<double>("master_clock_rate", e300::DEFAULT_TICK_RATE));
+
+    // subdev spec contains full width of selections
+    subdev_spec_t rx_spec, tx_spec;
+    BOOST_FOREACH(const std::string &fe, _tree->list(mb_path / "dboards" / "A" / "rx_frontends"))
+    {
+        rx_spec.push_back(subdev_spec_pair_t("A", fe));
+    }
+    BOOST_FOREACH(const std::string &fe, _tree->list(mb_path / "dboards" / "A" / "tx_frontends"))
+    {
+        tx_spec.push_back(subdev_spec_pair_t("A", fe));
+    }
+    _tree->access<subdev_spec_t>(mb_path / "rx_subdev_spec").set(rx_spec);
+    _tree->access<subdev_spec_t>(mb_path / "tx_subdev_spec").set(tx_spec);
+
+    if (_sensor_manager->get_gps_found()) {
+        _tree->access<std::string>(mb_path / "clock_source" / "value").set("gpsdo");
+        _tree->access<std::string>(mb_path / "time_source" / "value").set("gpsdo");
+        UHD_MSG(status) << "References initialized to GPSDO sources" << std::endl;
+        const time_t tp = time_t(_sensor_manager->get_gps_time().to_int());
+        _tree->access<time_spec_t>(mb_path / "time" / "pps").set(time_spec_t(tp));
+        //wait for time to be set (timeout after 1 second)
+        for (int i = 0; i < 10; i++)
+        {
+            boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+            if(tp == (_tree->access<time_spec_t>(mb_path / "time" / "pps").get()).get_full_secs())
+                break;
+        }
+    } else {
+        // init to default time and clock source
+        _tree->access<std::string>(mb_path / "clock_source" / "value").set(
+            e300::DEFAULT_CLOCK_SRC);
+        _tree->access<std::string>(mb_path / "time_source" / "value").set(
+            e300::DEFAULT_TIME_SRC);
+
+            UHD_MSG(status) << "References initialized to internal sources" << std::endl;
+    }
+}
+
+boost::uint8_t e300_impl::_get_internal_gpio(
+    gpio_core_200::sptr gpio,
+    const std::string &)
+{
+    return boost::uint32_t(gpio->read_gpio(dboard_iface::UNIT_RX));
+}
+
+void e300_impl::_set_internal_gpio(
+    gpio_core_200::sptr gpio,
+    const std::string &attr,
+    const boost::uint32_t value)
+{
+    if (attr == "CTRL")
+        return gpio->set_pin_ctrl(dboard_iface::UNIT_RX, value);
+    else if (attr == "DDR")
+        return gpio->set_gpio_ddr(dboard_iface::UNIT_RX, value);
+    else if (attr == "OUT")
+        return gpio->set_gpio_out(dboard_iface::UNIT_RX, value);
+    else if (attr == "ATR_0X")
+        return gpio->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_IDLE, value);
+    else if (attr == "ATR_RX")
+        return gpio->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_RX_ONLY, value);
+    else if (attr == "ATR_TX")
+        return gpio->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_TX_ONLY, value);
+    else if (attr == "ATR_XX")
+        return gpio->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_FULL_DUPLEX, value);
+}
+
+uhd::sensor_value_t e300_impl::_get_fe_pll_lock(const bool is_tx)
+{
+    const boost::uint32_t st =
+        _global_regs->peek32(global_regs::RB32_CORE_PLL);
+    const bool locked = is_tx ? st & 0x1 : st & 0x2;
+    return sensor_value_t("LO", locked, "locked", "unlocked");
+}
+
+e300_impl::~e300_impl(void)
+{
+    /* NOP */
+}
+
+void e300_impl::_enforce_tick_rate_limits(
+        const size_t chan_count,
+        const double tick_rate,
+        const std::string &direction)
+{
+    const size_t max_chans = 2;
+    if (chan_count > max_chans) {
+        throw uhd::value_error(boost::str(
+            boost::format("cannot not setup %d %s channels (maximum is %d)")
+                % chan_count
+                % direction
+                % max_chans
+        ));
+    } else {
+        const double max_tick_rate = ad9361_device_t::AD9361_MAX_CLOCK_RATE / ((chan_count <= 1) ? 1 : 2);
+        if (tick_rate - max_tick_rate >= 1.0)
+        {
+            throw uhd::value_error(boost::str(
+                boost::format("current master clock rate (%.6f MHz) exceeds maximum possible master clock rate (%.6f MHz) when using %d %s channels")
+                    % (tick_rate/1e6)
+                    % (max_tick_rate/1e6)
+                    % chan_count
+                    % direction
+            ));
+        }
+    }
+}
+
+double e300_impl::_set_tick_rate(const double rate)
+{
+    UHD_MSG(status) << "Asking for clock rate " << rate/1e6 << " MHz\n";
+    _tick_rate = _codec_ctrl->set_clock_rate(rate);
+    UHD_MSG(status) << "Actually got clock rate " << _tick_rate/1e6 << " MHz\n";
+
+    BOOST_FOREACH(radio_perifs_t &perif, _radio_perifs)
+    {
+        perif.time64->set_tick_rate(_tick_rate);
+        perif.time64->self_test();
+    }
+    return _tick_rate;
+}
+
+void e300_impl::_load_fpga_image(const std::string &path)
+{
+    if (not fs::exists("/dev/xdevcfg"))
+    {
+        ::system("mknod /dev/xdevcfg c 259 0");
+        //throw uhd::runtime_error("no xdevcfg, please run: mknod /dev/xdevcfg c 259 0");
+    }
+
+    UHD_MSG(status) << "Loading FPGA image: " << path << "..." << std::flush;
+
+    std::ifstream fpga_file(path.c_str(), std::ios_base::binary);
+    UHD_ASSERT_THROW(fpga_file.good());
+
+    std::FILE *wfile;
+    wfile = std::fopen("/dev/xdevcfg", "wb");
+    UHD_ASSERT_THROW(!(wfile == NULL));
+
+    char buff[16384]; // devcfg driver can't handle huge writes
+    do {
+        fpga_file.read(buff, sizeof(buff));
+        std::fwrite(buff, 1, fpga_file.gcount(), wfile);
+    } while (fpga_file);
+
+    fpga_file.close();
+    std::fclose(wfile);
+
+    UHD_MSG(status) << " done" << std::endl;
+}
+
+void e300_impl::_register_loopback_self_test(wb_iface::sptr iface)
+{
+    bool test_fail = false;
+    UHD_MSG(status) << "Performing register loopback test... " << std::flush;
+    size_t hash = time(NULL);
+    for (size_t i = 0; i < 100; i++)
+    {
+        boost::hash_combine(hash, i);
+        iface->poke32(TOREG(SR_TEST), boost::uint32_t(hash));
+        test_fail = iface->peek32(RB32_TEST) != boost::uint32_t(hash);
+        if (test_fail) break; //exit loop on any failure
+    }
+    UHD_MSG(status) << ((test_fail)? " fail" : "pass") << std::endl;
+}
+
+boost::uint32_t e300_impl::_get_version(compat_t which)
+{
+    const boost::uint16_t compat_num
+        = _global_regs->peek32(global_regs::RB32_CORE_COMPAT);
+
+    switch(which) {
+    case FPGA_MINOR:
+        return compat_num & 0xff;
+    case FPGA_MAJOR:
+        return (compat_num & 0xff00) >> 8;
+    default:
+        throw uhd::value_error("Requested unknown version.");
+    };
+}
+
+std::string e300_impl::_get_version_hash(void)
+{
+    const boost::uint32_t git_hash
+        = _global_regs->peek32(global_regs::RB32_CORE_GITHASH);
+    return str(boost::format("%7x%s")
+        % (git_hash & 0x0FFFFFFF)
+        % ((git_hash & 0xF000000) ? "-dirty" : ""));
+}
+
+void e300_impl::_codec_loopback_self_test(wb_iface::sptr iface)
+{
+    bool test_fail = false;
+    UHD_ASSERT_THROW(bool(iface));
+    UHD_MSG(status) << "Performing CODEC loopback test... " << std::flush;
+    size_t hash = time(NULL);
+    for (size_t i = 0; i < 100; i++)
+    {
+        boost::hash_combine(hash, i);
+        const boost::uint32_t word32 = boost::uint32_t(hash) & 0xfff0fff0;
+        iface->poke32(TOREG(SR_CODEC_IDLE), word32);
+        iface->peek64(RB64_CODEC_READBACK); //enough idleness for loopback to propagate
+        const boost::uint64_t rb_word64 = iface->peek64(RB64_CODEC_READBACK);
+        const boost::uint32_t rb_tx = boost::uint32_t(rb_word64 >> 32);
+        const boost::uint32_t rb_rx = boost::uint32_t(rb_word64 & 0xffffffff);
+        test_fail = word32 != rb_tx or word32 != rb_rx;
+        if (test_fail) break; //exit loop on any failure
+    }
+    UHD_MSG(status) << ((test_fail)? " fail" : "pass") << std::endl;
+
+    /* Zero out the idle data. */
+    iface->poke32(TOREG(SR_CODEC_IDLE), 0);
+}
+
+boost::uint32_t e300_impl::_allocate_sid(const sid_config_t &config)
+{
+    const boost::uint32_t stream = (config.dst_prefix | (config.router_dst_there << 2)) & 0xff;
+
+    const boost::uint32_t sid = 0
+        | (E300_DEVICE_HERE << 24)
+        | (_sid_framer << 16)
+        | (config.router_addr_there << 8)
+        | (stream << 0)
+    ;
+    UHD_LOG << std::hex
+        << " sid 0x" << sid
+        << " framer 0x" << _sid_framer
+        << " stream 0x" << stream
+        << " router_dst_there 0x" << int(config.router_dst_there)
+        << " router_addr_there 0x" << int(config.router_addr_there)
+        << std::dec << std::endl;
+
+    // Program the E300 to recognize it's own local address.
+    _global_regs->poke32(global_regs::SR_CORE_XB_LOCAL, config.router_addr_there);
+
+    // Program CAM entry for outgoing packets matching a E300 resource (e.g. Radio).
+    // This type of packet matches the XB_LOCAL address and is looked up in the upper
+    // half of the CAM
+    _global_regs->poke32(XB_ADDR(256 + stream),
+                         config.router_dst_there);
+
+    // Program CAM entry for returning packets to us (for example GR host via zynq_fifo)
+    // This type of packet does not match the XB_LOCAL address and is looked up in the lower half of the CAM
+    _global_regs->poke32(XB_ADDR(E300_DEVICE_HERE),
+                         config.router_dst_here);
+
+    UHD_LOG << std::hex
+        << "done router config for sid 0x" << sid
+        << std::dec << std::endl;
+
+    //increment for next setup
+    _sid_framer++;
+
+    return sid;
+}
+
+void e300_impl::_setup_dest_mapping(const boost::uint32_t sid, const size_t which_stream)
+{
+    UHD_LOG << boost::format("Setting up dest map for 0x%lx to be stream %d")
+                                     % (sid & 0xff) % which_stream << std::endl;
+    _global_regs->poke32(DST_ADDR(sid & 0xff), which_stream);
+}
+
+void e300_impl::_update_time_source(const std::string &source)
+{
+    UHD_MSG(status) << boost::format("Setting time source to %s") % source << std::endl;
+    if (source == "none" or source == "internal") {
+        _misc.pps_sel = global_regs::PPS_INT;
+    } else if (source == "gpsdo") {
+        _misc.pps_sel = global_regs::PPS_GPS;
+    } else if (source == "external") {
+        _misc.pps_sel = global_regs::PPS_EXT;
+    } else {
+        throw uhd::key_error("update_time_source: unknown source: " + source);
+    }
+    _update_gpio_state();
+}
+
+size_t e300_impl::_get_axi_dma_channel(
+    boost::uint8_t destination,
+    boost::uint8_t prefix)
+{
+    static const boost::uint32_t RADIO_GRP_SIZE = 4;
+    static const boost::uint32_t RADIO0_GRP     = 0;
+    static const boost::uint32_t RADIO1_GRP     = 1;
+
+    boost::uint32_t radio_grp = (destination == E300_XB_DST_R0) ? RADIO0_GRP : RADIO1_GRP;
+    return ((radio_grp * RADIO_GRP_SIZE) + prefix);
+}
+
+boost::uint16_t e300_impl::_get_udp_port(
+        boost::uint8_t destination,
+        boost::uint8_t prefix)
+{
+    if (destination == E300_XB_DST_R0) {
+        if (prefix == E300_RADIO_DEST_PREFIX_CTRL)
+            return boost::lexical_cast<boost::uint16_t>(E300_SERVER_CTRL_PORT0);
+        else if (prefix == E300_RADIO_DEST_PREFIX_TX)
+            return boost::lexical_cast<boost::uint16_t>(E300_SERVER_TX_PORT0);
+        else if (prefix == E300_RADIO_DEST_PREFIX_RX)
+            return boost::lexical_cast<boost::uint16_t>(E300_SERVER_RX_PORT0);
+    } else if (destination == E300_XB_DST_R1) {
+        if (prefix == E300_RADIO_DEST_PREFIX_CTRL)
+            return boost::lexical_cast<boost::uint16_t>(E300_SERVER_CTRL_PORT1);
+        else if (prefix == E300_RADIO_DEST_PREFIX_TX)
+            return boost::lexical_cast<boost::uint16_t>(E300_SERVER_TX_PORT1);
+        else if (prefix == E300_RADIO_DEST_PREFIX_RX)
+            return boost::lexical_cast<boost::uint16_t>(E300_SERVER_RX_PORT1);
+    }
+    throw uhd::value_error(str(boost::format("No UDP port defined for combination: %u %u") % destination % prefix));
+}
+
+e300_impl::both_xports_t e300_impl::_make_transport(
+    const boost::uint8_t &destination,
+    const boost::uint8_t &prefix,
+    const uhd::transport::zero_copy_xport_params &params,
+    boost::uint32_t &sid)
+{
+    both_xports_t xports;
+
+    sid_config_t config;
+    config.router_addr_there    = E300_DEVICE_THERE;
+    config.dst_prefix           = prefix;
+    config.router_dst_there     = destination;
+    config.router_dst_here      = E300_XB_DST_AXI;
+    sid = this->_allocate_sid(config);
+
+    // in local mode
+    if (_xport_path == AXI) {
+        // lookup which dma channel we need
+        // to use to create our transport
+        const size_t stream = _get_axi_dma_channel(
+            destination,
+            prefix);
+
+        xports.send =
+            _fifo_iface->make_send_xport(stream, params);
+        xports.recv =
+            _fifo_iface->make_recv_xport(stream, params);
+
+    // in network mode
+    } else if (_xport_path == ETH) {
+        // lookup which udp port we need
+        // to use to create our transport
+        const boost::uint16_t port = _get_udp_port(
+            destination,
+            prefix);
+
+        udp_zero_copy::buff_params dummy_buff_params_out;
+        xports.send = udp_zero_copy::make(
+            _device_addr["addr"],
+            str(boost::format("%u") % port), params,
+            dummy_buff_params_out,
+            _device_addr);
+
+        // use the same xport in both directions
+        xports.recv = xports.send;
+    }
+
+    // configure the return path
+    _setup_dest_mapping(sid, _get_axi_dma_channel(destination, prefix));
+
+    return xports;
+}
+
+void e300_impl::_update_clock_source(const std::string &)
+{
+}
+
+void e300_impl::_update_antenna_sel(const size_t &which, const std::string &ant)
+{
+    if (ant != "TX/RX" and ant != "RX2")
+        throw uhd::value_error("e300: unknown RX antenna option: " + ant);
+    _radio_perifs[which].ant_rx2 = (ant == "RX2");
+    this->_update_atrs();
+}
+
+void e300_impl::_update_fe_lo_freq(const std::string &fe, const double freq)
+{
+    if (fe[0] == 'R')
+        _settings.rx_freq = freq;
+    if (fe[0] == 'T')
+        _settings.tx_freq = freq;
+    this->_update_atrs();
+    _update_bandsel(fe, freq);
+}
+
+void e300_impl::_setup_radio(const size_t dspno)
+{
+    radio_perifs_t &perif = _radio_perifs[dspno];
+    const fs_path mb_path = "/mboards/0";
+
+    ////////////////////////////////////////////////////////////////////
+    // crossbar config for ctrl xports
+    ////////////////////////////////////////////////////////////////////
+
+    // make a transport, grab a sid
+    boost::uint32_t ctrl_sid;
+    both_xports_t ctrl_xports = _make_transport(
+       dspno ? E300_XB_DST_R1 : E300_XB_DST_R0,
+       E300_RADIO_DEST_PREFIX_CTRL,
+       _ctrl_xport_params,
+       ctrl_sid);
+
+    this->_setup_dest_mapping(
+        ctrl_sid,
+        dspno ? E300_R1_CTRL_STREAM
+              : E300_R0_CTRL_STREAM);
+
+    ////////////////////////////////////////////////////////////////////
+    // radio control
+    ////////////////////////////////////////////////////////////////////
+    perif.ctrl = radio_ctrl_core_3000::make(
+        false/*lilE*/,
+        ctrl_xports.send,
+        ctrl_xports.recv,
+        ctrl_sid,
+        dspno ? "1" : "0");
+    this->_register_loopback_self_test(perif.ctrl);
+    perif.atr = gpio_core_200_32wo::make(perif.ctrl, TOREG(SR_GPIO));
+
+    ////////////////////////////////////////////////////////////////////
+    // front end corrections
+    ////////////////////////////////////////////////////////////////////
+    std::string slot_name = (dspno == 0) ? "A" : "B";
+    perif.rx_fe = rx_frontend_core_200::make(perif.ctrl, TOREG(SR_RX_FRONT));
+    const fs_path rx_fe_path = mb_path / "rx_frontends" / slot_name;
+    _tree->create<std::complex<double> >(rx_fe_path / "dc_offset" / "value")
+        .coerce(boost::bind(&rx_frontend_core_200::set_dc_offset, perif.rx_fe, _1))
+        .set(std::complex<double>(0.0, 0.0));
+    _tree->create<bool>(rx_fe_path / "dc_offset" / "enable")
+        .subscribe(boost::bind(&rx_frontend_core_200::set_dc_offset_auto, perif.rx_fe, _1))
+        .set(true);
+    _tree->create<std::complex<double> >(rx_fe_path / "iq_balance" / "value")
+        .subscribe(boost::bind(&rx_frontend_core_200::set_iq_balance, perif.rx_fe, _1))
+        .set(std::complex<double>(0.0, 0.0));
+
+    perif.tx_fe = tx_frontend_core_200::make(perif.ctrl, TOREG(SR_TX_FRONT));
+    const fs_path tx_fe_path = mb_path / "tx_frontends" / slot_name;
+    _tree->create<std::complex<double> >(tx_fe_path / "dc_offset" / "value")
+        .coerce(boost::bind(&tx_frontend_core_200::set_dc_offset, perif.tx_fe, _1))
+        .set(std::complex<double>(0.0, 0.0));
+    _tree->create<std::complex<double> >(tx_fe_path / "iq_balance" / "value")
+        .subscribe(boost::bind(&tx_frontend_core_200::set_iq_balance, perif.tx_fe, _1))
+        .set(std::complex<double>(0.0, 0.0));
+
+    ////////////////////////////////////////////////////////////////////
+    // create rx dsp control objects
+    ////////////////////////////////////////////////////////////////////
+    perif.framer = rx_vita_core_3000::make(perif.ctrl, TOREG(SR_RX_CTRL));
+    perif.ddc = rx_dsp_core_3000::make(perif.ctrl, TOREG(SR_RX_DSP));
+    perif.ddc->set_link_rate(10e9/8); //whatever
+    _tree->access<double>(mb_path / "tick_rate")
+        .subscribe(boost::bind(&rx_vita_core_3000::set_tick_rate, perif.framer, _1))
+        .subscribe(boost::bind(&rx_dsp_core_3000::set_tick_rate, perif.ddc, _1));
+    const fs_path rx_dsp_path = mb_path / "rx_dsps" / str(boost::format("%u") % dspno);
+    _tree->create<meta_range_t>(rx_dsp_path / "rate" / "range")
+        .publish(boost::bind(&rx_dsp_core_3000::get_host_rates, perif.ddc));
+    _tree->create<double>(rx_dsp_path / "rate" / "value")
+        .coerce(boost::bind(&rx_dsp_core_3000::set_host_rate, perif.ddc, _1))
+        .subscribe(boost::bind(&e300_impl::_update_rx_samp_rate, this, dspno, _1))
+        .set(e300::DEFAULT_RX_SAMP_RATE);
+    _tree->create<double>(rx_dsp_path / "freq" / "value")
+        .coerce(boost::bind(&rx_dsp_core_3000::set_freq, perif.ddc, _1))
+        .set(e300::DEFAULT_DDC_FREQ);
+    _tree->create<meta_range_t>(rx_dsp_path / "freq" / "range")
+        .publish(boost::bind(&rx_dsp_core_3000::get_freq_range, perif.ddc));
+    _tree->create<stream_cmd_t>(rx_dsp_path / "stream_cmd")
+        .subscribe(boost::bind(&rx_vita_core_3000::issue_stream_command, perif.framer, _1));
+
+    ////////////////////////////////////////////////////////////////////
+    // create tx dsp control objects
+    ////////////////////////////////////////////////////////////////////
+    perif.deframer = tx_vita_core_3000::make(perif.ctrl, TOREG(SR_TX_CTRL));
+    perif.duc = tx_dsp_core_3000::make(perif.ctrl, TOREG(SR_TX_DSP));
+    perif.duc->set_link_rate(10e9/8); //whatever
+    _tree->access<double>(mb_path / "tick_rate")
+        .subscribe(boost::bind(&tx_vita_core_3000::set_tick_rate, perif.deframer, _1))
+        .subscribe(boost::bind(&tx_dsp_core_3000::set_tick_rate, perif.duc, _1));
+    const fs_path tx_dsp_path = mb_path / "tx_dsps" / str(boost::format("%u") % dspno);
+    _tree->create<meta_range_t>(tx_dsp_path / "rate" / "range")
+        .publish(boost::bind(&tx_dsp_core_3000::get_host_rates, perif.duc));
+    _tree->create<double>(tx_dsp_path / "rate" / "value")
+        .coerce(boost::bind(&tx_dsp_core_3000::set_host_rate, perif.duc, _1))
+        .subscribe(boost::bind(&e300_impl::_update_tx_samp_rate, this, dspno, _1))
+        .set(e300::DEFAULT_TX_SAMP_RATE);
+    _tree->create<double>(tx_dsp_path / "freq" / "value")
+        .coerce(boost::bind(&tx_dsp_core_3000::set_freq, perif.duc, _1))
+        .set(e300::DEFAULT_DUC_FREQ);
+    _tree->create<meta_range_t>(tx_dsp_path / "freq" / "range")
+        .publish(boost::bind(&tx_dsp_core_3000::get_freq_range, perif.duc));
+
+    ////////////////////////////////////////////////////////////////////
+    // create time control objects
+    ////////////////////////////////////////////////////////////////////
+    time_core_3000::readback_bases_type time64_rb_bases;
+    time64_rb_bases.rb_now = RB64_TIME_NOW;
+    time64_rb_bases.rb_pps = RB64_TIME_PPS;
+    perif.time64 = time_core_3000::make(perif.ctrl, TOREG(SR_TIME), time64_rb_bases);
+
+    ////////////////////////////////////////////////////////////////////
+    // create RF frontend interfacing
+    ////////////////////////////////////////////////////////////////////
+    static const std::vector<std::string> data_directions = boost::assign::list_of("rx")("tx");
+    BOOST_FOREACH(const std::string& direction, data_directions)
+    {
+        const std::string key = boost::to_upper_copy(direction) + std::string(((dspno == FE0)? "1" : "2"));
+        const fs_path rf_fe_path
+            = mb_path / "dboards" / "A" / (direction + "_frontends") / ((dspno == 0) ? "A" : "B");
+
+        _tree->create<std::string>(rf_fe_path / "name").set("FE-"+key);
+        _tree->create<int>(rf_fe_path / "sensors"); //empty TODO
+        _tree->create<sensor_value_t>(rf_fe_path / "sensors" / "lo_locked")
+            .publish(boost::bind(&e300_impl::_get_fe_pll_lock, this, direction == "tx"));
+        BOOST_FOREACH(const std::string &name, ad9361_ctrl::get_gain_names(key))
+        {
+            _tree->create<meta_range_t>(rf_fe_path / "gains" / name / "range")
+                .set(ad9361_ctrl::get_gain_range(key));
+
+            _tree->create<double>(rf_fe_path / "gains" / name / "value")
+                .coerce(boost::bind(&ad9361_ctrl::set_gain, _codec_ctrl, key, _1))
+                .set(e300::DEFAULT_FE_GAIN);
+        }
+        _tree->create<std::string>(rf_fe_path / "connection").set("IQ");
+        _tree->create<bool>(rf_fe_path / "enabled").set(true);
+        _tree->create<bool>(rf_fe_path / "use_lo_offset").set(false);
+        _tree->create<double>(rf_fe_path / "bandwidth" / "value")
+            .coerce(boost::bind(&ad9361_ctrl::set_bw_filter, _codec_ctrl, key, _1))
+            .set(e300::DEFAULT_FE_BW);
+        _tree->create<meta_range_t>(rf_fe_path / "bandwidth" / "range")
+            .publish(boost::bind(&ad9361_ctrl::get_bw_filter_range, key));
+        _tree->create<double>(rf_fe_path / "freq" / "value")
+            .coerce(boost::bind(&ad9361_ctrl::tune, _codec_ctrl, key, _1))
+            .subscribe(boost::bind(&e300_impl::_update_fe_lo_freq, this, key, _1))
+            .set(e300::DEFAULT_FE_FREQ);
+        _tree->create<meta_range_t>(rf_fe_path / "freq" / "range")
+            .publish(boost::bind(&ad9361_ctrl::get_rf_freq_range));
+
+        //setup antenna stuff
+        if (key[0] == 'R') {
+            static const std::vector<std::string> ants = boost::assign::list_of("TX/RX")("RX2");
+            _tree->create<std::vector<std::string> >(rf_fe_path / "antenna" / "options").set(ants);
+            _tree->create<std::string>(rf_fe_path / "antenna" / "value")
+                .subscribe(boost::bind(&e300_impl::_update_antenna_sel, this, dspno, _1))
+                .set("RX2");
+
+        }
+        if (key[0] == 'T') {
+            static const std::vector<std::string> ants(1, "TX/RX");
+            _tree->create<std::vector<std::string> >(rf_fe_path / "antenna" / "options").set(ants);
+            _tree->create<std::string>(rf_fe_path / "antenna" / "value").set("TX/RX");
+        }
+    }
+}
+
+void e300_impl::_update_enables(void)
+{
+    //extract settings from state variables
+    const bool enb_tx1 = bool(_radio_perifs[FE0].tx_streamer.lock());
+    const bool enb_rx1 = bool(_radio_perifs[FE0].rx_streamer.lock());
+    const bool enb_tx2 = bool(_radio_perifs[FE1].tx_streamer.lock());
+    const bool enb_rx2 = bool(_radio_perifs[FE1].rx_streamer.lock());
+    const size_t num_rx = (enb_rx1 ? 1 : 0) + (enb_rx2 ? 1:0);
+    const size_t num_tx = (enb_tx1 ? 1 : 0) + (enb_tx2 ? 1:0);
+    const bool mimo = num_rx == 2 or num_tx == 2;
+
+    //setup the active chains in the codec
+    _codec_ctrl->set_active_chains(enb_tx1, enb_tx2, enb_rx1, enb_rx2);
+    if ((num_rx + num_tx) == 0)
+        _codec_ctrl->set_active_chains(
+            true, false, true, false); // enable something
+
+    //set_active_chains could cause a clock rate change - reset dcm
+    _reset_codec_mmcm();
+
+    //figure out if mimo is enabled based on new state
+    _misc.mimo = (mimo)? 1 : 0;
+    _update_gpio_state();
+
+    //atrs change based on enables
+    _update_atrs();
+}
+
+void e300_impl::_update_gpio_state(void)
+{
+    boost::uint32_t misc_reg = 0
+        | (_misc.pps_sel      << gpio_t::PPS_SEL)
+        | (_misc.mimo         << gpio_t::MIMO)
+        | (_misc.codec_arst   << gpio_t::CODEC_ARST)
+        | (_misc.tx_bandsels  << gpio_t::TX_BANDSEL)
+        | (_misc.rx_bandsel_a << gpio_t::RX_BANDSELA)
+        | (_misc.rx_bandsel_b << gpio_t::RX_BANDSELB)
+        | (_misc.rx_bandsel_c << gpio_t::RX_BANDSELC);
+    _global_regs->poke32(global_regs::SR_CORE_MISC, misc_reg);
+}
+
+void e300_impl::_reset_codec_mmcm(void)
+{
+    _misc.codec_arst = 1;
+    _update_gpio_state();
+    boost::this_thread::sleep(boost::posix_time::milliseconds(10));
+    _misc.codec_arst = 0;
+    _update_gpio_state();
+}
+
+////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////
+//////////////// ATR SETUP FOR FRONTEND CONTROL VIA GPIO ///////////////
+////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////
+
+void e300_impl::_update_bandsel(const std::string& which, double freq)
+{
+    if(which[0] == 'R') {
+        if (freq < 450e6) {
+            _misc.rx_bandsel_a  = 44; // 4 | (5 << 3)
+            _misc.rx_bandsel_b  = 0;  // 0 | (0 << 2)
+            _misc.rx_bandsel_c  = 6;  // 2 | (1 << 2)
+        } else if (freq < 700e6) {
+            _misc.rx_bandsel_a  = 26; // 2 | (3 << 3)
+            _misc.rx_bandsel_b  = 0;  // 0 | (0 << 2)
+            _misc.rx_bandsel_c  = 15; // 3 | (3 << 2)
+        } else if (freq < 1200e6) {
+            _misc.rx_bandsel_a  = 8; // 0 | (1 << 3)
+            _misc.rx_bandsel_b  = 0; // 0 | (0 << 2)
+            _misc.rx_bandsel_c  = 9; // 1 | (2 << 2)
+        } else if (freq < 1800e6) {
+            _misc.rx_bandsel_a  = 1; // 1 | (0 << 3)
+            _misc.rx_bandsel_b  = 6; // 2 | (1 << 2)
+            _misc.rx_bandsel_c  = 0; // 0 | (0 << 2)
+        } else if (freq < 2350e6){
+            _misc.rx_bandsel_a  = 19; // 3 | (2 << 3)
+            _misc.rx_bandsel_b  = 15; // 3 | (3 << 2)
+            _misc.rx_bandsel_c  = 0;  // 0 | (0 << 2)
+        } else if (freq < 2600e6){
+            _misc.rx_bandsel_a  = 37; // 5 | (4 << 3)
+            _misc.rx_bandsel_b  = 9;  // 1 | (2 << 2)
+            _misc.rx_bandsel_c  = 0;  // 0 | (0 << 2)
+        } else {
+            _misc.rx_bandsel_a  = 0;
+            _misc.rx_bandsel_b  = 0;
+            _misc.rx_bandsel_c  = 0;
+        }
+        _update_gpio_state();
+    } else if(which[0] == 'T') {
+        if (freq < 117.7e6)
+            _misc.tx_bandsels = 7;
+        else if (freq < 178.2e6)
+            _misc.tx_bandsels = 6;
+        else if (freq < 284.3e6)
+            _misc.tx_bandsels = 5;
+        else if (freq < 453.7e6)
+            _misc.tx_bandsels = 4;
+        else if (freq < 723.8e6)
+            _misc.tx_bandsels = 3;
+        else if (freq < 1154.9e6)
+            _misc.tx_bandsels = 2;
+        else if (freq < 1842.6e6)
+            _misc.tx_bandsels = 1;
+        else if (freq < 2940.0e6)
+            _misc.tx_bandsels = 0;
+        else
+            _misc.tx_bandsels = 7;
+        _update_gpio_state();
+    } else {
+        UHD_THROW_INVALID_CODE_PATH();
+    }
+}
+
+
+void e300_impl::_update_atrs(void)
+{
+    for (size_t instance = 0; instance < fpga::NUM_RADIOS; instance++)
+    {
+        // if we're not ready, no point ...
+        if (not _radio_perifs[instance].atr)
+            return;
+
+        radio_perifs_t &perif = _radio_perifs[instance];
+        const bool enb_rx = bool(perif.rx_streamer.lock());
+        const bool enb_tx = bool(perif.tx_streamer.lock());
+        const bool rx_ant_rx2  = perif.ant_rx2;
+
+        const bool rx_low_band = _settings.rx_freq < 2.6e9;
+        const bool tx_low_band = _settings.tx_freq < 2940.0e6;
+
+        // VCRX
+        int vcrx_v1_rxing = 1;
+        int vcrx_v2_rxing = 0;
+        int vcrx_v1_txing = 1;
+        int vcrx_v2_txing = 0;
+
+        if (rx_low_band) {
+            vcrx_v1_rxing = rx_ant_rx2 ? 0 : 1;
+            vcrx_v2_rxing = rx_ant_rx2 ? 1 : 0;
+            vcrx_v1_txing = 0;
+            vcrx_v2_txing = 1;
+        } else {
+            vcrx_v1_rxing = rx_ant_rx2 ? 1 : 0;
+            vcrx_v2_rxing = rx_ant_rx2 ? 0 : 1;
+            vcrx_v1_txing = 1;
+            vcrx_v2_txing = 0;
+        }
+
+        // VCTX
+        int vctxrx_v1_rxing = 0;
+        int vctxrx_v2_rxing = 1;
+        int vctxrx_v1_txing = 0;
+        int vctxrx_v2_txing = 1;
+
+        if (tx_low_band) {
+            vctxrx_v1_rxing = rx_ant_rx2 ? 0 : 0;
+            vctxrx_v2_rxing = rx_ant_rx2 ? 0 : 1;
+            vctxrx_v1_txing = 1;
+            vctxrx_v2_txing = 0;
+        } else {
+            vctxrx_v1_rxing = rx_ant_rx2 ? 0 : 0;
+            vctxrx_v2_rxing = rx_ant_rx2 ? 0 : 1;
+            vctxrx_v1_txing = 1;
+            vctxrx_v2_txing = 1;
+        }
+        //swapped for routing reasons, reswap it here
+        if (instance == 1) {
+            std::swap(vctxrx_v1_rxing, vctxrx_v2_rxing);
+            std::swap(vctxrx_v1_txing, vctxrx_v2_txing);
+        }
+
+        int tx_enable_a = (!tx_low_band and enb_tx) ? 1 : 0;
+        int tx_enable_b = (tx_low_band and  enb_tx) ? 1 : 0;
+
+        //----------------- LEDS ----------------------------//
+        const int led_rx2  = rx_ant_rx2  ? 1 : 0;
+        const int led_txrx = !rx_ant_rx2 ? 1 : 0;
+        const int led_tx   = 1;
+
+        const int rx_leds = (led_rx2 << LED_RX_RX) | (led_txrx << LED_TXRX_RX);
+        const int tx_leds = (led_tx << LED_TXRX_TX);
+        const int xx_leds = tx_leds | (1 << LED_RX_RX); //forced to rx2
+
+        const int rx_selects = 0
+            | (vcrx_v1_rxing << VCRX_V1)
+            | (vcrx_v2_rxing << VCRX_V2)
+            | (vctxrx_v1_rxing << VCTXRX_V1)
+            | (vctxrx_v2_rxing << VCTXRX_V2)
+        ;
+        const int tx_selects = 0
+            | (vcrx_v1_txing << VCRX_V1)
+            | (vcrx_v2_txing << VCRX_V2)
+            | (vctxrx_v1_txing << VCTXRX_V1)
+            | (vctxrx_v2_txing << VCTXRX_V2)
+        ;
+        const int tx_enables = 0
+            | (tx_enable_a << TX_ENABLEA)
+            | (tx_enable_b << TX_ENABLEB)
+        ;
+
+        //default selects
+        int oo_reg = rx_selects;
+        int rx_reg = rx_selects;
+        int tx_reg = tx_selects;
+        int fd_reg = tx_selects; //tx selects dominate in fd mode
+
+        //add in leds and tx enables based on fe enable
+        if (enb_rx)
+            rx_reg |= rx_leds;
+        if (enb_rx)
+            fd_reg |= xx_leds;
+        if (enb_tx)
+            tx_reg |= tx_enables | tx_leds;
+        if (enb_tx)
+            fd_reg |= tx_enables | xx_leds;
+
+        gpio_core_200_32wo::sptr atr = _radio_perifs[instance].atr;
+        atr->set_atr_reg(dboard_iface::ATR_REG_IDLE, oo_reg);
+        atr->set_atr_reg(dboard_iface::ATR_REG_RX_ONLY, rx_reg);
+        atr->set_atr_reg(dboard_iface::ATR_REG_TX_ONLY, tx_reg);
+        atr->set_atr_reg(dboard_iface::ATR_REG_FULL_DUPLEX, fd_reg);
+    }
+}
+
+}}} // namespace
+
+UHD_STATIC_BLOCK(register_e300_device)
+{
+    device::register_device(&uhd::usrp::e300::e300_find, &uhd::usrp::e300::e300_make, uhd::device::USRP);
+}
diff --git a/host/lib/usrp/e300/e300_impl.hpp b/host/lib/usrp/e300/e300_impl.hpp
new file mode 100644
index 000000000..9cfd80afd
--- /dev/null
+++ b/host/lib/usrp/e300/e300_impl.hpp
@@ -0,0 +1,296 @@
+//
+// Copyright 2013-2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_IMPL_HPP
+#define INCLUDED_E300_IMPL_HPP
+
+#include <uhd/device.hpp>
+#include <uhd/property_tree.hpp>
+#include <uhd/usrp/subdev_spec.hpp>
+#include <uhd/usrp/mboard_eeprom.hpp>
+#include <uhd/usrp/dboard_eeprom.hpp>
+#include <uhd/transport/bounded_buffer.hpp>
+#include <uhd/types/serial.hpp>
+#include <uhd/types/sensors.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/thread/mutex.hpp>
+#include "e300_fifo_config.hpp"
+#include "radio_ctrl_core_3000.hpp"
+#include "rx_frontend_core_200.hpp"
+#include "tx_frontend_core_200.hpp"
+#include "rx_vita_core_3000.hpp"
+#include "tx_vita_core_3000.hpp"
+#include "time_core_3000.hpp"
+#include "rx_dsp_core_3000.hpp"
+#include "tx_dsp_core_3000.hpp"
+#include "ad9361_ctrl.hpp"
+#include "gpio_core_200.hpp"
+
+#include "e300_global_regs.hpp"
+#include "e300_i2c.hpp"
+#include "e300_eeprom_manager.hpp"
+#include "e300_sensor_manager.hpp"
+#include "e300_ublox_control.hpp"
+
+namespace uhd { namespace usrp { namespace e300 {
+
+static const std::string E300_FPGA_FILE_NAME = "usrp_e300_fpga.bit";
+static const std::string E310_FPGA_FILE_NAME = "usrp_e310_fpga.bit";
+
+static const std::string E300_TEMP_SYSFS = "iio:device0";
+static const std::string E300_SPIDEV_DEVICE  = "/dev/spidev0.1";
+static const std::string E300_I2CDEV_DEVICE  = "/dev/i2c-0";
+
+static std::string E300_SERVER_RX_PORT0    = "21756";
+static std::string E300_SERVER_TX_PORT0    = "21757";
+static std::string E300_SERVER_CTRL_PORT0  = "21758";
+
+static std::string E300_SERVER_RX_PORT1    = "21856";
+static std::string E300_SERVER_TX_PORT1    = "21857";
+static std::string E300_SERVER_CTRL_PORT1  = "21858";
+
+
+static std::string E300_SERVER_CODEC_PORT  = "21759";
+static std::string E300_SERVER_GREGS_PORT  = "21760";
+static std::string E300_SERVER_I2C_PORT    = "21761";
+static std::string E300_SERVER_SENSOR_PORT = "21762";
+
+static const double E300_RX_SW_BUFF_FULLNESS = 0.9;        //Buffer should be half full
+
+// crossbar settings
+static const boost::uint8_t E300_RADIO_DEST_PREFIX_TX   = 0;
+static const boost::uint8_t E300_RADIO_DEST_PREFIX_CTRL = 1;
+static const boost::uint8_t E300_RADIO_DEST_PREFIX_RX   = 2;
+
+static const boost::uint8_t E300_XB_DST_AXI = 0;
+static const boost::uint8_t E300_XB_DST_R0  = 1;
+static const boost::uint8_t E300_XB_DST_R1  = 2;
+static const boost::uint8_t E300_XB_DST_CE0 = 3;
+static const boost::uint8_t E300_XB_DST_CE1 = 4;
+
+static const boost::uint8_t E300_DEVICE_THERE = 2;
+static const boost::uint8_t E300_DEVICE_HERE  = 0;
+
+static const size_t E300_R0_CTRL_STREAM    = (0 << 2) | E300_RADIO_DEST_PREFIX_CTRL;
+static const size_t E300_R0_TX_DATA_STREAM = (0 << 2) | E300_RADIO_DEST_PREFIX_TX;
+static const size_t E300_R0_RX_DATA_STREAM = (0 << 2) | E300_RADIO_DEST_PREFIX_RX;
+
+static const size_t E300_R1_CTRL_STREAM    = (1 << 2) | E300_RADIO_DEST_PREFIX_CTRL;
+static const size_t E300_R1_TX_DATA_STREAM = (1 << 2) | E300_RADIO_DEST_PREFIX_TX;
+static const size_t E300_R1_RX_DATA_STREAM = (1 << 2) | E300_RADIO_DEST_PREFIX_RX;
+
+
+/*!
+ * USRP-E300 implementation guts:
+ * The implementation details are encapsulated here.
+ * Handles properties on the mboard, dboard, dsps...
+ */
+class e300_impl : public uhd::device
+{
+public:
+    //structors
+    e300_impl(const uhd::device_addr_t &);
+    virtual ~e300_impl(void);
+
+    //the io interface
+    boost::mutex _stream_spawn_mutex;
+    uhd::rx_streamer::sptr get_rx_stream(const uhd::stream_args_t &);
+    uhd::tx_streamer::sptr get_tx_stream(const uhd::stream_args_t &);
+
+    typedef uhd::transport::bounded_buffer<uhd::async_metadata_t> async_md_type;
+    boost::shared_ptr<async_md_type> _async_md;
+
+    bool recv_async_msg(uhd::async_metadata_t &, double);
+
+private: // types
+    // sid convenience struct
+    struct sid_config_t
+    {
+        boost::uint8_t router_addr_there;
+        boost::uint8_t dst_prefix; //2bits
+        boost::uint8_t router_dst_there;
+        boost::uint8_t router_dst_here;
+    };
+
+    // perifs in the radio core
+    struct radio_perifs_t
+    {
+        radio_ctrl_core_3000::sptr ctrl;
+        gpio_core_200_32wo::sptr atr;
+        time_core_3000::sptr time64;
+        rx_vita_core_3000::sptr framer;
+        rx_dsp_core_3000::sptr ddc;
+        tx_vita_core_3000::sptr deframer;
+        tx_dsp_core_3000::sptr duc;
+        rx_frontend_core_200::sptr rx_fe;
+        tx_frontend_core_200::sptr tx_fe;
+
+        boost::weak_ptr<uhd::rx_streamer> rx_streamer;
+        boost::weak_ptr<uhd::tx_streamer> tx_streamer;
+
+        bool ant_rx2;
+    };
+
+    //frontend cache so we can update gpios
+    struct fe_control_settings_t
+    {
+        fe_control_settings_t(void)
+        {
+            rx_freq = 1e9;
+            tx_freq = 1e9;
+        }
+        double rx_freq;
+        double tx_freq;
+    };
+
+    // convenience struct
+    struct both_xports_t
+    {
+        uhd::transport::zero_copy_if::sptr recv;
+        uhd::transport::zero_copy_if::sptr send;
+    };
+
+    enum xport_t {AXI, ETH};
+
+    enum compat_t {FPGA_MAJOR, FPGA_MINOR};
+
+    struct gpio_t
+    {
+        gpio_t() : pps_sel(global_regs::PPS_INT),
+            mimo(0), codec_arst(0), tx_bandsels(0),
+            rx_bandsel_a(0), rx_bandsel_b(0), rx_bandsel_c(0)
+        {}
+
+        boost::uint32_t pps_sel;
+        boost::uint32_t mimo;
+        boost::uint32_t codec_arst;
+
+        boost::uint32_t tx_bandsels;
+        boost::uint32_t rx_bandsel_a;
+        boost::uint32_t rx_bandsel_b;
+        boost::uint32_t rx_bandsel_c;
+
+        static const size_t PPS_SEL     = 0;
+        static const size_t MIMO        = 2;
+        static const size_t CODEC_ARST  = 3;
+        static const size_t TX_BANDSEL  = 4;
+        static const size_t RX_BANDSELA = 7;
+        static const size_t RX_BANDSELB = 13;
+        static const size_t RX_BANDSELC = 17;
+    };
+
+private: // methods
+    void _load_fpga_image(const std::string &path);
+
+    void _register_loopback_self_test(uhd::wb_iface::sptr iface);
+
+    boost::uint32_t _get_version(compat_t which);
+    std::string _get_version_hash(void);
+
+    void _setup_radio(const size_t which_radio);
+
+    boost::uint32_t _allocate_sid(const sid_config_t &config);
+
+    void _setup_dest_mapping(
+        const boost::uint32_t sid,
+        const size_t which_stream);
+
+    size_t _get_axi_dma_channel(
+        boost::uint8_t destination,
+        boost::uint8_t prefix);
+
+    boost::uint16_t _get_udp_port(
+        boost::uint8_t destination,
+        boost::uint8_t prefix);
+
+    both_xports_t _make_transport(
+        const boost::uint8_t &destination,
+        const boost::uint8_t &prefix,
+        const uhd::transport::zero_copy_xport_params &params,
+        boost::uint32_t &sid);
+
+    double _get_tick_rate(void){return _tick_rate;}
+    double _set_tick_rate(const double rate);
+
+    void _update_gpio_state(void);
+    void _update_enables(void);
+    void _reset_codec_mmcm(void);
+    void _update_bandsel(const std::string& which, double freq);
+
+    void _check_tick_rate_with_current_streamers(const double rate);
+    void _enforce_tick_rate_limits(
+        const size_t change,
+        const double tick_rate,
+        const std::string &direction);
+
+    void _update_tick_rate(const double);
+    void _update_rx_samp_rate(const size_t, const double);
+    void _update_tx_samp_rate(const size_t, const double);
+
+    void _update_time_source(const std::string &source);
+    void _update_clock_source(const std::string &);
+
+    void _update_subdev_spec(
+        const std::string &txrx,
+        const uhd::usrp::subdev_spec_t &spec);
+
+    void _codec_loopback_self_test(uhd::wb_iface::sptr iface);
+
+    void _update_atrs(void);
+    void _update_antenna_sel(const size_t &fe, const std::string &ant);
+    void _update_fe_lo_freq(const std::string &fe, const double freq);
+
+    // overflow handling is special for MIMO case
+    void _handle_overflow(
+        radio_perifs_t &perif,
+        boost::weak_ptr<uhd::rx_streamer> streamer);
+
+
+    // get frontend lock sensor
+    uhd::sensor_value_t _get_fe_pll_lock(const bool is_tx);
+
+    // internal gpios
+    boost::uint8_t _get_internal_gpio(
+        gpio_core_200::sptr,
+        const std::string &);
+
+    void _set_internal_gpio(
+        gpio_core_200::sptr gpio,
+        const std::string &attr,
+        const boost::uint32_t value);
+
+private: // members
+    uhd::device_addr_t                     _device_addr;
+    xport_t                                _xport_path;
+    e300_fifo_interface::sptr              _fifo_iface;
+    size_t                                 _sid_framer;
+    radio_perifs_t                         _radio_perifs[2];
+    double                                 _tick_rate;
+    ad9361_ctrl::sptr                      _codec_ctrl;
+    fe_control_settings_t                  _settings;
+    global_regs::sptr                      _global_regs;
+    e300_sensor_manager::sptr              _sensor_manager;
+    e300_eeprom_manager::sptr              _eeprom_manager;
+    uhd::transport::zero_copy_xport_params _data_xport_params;
+    uhd::transport::zero_copy_xport_params _ctrl_xport_params;
+    gpio_t                                 _misc;
+    gps::ublox::ubx::control::sptr _gps;
+};
+
+}}} // namespace
+
+#endif /* INCLUDED_E300_IMPL_HPP */
diff --git a/host/lib/usrp/e300/e300_io_impl.cpp b/host/lib/usrp/e300/e300_io_impl.cpp
new file mode 100644
index 000000000..dcb6f2afe
--- /dev/null
+++ b/host/lib/usrp/e300/e300_io_impl.cpp
@@ -0,0 +1,599 @@
+//
+// Copyright 2013-2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "e300_regs.hpp"
+#include "e300_impl.hpp"
+#include "e300_fpga_defs.hpp"
+#include "validate_subdev_spec.hpp"
+#include "../../transport/super_recv_packet_handler.hpp"
+#include "../../transport/super_send_packet_handler.hpp"
+#include "async_packet_handler.hpp"
+#include <uhd/transport/bounded_buffer.hpp>
+#include <boost/bind.hpp>
+#include <uhd/utils/tasks.hpp>
+#include <boost/foreach.hpp>
+#include <boost/make_shared.hpp>
+
+using namespace uhd;
+using namespace uhd::usrp;
+using namespace uhd::transport;
+
+namespace uhd { namespace usrp { namespace e300 {
+
+static const boost::uint32_t HW_SEQ_NUM_MASK = 0xfff;
+
+/***********************************************************************
+ * update streamer rates
+ **********************************************************************/
+void e300_impl::_check_tick_rate_with_current_streamers(const double rate)
+{
+    size_t max_tx_chan_count = 0, max_rx_chan_count = 0;
+    BOOST_FOREACH(radio_perifs_t &perif, _radio_perifs)
+    {
+        {
+            boost::shared_ptr<sph::recv_packet_streamer> rx_streamer =
+                boost::dynamic_pointer_cast<sph::recv_packet_streamer>(
+                    perif.rx_streamer.lock());
+            if (rx_streamer)
+                max_rx_chan_count = std::max(
+                    max_rx_chan_count,
+                    rx_streamer->get_num_channels());
+        }
+
+        {
+            boost::shared_ptr<sph::send_packet_streamer> tx_streamer =
+                boost::dynamic_pointer_cast<sph::send_packet_streamer>(
+                    perif.tx_streamer.lock());
+            if (tx_streamer)
+                max_tx_chan_count = std::max(
+                    max_tx_chan_count,
+                    tx_streamer->get_num_channels());
+        }
+    }
+    _enforce_tick_rate_limits(max_rx_chan_count, rate, "RX");
+    _enforce_tick_rate_limits(max_tx_chan_count, rate, "TX");
+}
+
+void e300_impl::_update_tick_rate(const double rate)
+{
+    _check_tick_rate_with_current_streamers(rate);
+
+    BOOST_FOREACH(radio_perifs_t &perif, _radio_perifs)
+    {
+        boost::shared_ptr<sph::recv_packet_streamer> my_streamer =
+            boost::dynamic_pointer_cast<sph::recv_packet_streamer>(perif.rx_streamer.lock());
+        if (my_streamer)
+            my_streamer->set_tick_rate(rate);
+        perif.framer->set_tick_rate(_tick_rate);
+    }
+    BOOST_FOREACH(radio_perifs_t &perif, _radio_perifs)
+    {
+        boost::shared_ptr<sph::send_packet_streamer> my_streamer =
+            boost::dynamic_pointer_cast<sph::send_packet_streamer>(perif.tx_streamer.lock());
+        if (my_streamer)
+            my_streamer->set_tick_rate(rate);
+        perif.deframer->set_tick_rate(_tick_rate);
+    }
+}
+
+void e300_impl::_update_rx_samp_rate(const size_t dspno, const double rate)
+{
+    boost::shared_ptr<sph::recv_packet_streamer> my_streamer =
+        boost::dynamic_pointer_cast<sph::recv_packet_streamer>(_radio_perifs[dspno].rx_streamer.lock());
+    if (my_streamer)
+        my_streamer->set_samp_rate(rate);
+}
+
+void e300_impl::_update_tx_samp_rate(const size_t dspno, const double rate)
+{
+    boost::shared_ptr<sph::send_packet_streamer> my_streamer =
+        boost::dynamic_pointer_cast<sph::send_packet_streamer>(_radio_perifs[dspno].tx_streamer.lock());
+    if (my_streamer)
+        my_streamer->set_samp_rate(rate);
+}
+
+/***********************************************************************
+ * frontend selection
+ **********************************************************************/
+void e300_impl::_update_subdev_spec(
+        const std::string &txrx,
+        const uhd::usrp::subdev_spec_t &spec)
+{
+    //sanity checking
+    if (spec.size())
+        validate_subdev_spec(_tree, spec, "rx");
+
+    UHD_ASSERT_THROW(spec.size() <= fpga::NUM_RADIOS);
+
+    if (spec.size() >= 1)
+    {
+        UHD_ASSERT_THROW(spec[0].db_name == "A");
+        UHD_ASSERT_THROW(spec[0].sd_name == "A" or spec[0].sd_name == "B");
+    }
+    if (spec.size() == 2)
+    {
+        UHD_ASSERT_THROW(spec[1].db_name == "A");
+        UHD_ASSERT_THROW(
+            (spec[0].sd_name == "A" and spec[1].sd_name == "B") or
+            (spec[0].sd_name == "B" and spec[1].sd_name == "A")
+        );
+    }
+
+    std::vector<size_t> chan_to_dsp_map(spec.size(), 0);
+    for (size_t i = 0; i < spec.size(); i++)
+        chan_to_dsp_map[i] = (spec[i].sd_name == "A") ? 0 : 1;
+    _tree->access<std::vector<size_t> >("/mboards/0" / (txrx + "_chan_dsp_mapping")).set(chan_to_dsp_map);
+
+    const fs_path mb_path = "/mboards/0";
+
+    if (txrx == "tx") {
+        for (size_t i = 0; i < spec.size(); i++)
+        {
+            const std::string conn = _tree->access<std::string>(
+                mb_path / "dboards" / spec[i].db_name /
+                ("tx_frontends") / spec[i].sd_name / "connection").get();
+            _radio_perifs[i].tx_fe->set_mux(conn);
+        }
+
+    } else {
+        for (size_t i = 0; i < spec.size(); i++)
+        {
+            const std::string conn = _tree->access<std::string>(
+                mb_path / "dboards" / spec[i].db_name /
+                ("rx_frontends") / spec[i].sd_name / "connection").get();
+
+            const bool fe_swapped = (conn == "QI" or conn == "Q");
+            _radio_perifs[i].ddc->set_mux(conn, fe_swapped);
+            _radio_perifs[i].rx_fe->set_mux(fe_swapped);
+        }
+    }
+
+    this->_update_enables();
+}
+
+/***********************************************************************
+ * VITA stuff
+ **********************************************************************/
+static void e300_if_hdr_unpack_le(
+    const boost::uint32_t *packet_buff,
+    vrt::if_packet_info_t &if_packet_info
+){
+    if_packet_info.link_type = vrt::if_packet_info_t::LINK_TYPE_CHDR;
+    return vrt::if_hdr_unpack_le(packet_buff, if_packet_info);
+}
+
+static void e300_if_hdr_pack_le(
+    boost::uint32_t *packet_buff,
+    vrt::if_packet_info_t &if_packet_info
+){
+    if_packet_info.link_type = vrt::if_packet_info_t::LINK_TYPE_CHDR;
+    return vrt::if_hdr_pack_le(packet_buff, if_packet_info);
+}
+
+/***********************************************************************
+ * RX flow control handler
+ **********************************************************************/
+struct e300_rx_fc_cache_t
+{
+    e300_rx_fc_cache_t():
+        last_seq_in(0){}
+    size_t last_seq_in;
+};
+
+void e300_impl::_handle_overflow(
+    radio_perifs_t &perif,
+    boost::weak_ptr<uhd::rx_streamer> streamer)
+{
+    boost::shared_ptr<sph::recv_packet_streamer> my_streamer =
+            boost::dynamic_pointer_cast<sph::recv_packet_streamer>(streamer.lock());
+
+    //If the rx_streamer has expired then overflow handling makes no sense.
+    if (not my_streamer)
+        return;
+
+    if (my_streamer->get_num_channels() == 1) {
+        perif.framer->handle_overflow();
+        return;
+    }
+
+    // MIMO overflow recovery time
+    // find out if we were in continuous mode before stopping
+    const bool in_continuous_streaming_mode = perif.framer->in_continuous_streaming_mode();
+    // stop streaming
+    my_streamer->issue_stream_cmd(stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);
+    // flush transports
+    my_streamer->flush_all(0.001);
+    // restart streaming
+    if (in_continuous_streaming_mode) {
+        stream_cmd_t stream_cmd(stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
+        stream_cmd.stream_now = false;
+        stream_cmd.time_spec = perif.time64->get_time_now() + time_spec_t(0.01);
+        my_streamer->issue_stream_cmd(stream_cmd);
+    }
+}
+
+
+static void handle_rx_flowctrl(
+    const boost::uint32_t sid,
+    zero_copy_if::sptr xport,
+    boost::shared_ptr<e300_rx_fc_cache_t> fc_cache,
+    const size_t last_seq)
+{
+    static const size_t RXFC_PACKET_LEN_IN_WORDS    = 2;
+    static const size_t RXFC_CMD_CODE_OFFSET        = 0;
+    static const size_t RXFC_SEQ_NUM_OFFSET         = 1;
+
+    managed_send_buffer::sptr buff = xport->get_send_buff(1.0);
+    if (not buff)
+    {
+        throw uhd::runtime_error("handle_rx_flowctrl timed out getting a send buffer");
+    }
+    boost::uint32_t *pkt = buff->cast<boost::uint32_t *>();
+
+    //recover seq32
+    size_t& seq_sw = fc_cache->last_seq_in;
+    const size_t seq_hw = seq_sw & HW_SEQ_NUM_MASK;
+    if (last_seq < seq_hw)
+        seq_sw += (HW_SEQ_NUM_MASK + 1);
+    seq_sw &= ~HW_SEQ_NUM_MASK;
+    seq_sw |= last_seq;
+
+    //load packet info
+    vrt::if_packet_info_t packet_info;
+    packet_info.packet_type = vrt::if_packet_info_t::PACKET_TYPE_CONTEXT;
+    packet_info.num_payload_words32 = RXFC_PACKET_LEN_IN_WORDS;
+    packet_info.num_payload_bytes = packet_info.num_payload_words32*sizeof(boost::uint32_t);
+    packet_info.packet_count = seq_sw;
+    packet_info.sob = false;
+    packet_info.eob = false;
+    packet_info.sid = sid;
+    packet_info.has_sid = true;
+    packet_info.has_cid = false;
+    packet_info.has_tsi = false;
+    packet_info.has_tsf = false;
+    packet_info.has_tlr = false;
+
+    //load header
+    e300_if_hdr_pack_le(pkt, packet_info);
+
+    //load payload
+    pkt[packet_info.num_header_words32+RXFC_CMD_CODE_OFFSET] = uhd::htowx<boost::uint32_t>(0);
+    pkt[packet_info.num_header_words32+RXFC_SEQ_NUM_OFFSET] = uhd::htowx<boost::uint32_t>(seq_sw);
+
+    //send the buffer over the interface
+    buff->commit(sizeof(boost::uint32_t)*(packet_info.num_packet_words32));
+}
+
+
+/***********************************************************************
+ * TX flow control handler
+ **********************************************************************/
+struct e300_tx_fc_cache_t
+{
+    e300_tx_fc_cache_t(void):
+        stream_channel(0),
+        device_channel(0),
+        last_seq_out(0),
+        last_seq_ack(0),
+        seq_queue(1){}
+    size_t stream_channel;
+    size_t device_channel;
+    size_t last_seq_out;
+    size_t last_seq_ack;
+    bounded_buffer<size_t> seq_queue;
+    boost::shared_ptr<e300_impl::async_md_type> async_queue;
+    boost::shared_ptr<e300_impl::async_md_type> old_async_queue;
+};
+
+#define E300_ASYNC_EVENT_CODE_FLOW_CTRL 0
+
+typedef boost::function<double(void)> tick_rate_retriever_t;
+
+
+static void handle_tx_async_msgs(boost::shared_ptr<e300_tx_fc_cache_t> fc_cache,
+                                 zero_copy_if::sptr xport,
+                                 boost::function<double(void)> get_tick_rate)
+{
+    managed_recv_buffer::sptr buff = xport->get_recv_buff();
+    if (not buff)
+        return;
+
+    //extract packet info
+    vrt::if_packet_info_t if_packet_info;
+    if_packet_info.num_packet_words32 = buff->size()/sizeof(boost::uint32_t);
+    const boost::uint32_t *packet_buff = buff->cast<const boost::uint32_t *>();
+
+    //unpacking can fail
+    try
+    {
+        e300_if_hdr_unpack_le(packet_buff, if_packet_info);
+    }
+    catch(const std::exception &ex)
+    {
+        UHD_MSG(error) << "Error parsing async message packet: " << ex.what() << std::endl;
+        return;
+    }
+
+    //catch the flow control packets and react
+    if (uhd::wtohx(packet_buff[if_packet_info.num_header_words32+0]) == 0)
+    {
+        const size_t seq = uhd::wtohx(packet_buff[if_packet_info.num_header_words32+1]);
+        fc_cache->seq_queue.push_with_haste(seq);
+        return;
+    }
+
+    //fill in the async metadata
+    async_metadata_t metadata;
+    load_metadata_from_buff(uhd::wtohx<boost::uint32_t>,
+                            metadata, if_packet_info, packet_buff,
+                            get_tick_rate(), fc_cache->stream_channel);
+
+    //The FC response and the burst ack are two indicators that the radio
+    //consumed packets. Use them to update the FC metadata
+    if (metadata.event_code == E300_ASYNC_EVENT_CODE_FLOW_CTRL or
+        metadata.event_code == async_metadata_t::EVENT_CODE_BURST_ACK
+    ) {
+        const size_t seq = metadata.user_payload[0];
+        fc_cache->seq_queue.push_with_pop_on_full(seq);
+    }
+
+    //FC responses don't propagate up to the user so filter them here
+    if (metadata.event_code != E300_ASYNC_EVENT_CODE_FLOW_CTRL) {
+        fc_cache->async_queue->push_with_pop_on_full(metadata);
+        metadata.channel = fc_cache->device_channel;
+        fc_cache->old_async_queue->push_with_pop_on_full(metadata);
+        standard_async_msg_prints(metadata);
+    }
+}
+
+static managed_send_buffer::sptr get_tx_buff_with_flowctrl(
+    task::sptr /*holds ref*/,
+    boost::shared_ptr<e300_tx_fc_cache_t> fc_cache,
+    zero_copy_if::sptr xport,
+    const size_t fc_window,
+    const double timeout
+){
+    while (true)
+    {
+        const size_t delta = (fc_cache->last_seq_out & HW_SEQ_NUM_MASK) - (fc_cache->last_seq_ack & HW_SEQ_NUM_MASK);
+        if ((delta & HW_SEQ_NUM_MASK) <= fc_window)
+            break;
+
+        const bool ok = fc_cache->seq_queue.pop_with_timed_wait(fc_cache->last_seq_ack, timeout);
+        if (not ok)
+            return managed_send_buffer::sptr(); //timeout waiting for flow control
+    }
+
+    managed_send_buffer::sptr buff = xport->get_send_buff(timeout);
+    if (buff) {
+        fc_cache->last_seq_out++; //update seq, this will actually be a send
+    }
+
+    return buff;
+}
+
+/***********************************************************************
+ * Async Data
+ **********************************************************************/
+bool e300_impl::recv_async_msg(
+    async_metadata_t &async_metadata, double timeout
+)
+{
+    return _async_md->pop_with_timed_wait(async_metadata, timeout);
+}
+
+/***********************************************************************
+ * Receive streamer
+ **********************************************************************/
+rx_streamer::sptr e300_impl::get_rx_stream(const uhd::stream_args_t &args_)
+{
+    boost::mutex::scoped_lock lock(_stream_spawn_mutex);
+    stream_args_t args = args_;
+
+    //setup defaults for unspecified values
+    if (not args.otw_format.empty() and args.otw_format != "sc16")
+    {
+        throw uhd::value_error("e300_impl::get_rx_stream only supports otw_format sc16");
+    }
+    args.otw_format = "sc16";
+    args.channels = args.channels.empty()? std::vector<size_t>(1, 0) : args.channels;
+
+    boost::shared_ptr<sph::recv_packet_streamer> my_streamer;
+    for (size_t stream_i = 0; stream_i < args.channels.size(); stream_i++)
+    {
+
+        const size_t radio_index = _tree->access<std::vector<size_t> >("/mboards/0/rx_chan_dsp_mapping")
+                                       .get().at(args.channels[stream_i]);
+
+        radio_perifs_t &perif = _radio_perifs[radio_index];
+
+        // make a transport, grab a sid
+        boost::uint32_t data_sid;
+        both_xports_t data_xports = _make_transport(
+           radio_index ? E300_XB_DST_R1 : E300_XB_DST_R0,
+           E300_RADIO_DEST_PREFIX_RX,
+           _data_xport_params,
+           data_sid);
+
+        //calculate packet size
+        static const size_t hdr_size = 0
+            + vrt::num_vrl_words32*sizeof(boost::uint32_t)
+            + vrt::max_if_hdr_words32*sizeof(boost::uint32_t)
+            + sizeof(vrt::if_packet_info_t().tlr) //forced to have trailer
+            - sizeof(vrt::if_packet_info_t().cid) //no class id ever used
+            - sizeof(vrt::if_packet_info_t().tsi) //no int time ever used
+        ;
+        const size_t bpp = data_xports.recv->get_recv_frame_size() - hdr_size;
+        const size_t bpi = convert::get_bytes_per_item(args.otw_format);
+        const size_t spp = unsigned(args.args.cast<double>("spp", bpp/bpi));
+
+        //make the new streamer given the samples per packet
+        if (not my_streamer)
+            my_streamer = boost::make_shared<sph::recv_packet_streamer>(spp);
+        my_streamer->resize(args.channels.size());
+
+        //init some streamer stuff
+        my_streamer->set_vrt_unpacker(&e300_if_hdr_unpack_le);
+
+        //set the converter
+        uhd::convert::id_type id;
+        id.input_format = args.otw_format + "_item32_le";
+        id.num_inputs = 1;
+        id.output_format = args.cpu_format;
+        id.num_outputs = 1;
+        my_streamer->set_converter(id);
+
+        perif.framer->set_nsamps_per_packet(spp); //seems to be a good place to set this
+        perif.framer->set_sid((data_sid << 16) | (data_sid >> 16));
+        perif.framer->setup(args);
+        perif.ddc->setup(args);
+        my_streamer->set_xport_chan_get_buff(stream_i, boost::bind(
+            &zero_copy_if::get_recv_buff, data_xports.recv, _1
+        ), true /*flush*/);
+        my_streamer->set_overflow_handler(stream_i,
+            boost::bind(&rx_vita_core_3000::handle_overflow, perif.framer)
+        );
+
+        //setup flow control
+        const size_t fc_window = data_xports.recv->get_num_recv_frames();
+        perif.framer->configure_flow_control(fc_window);
+        boost::shared_ptr<e300_rx_fc_cache_t> fc_cache(new e300_rx_fc_cache_t());
+        my_streamer->set_xport_handle_flowctrl(stream_i,
+            boost::bind(&handle_rx_flowctrl, data_sid, data_xports.send, fc_cache, _1),
+            static_cast<size_t>(static_cast<double>(fc_window) * E300_RX_SW_BUFF_FULLNESS),
+            true/*init*/);
+
+        my_streamer->set_issue_stream_cmd(stream_i,
+            boost::bind(&rx_vita_core_3000::issue_stream_command, perif.framer, _1)
+        );
+        perif.rx_streamer = my_streamer; //store weak pointer
+
+        //sets all tick and samp rates on this streamer
+        this->_update_tick_rate(this->_get_tick_rate());
+        _tree->access<double>(str(boost::format("/mboards/0/rx_dsps/%u/rate/value") % radio_index)).update();
+
+    }
+    _update_enables();
+    return my_streamer;
+}
+
+/***********************************************************************
+ * Transmit streamer
+ **********************************************************************/
+tx_streamer::sptr e300_impl::get_tx_stream(const uhd::stream_args_t &args_)
+{
+    boost::mutex::scoped_lock lock(_stream_spawn_mutex);
+    stream_args_t args = args_;
+
+    //setup defaults for unspecified values
+    if (not args.otw_format.empty() and args.otw_format != "sc16")
+    {
+        throw uhd::value_error("e300_impl::get_tx_stream only supports otw_format sc16");
+    }
+    args.otw_format = "sc16";
+    args.channels = args.channels.empty()? std::vector<size_t>(1, 0) : args.channels;
+
+
+    //shared async queue for all channels in streamer
+    boost::shared_ptr<async_md_type> async_md(new async_md_type(1000/*messages deep*/));
+
+    boost::shared_ptr<sph::send_packet_streamer> my_streamer;
+
+    for (size_t stream_i = 0; stream_i < args.channels.size(); stream_i++)
+    {
+        const size_t radio_index = _tree->access<std::vector<size_t> >("/mboards/0/tx_chan_dsp_mapping")
+                                       .get().at(args.channels[stream_i]);
+
+
+        radio_perifs_t &perif = _radio_perifs[radio_index];
+
+
+        // make a transport, grab a sid
+        boost::uint32_t data_sid;
+        both_xports_t data_xports = _make_transport(
+           radio_index ? E300_XB_DST_R1 : E300_XB_DST_R0,
+           E300_RADIO_DEST_PREFIX_TX,
+           _data_xport_params,
+           data_sid);
+
+        //calculate packet size
+        static const size_t hdr_size = 0
+            + vrt::num_vrl_words32*sizeof(boost::uint32_t)
+            + vrt::max_if_hdr_words32*sizeof(boost::uint32_t)
+            + sizeof(vrt::if_packet_info_t().tlr) //forced to have trailer
+            - sizeof(vrt::if_packet_info_t().cid) //no class id ever used
+            - sizeof(vrt::if_packet_info_t().tsi) //no int time ever used
+        ;
+        const size_t bpp = data_xports.send->get_send_frame_size() - hdr_size;
+        const size_t bpi = convert::get_bytes_per_item(args.otw_format);
+        const size_t spp = unsigned(args.args.cast<double>("spp", bpp/bpi));
+
+        //make the new streamer given the samples per packet
+        if (not my_streamer)
+            my_streamer = boost::make_shared<sph::send_packet_streamer>(spp);
+        my_streamer->resize(args.channels.size());
+
+        //init some streamer stuff
+        my_streamer->set_vrt_packer(&e300_if_hdr_pack_le);
+
+        //set the converter
+        uhd::convert::id_type id;
+        id.input_format = args.cpu_format;
+        id.num_inputs = 1;
+        id.output_format = args.otw_format + "_item32_le";
+        id.num_outputs = 1;
+        my_streamer->set_converter(id);
+
+        perif.deframer->clear();
+        perif.deframer->setup(args);
+        perif.duc->setup(args);
+
+        //flow control setup
+        const size_t fc_window = data_xports.send->get_num_send_frames();
+        perif.deframer->configure_flow_control(0/*cycs off*/, fc_window/8/*pkts*/);
+        boost::shared_ptr<e300_tx_fc_cache_t> fc_cache(new e300_tx_fc_cache_t());
+        fc_cache->stream_channel = stream_i;
+        fc_cache->device_channel = args.channels[stream_i];
+        fc_cache->async_queue = async_md;
+        fc_cache->old_async_queue = _async_md;
+
+        tick_rate_retriever_t get_tick_rate_fn = boost::bind(&e300_impl::_get_tick_rate, this);
+
+        task::sptr task = task::make(boost::bind(&handle_tx_async_msgs,
+                                                 fc_cache, data_xports.recv,
+                                                 get_tick_rate_fn));
+
+        my_streamer->set_xport_chan_get_buff(
+            stream_i,
+            boost::bind(&get_tx_buff_with_flowctrl, task, fc_cache, data_xports.send, fc_window, _1)
+        );
+
+        my_streamer->set_async_receiver(
+            boost::bind(&async_md_type::pop_with_timed_wait, async_md, _1, _2)
+        );
+        my_streamer->set_xport_chan_sid(stream_i, true, data_sid);
+        my_streamer->set_enable_trailer(false); //TODO not implemented trailer support yet
+        perif.tx_streamer = my_streamer; //store weak pointer
+
+        //sets all tick and samp rates on this streamer
+        this->_update_tick_rate(this->_get_tick_rate());
+        _tree->access<double>(str(boost::format("/mboards/0/tx_dsps/%u/rate/value") % radio_index)).update();
+    }
+    _update_enables();
+    return my_streamer;
+}
+}}} // namespace
diff --git a/host/lib/usrp/e300/e300_network.cpp b/host/lib/usrp/e300/e300_network.cpp
new file mode 100644
index 000000000..883ff0c4f
--- /dev/null
+++ b/host/lib/usrp/e300/e300_network.cpp
@@ -0,0 +1,642 @@
+//
+// Copyright 2013-2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "e300_network.hpp"
+
+#ifdef E300_NATIVE
+
+#include "e300_impl.hpp"
+
+#include "ad9361_ctrl.hpp"
+
+#include "e300_sensor_manager.hpp"
+#include "e300_fifo_config.hpp"
+#include "e300_spi.hpp"
+#include "e300_i2c.hpp"
+#include "e300_defaults.hpp"
+#include "e300_common.hpp"
+#include "e300_remote_codec_ctrl.hpp"
+
+#include <uhd/utils/msg.hpp>
+#include <uhd/utils/byteswap.hpp>
+#include <uhd/utils/images.hpp>
+
+#include <boost/asio.hpp>
+#include <boost/thread.hpp>
+#include <boost/filesystem.hpp>
+#include <boost/make_shared.hpp>
+
+#include <fstream>
+
+using namespace uhd;
+using namespace uhd::transport;
+namespace asio = boost::asio;
+namespace fs = boost::filesystem;
+
+namespace uhd { namespace usrp { namespace e300 {
+
+static const size_t E300_NETWORK_DEBUG = false;
+
+static inline bool wait_for_recv_ready(int sock_fd, const size_t timeout_ms)
+{
+    //setup timeval for timeout
+    timeval tv;
+    tv.tv_sec = 0;
+    tv.tv_usec = timeout_ms*1000;
+
+    //setup rset for timeout
+    fd_set rset;
+    FD_ZERO(&rset);
+    FD_SET(sock_fd, &rset);
+
+    //call select with timeout on receive socket
+    return ::select(sock_fd+1, &rset, NULL, NULL, &tv) > 0;
+}
+
+static boost::mutex endpoint_mutex;
+
+/***********************************************************************
+ * Receive tunnel - forwards recv interface to send socket
+ **********************************************************************/
+static void e300_recv_tunnel(
+    const std::string &name,
+    uhd::transport::zero_copy_if::sptr recver,
+    boost::shared_ptr<asio::ip::udp::socket> sender,
+    asio::ip::udp::endpoint *endpoint,
+    bool *running
+)
+{
+    asio::ip::udp::endpoint _tx_endpoint;
+    try
+    {
+        while (*running)
+        {
+            //step 1 - get the buffer
+            managed_recv_buffer::sptr buff = recver->get_recv_buff();
+            if (not buff) continue;
+            if (E300_NETWORK_DEBUG) UHD_MSG(status) << name << " got " << buff->size() << std::endl;
+
+            //step 1.5 -- update endpoint
+            {
+                boost::mutex::scoped_lock l(endpoint_mutex);
+                _tx_endpoint = *endpoint;
+            }
+
+            //step 2 - send to the socket
+            sender->send_to(asio::buffer(buff->cast<const void *>(), buff->size()), _tx_endpoint);
+        }
+    }
+    catch(const std::exception &ex)
+    {
+        UHD_MSG(error) << "e300_recv_tunnel exit " << name << " " << ex.what() << std::endl;
+    }
+    catch(...)
+    {
+        UHD_MSG(error) << "e300_recv_tunnel exit " << name << std::endl;
+    }
+    UHD_MSG(status) << "e300_recv_tunnel exit " << name << std::endl;
+    *running = false;
+}
+
+/***********************************************************************
+ * Send tunnel - forwards recv socket to send interface
+ **********************************************************************/
+static void e300_send_tunnel(
+    const std::string &name,
+    boost::shared_ptr<asio::ip::udp::socket> recver,
+    uhd::transport::zero_copy_if::sptr sender,
+    asio::ip::udp::endpoint *endpoint,
+    bool *running
+)
+{
+    asio::ip::udp::endpoint _rx_endpoint;
+    try
+    {
+        while (*running)
+        {
+            //step 1 - get the buffer
+            managed_send_buffer::sptr buff = sender->get_send_buff();
+            if (not buff) continue;
+
+            //step 2 - recv from socket
+            while (not wait_for_recv_ready(recver->native(), 100) and *running){}
+            if (not *running) break;
+            const size_t num_bytes = recver->receive_from(asio::buffer(buff->cast<void *>(), buff->size()), _rx_endpoint);
+            if (E300_NETWORK_DEBUG) UHD_MSG(status) << name << " got " << num_bytes << std::endl;
+
+            //step 2.5 -- update endpoint
+            {
+                boost::mutex::scoped_lock l(endpoint_mutex);
+                *endpoint = _rx_endpoint;
+            }
+
+            //step 3 - commit the buffer
+            buff->commit(num_bytes);
+        }
+    }
+    catch(const std::exception &ex)
+    {
+        UHD_MSG(error) << "e300_send_tunnel exit " << name << " " << ex.what() << std::endl;
+    }
+    catch(...)
+    {
+        UHD_MSG(error) << "e300_send_tunnel exit " << name << std::endl;
+    }
+    UHD_MSG(status) << "e300_send_tunnel exit " << name << std::endl;
+    *running = false;
+}
+
+static void e300_codec_ctrl_tunnel(
+    const std::string &name,
+    boost::shared_ptr<asio::ip::udp::socket> socket,
+    ad9361_ctrl::sptr _codec_ctrl,
+    asio::ip::udp::endpoint *endpoint,
+    bool *running
+)
+{
+    asio::ip::udp::endpoint _endpoint;
+    try
+    {
+        while (*running)
+        {
+            uint8_t in_buff[64] = {};
+            uint8_t out_buff[64] = {};
+
+            const size_t num_bytes = socket->receive_from(asio::buffer(in_buff), *endpoint);
+
+            typedef e300_remote_codec_ctrl::transaction_t codec_xact_t;
+
+            if (num_bytes < sizeof(codec_xact_t)) {
+                std::cout << "Received short packet of " << num_bytes  << std::endl;
+                continue;
+            }
+
+            codec_xact_t *in = reinterpret_cast<codec_xact_t*>(in_buff);
+            codec_xact_t *out = reinterpret_cast<codec_xact_t*>(out_buff);
+            std::memcpy(out, in, sizeof(codec_xact_t));
+
+            std::string which_str;
+            switch (uhd::ntohx<boost::uint32_t>(in->which)) {
+            case codec_xact_t::CHAIN_TX1:
+                which_str = "TX1"; break;
+            case codec_xact_t::CHAIN_TX2:
+                which_str = "TX2"; break;
+            case codec_xact_t::CHAIN_RX1:
+                which_str = "RX1"; break;
+            case codec_xact_t::CHAIN_RX2:
+                which_str = "RX2"; break;
+            default:
+                which_str = ""; break;
+            }
+
+            switch (uhd::ntohx<boost::uint32_t>(in->action)) {
+            case codec_xact_t::ACTION_SET_GAIN:
+                out->gain = _codec_ctrl->set_gain(which_str, in->gain);
+                break;
+            case codec_xact_t::ACTION_SET_CLOCK_RATE:
+                out->rate = _codec_ctrl->set_clock_rate(in->rate);
+                break;
+            case codec_xact_t::ACTION_SET_ACTIVE_CHANS:
+                _codec_ctrl->set_active_chains(
+                    uhd::ntohx<boost::uint32_t>(in->bits) & (1<<0),
+                    uhd::ntohx<boost::uint32_t>(in->bits) & (1<<1),
+                    uhd::ntohx<boost::uint32_t>(in->bits) & (1<<2),
+                    uhd::ntohx<boost::uint32_t>(in->bits) & (1<<3));
+                break;
+            case codec_xact_t::ACTION_TUNE:
+                out->freq = _codec_ctrl->tune(which_str, in->freq);
+                break;
+            case codec_xact_t::ACTION_SET_LOOPBACK:
+                _codec_ctrl->data_port_loopback(
+                    uhd::ntohx<boost::uint32_t>(in->bits) & 1);
+                break;
+            default:
+                UHD_MSG(status) << "Got unknown request?!" << std::endl;
+                //Zero out actions to fail this request on client
+                out->action = uhd::htonx<boost::uint32_t>(0);
+            }
+
+            socket->send_to(asio::buffer(out_buff, 64), *endpoint);
+        }
+    }
+    catch(const std::exception &ex)
+    {
+        UHD_MSG(error) << "e300_ctrl_tunnel exit " << name << " " << ex.what() << std::endl;
+    }
+    catch(...)
+    {
+        UHD_MSG(error) << "e300_ctrl_tunnel exit " << name << std::endl;
+    }
+    UHD_MSG(status) << "e300_ctrl_tunnel exit " << name << std::endl;
+    *running = false;
+}
+
+static void e300_global_regs_tunnel(
+    const std::string &name,
+    boost::shared_ptr<asio::ip::udp::socket> socket,
+    global_regs::sptr regs,
+    asio::ip::udp::endpoint *endpoint,
+    bool *running
+)
+{
+    UHD_ASSERT_THROW(regs);
+    asio::ip::udp::endpoint _endpoint;
+    try
+    {
+        while (*running)
+        {
+            uint8_t in_buff[16] = {};
+
+            const size_t num_bytes = socket->receive_from(asio::buffer(in_buff), *endpoint);
+
+            if (num_bytes < 16) {
+                std::cout << "Received short packet: " << num_bytes << std::endl;
+                continue;
+            }
+
+            global_regs_transaction_t *in =
+                reinterpret_cast<global_regs_transaction_t *>(in_buff);
+
+            if(uhd::ntohx<boost::uint32_t>(in->is_poke)) {
+                regs->poke32(uhd::ntohx<boost::uint32_t>(in->addr), uhd::ntohx<boost::uint32_t>(in->data));
+            }
+            else {
+                in->data = uhd::htonx<boost::uint32_t>(regs->peek32(uhd::ntohx<boost::uint32_t>(in->addr)));
+                socket->send_to(asio::buffer(in_buff, 16), *endpoint);
+            }
+        }
+    }
+    catch(const std::exception &ex)
+    {
+        UHD_MSG(error) << "e300_gregs_tunnel exit " << name << " " << ex.what() << std::endl;
+    }
+    catch(...)
+    {
+        UHD_MSG(error) << "e300_gregs_tunnel exit " << name << std::endl;
+    }
+    UHD_MSG(status) << "e300_gregs_tunnel exit " << name << std::endl;
+    *running = false;
+}
+
+static void e300_sensor_tunnel(
+    const std::string &name,
+    boost::shared_ptr<asio::ip::udp::socket> socket,
+    e300_sensor_manager::sptr sensor_manager,
+    asio::ip::udp::endpoint *endpoint,
+    bool *running
+)
+{
+    asio::ip::udp::endpoint _endpoint;
+    try
+    {
+        while (*running)
+        {
+            uint8_t in_buff[128] = {};
+
+            const size_t num_bytes = socket->receive_from(asio::buffer(in_buff), *endpoint);
+
+            if (num_bytes < sizeof(sensor_transaction_t)) {
+                std::cout << "Received short packet: " << num_bytes << std::endl;
+                continue;
+            }
+
+            uhd::usrp::e300::sensor_transaction_t *in =
+                reinterpret_cast<uhd::usrp::e300::sensor_transaction_t *>(in_buff);
+
+            if (uhd::ntohx(in->which) == ZYNQ_TEMP) {
+                sensor_value_t temp = sensor_manager->get_mb_temp();
+                // TODO: This is ugly ... use proper serialization
+                in->value = uhd::htonx<boost::uint32_t>(
+                    e300_sensor_manager::pack_float_in_uint32_t(temp.to_real()));
+            } else if (uhd::ntohx(in->which) == GPS_FOUND) {
+                in->value = uhd::htonx<boost::uint32_t>(
+                    sensor_manager->get_gps_found() ? 1 : 0);
+
+            } else if (uhd::ntohx(in->which) == GPS_LOCK) {
+                in->value = uhd::htonx<boost::uint32_t>(
+                    sensor_manager->get_gps_lock().to_bool() ? 1 : 0);
+            } else if (uhd::ntohx(in->which) == GPS_TIME) {
+                in->value = uhd::htonx<boost::uint32_t>(
+                    sensor_manager->get_gps_time().to_int());
+            } else
+                UHD_MSG(status) << "Got unknown request?!" << std::endl;
+
+            socket->send_to(asio::buffer(in_buff, sizeof(sensor_transaction_t)), *endpoint);
+        }
+    }
+    catch(const std::exception &ex)
+    {
+        UHD_MSG(error) << "e300_sensor_tunnel exit " << name << " " << ex.what() << std::endl;
+    }
+    catch(...)
+    {
+        UHD_MSG(error) << "e300_sensor_tunnel exit " << name << std::endl;
+    }
+    UHD_MSG(status) << "e300_sensor_tunnel exit " << name << std::endl;
+    *running = false;
+}
+
+static void e300_i2c_tunnel(
+    const std::string &name,
+    boost::shared_ptr<asio::ip::udp::socket> socket,
+    uhd::usrp::e300::i2c::sptr i2c,
+    asio::ip::udp::endpoint *endpoint,
+    bool *running
+)
+{
+    UHD_ASSERT_THROW(i2c);
+    asio::ip::udp::endpoint _endpoint;
+    try
+    {
+        while (*running)
+        {
+            uint8_t in_buff[sizeof(uhd::usrp::e300::i2c_transaction_t)];
+
+            const size_t num_bytes = socket->receive_from(asio::buffer(in_buff), *endpoint);
+
+            if (num_bytes < sizeof(uhd::usrp::e300::i2c_transaction_t)) {
+                std::cout << "Received short packet: " << num_bytes << std::endl;
+                continue;
+            }
+
+            uhd::usrp::e300::i2c_transaction_t *in =
+                reinterpret_cast<uhd::usrp::e300::i2c_transaction_t *>(in_buff);
+
+            // byte addressed accesses go through here
+            if(in->type & i2c::ONEBYTE) {
+                if(in->type & i2c::WRITE) {
+                    i2c->set_i2c_reg8(
+                        in->addr,
+                        uhd::ntohx<boost::uint16_t>(in->reg), in->data);
+                } else {
+                    in->data = i2c->get_i2c_reg8(in->addr, uhd::ntohx<boost::uint16_t>(in->reg));
+                    socket->send_to(asio::buffer(in_buff, sizeof(in_buff)), *endpoint);
+                }
+
+            // 2 byte addressed accesses go through here
+            } else if (in->type & i2c::TWOBYTE) {
+                if(in->type & i2c::WRITE) {
+                    i2c->set_i2c_reg16(
+                        in->addr,
+                        uhd::ntohx<boost::uint16_t>(in->reg), in->data);
+                } else {
+                    in->data = i2c->get_i2c_reg16(in->addr, uhd::ntohx<boost::uint16_t>(in->reg));
+                    socket->send_to(asio::buffer(in_buff, sizeof(in_buff)), *endpoint);
+                }
+
+            } else {
+                UHD_MSG(error) << "e300_i2c_tunnel could not handle message." << std::endl;
+            }
+        }
+    }
+    catch(const std::exception &ex)
+    {
+        UHD_MSG(error) << "e300_i2c_tunnel exit " << name << " " << ex.what() << std::endl;
+    }
+    catch(...)
+    {
+        UHD_MSG(error) << "e300_i2c_tunnel exit " << name << std::endl;
+    }
+    UHD_MSG(status) << "e300_i2c_tunnel exit " << name << std::endl;
+    *running = false;
+}
+
+
+
+
+class network_server_impl : public network_server
+{
+public:
+    network_server_impl(const uhd::device_addr_t &device_addr);
+    virtual ~network_server_impl(void);
+    void run(void);
+
+private:
+    struct xports_t
+    {
+        uhd::transport::zero_copy_if::sptr send_ctrl_xport;
+        uhd::transport::zero_copy_if::sptr recv_ctrl_xport;
+        uhd::transport::zero_copy_if::sptr tx_data_xport;
+        uhd::transport::zero_copy_if::sptr tx_flow_xport;
+        uhd::transport::zero_copy_if::sptr rx_data_xport;
+        uhd::transport::zero_copy_if::sptr rx_flow_xport;
+    };
+
+private:
+    void _run_server(
+        const std::string &port,
+        const std::string &what,
+        const size_t fe);
+
+private:
+    boost::shared_ptr<e300_fifo_interface>   _fifo_iface;
+    xports_t                                 _xports[2];
+    boost::shared_ptr<ad9361_ctrl>           _codec_ctrl;
+    boost::shared_ptr<global_regs>           _global_regs;
+    boost::shared_ptr<e300_sensor_manager>   _sensor_manager;
+    boost::shared_ptr<e300_eeprom_manager>   _eeprom_manager;
+};
+
+network_server_impl::~network_server_impl(void)
+{
+}
+
+/***********************************************************************
+ * The UDP server itself
+ **********************************************************************/
+void network_server_impl::_run_server(
+    const std::string &port,
+    const std::string &what,
+    const size_t fe)
+{
+    asio::io_service io_service;
+    asio::ip::udp::resolver resolver(io_service);
+    asio::ip::udp::resolver::query query(asio::ip::udp::v4(), "0.0.0.0", port);
+    asio::ip::udp::endpoint endpoint = *resolver.resolve(query);
+
+    //boost::shared_ptr<asio::ip::udp::acceptor> acceptor(new asio::ip::udp::acceptor(io_service, endpoint));
+    while (not boost::this_thread::interruption_requested())
+    {
+        UHD_MSG(status) << "e300 run server on port " << port << " for " << what << std::endl;
+        try
+        {
+            //while (not wait_for_recv_ready(acceptor->native(), 100))
+            //{
+            //    if (boost::this_thread::interruption_requested()) return;
+            //}
+            boost::shared_ptr<asio::ip::udp::socket> socket;
+            socket.reset(new asio::ip::udp::socket(io_service, endpoint));
+            //acceptor->accept(*socket);
+            UHD_MSG(status) << "e300 socket accept on port " << port << " for " << what << std::endl;
+            //asio::ip::udp::no_delay option(true);
+            //socket->set_option(option);
+            boost::thread_group tg;
+            bool running = true;
+            xports_t &perif = _xports[fe];
+            if (what == "RX") {
+                tg.create_thread(boost::bind(&e300_recv_tunnel, "RX data tunnel", perif.rx_data_xport, socket, &endpoint, &running));
+                tg.create_thread(boost::bind(&e300_send_tunnel, "RX flow tunnel", socket, perif.rx_flow_xport, &endpoint, &running));
+            }
+            if (what == "TX") {
+                tg.create_thread(boost::bind(&e300_recv_tunnel, "TX flow tunnel", perif.tx_flow_xport, socket, &endpoint, &running));
+                tg.create_thread(boost::bind(&e300_send_tunnel, "TX data tunnel", socket, perif.tx_data_xport, &endpoint, &running));
+            }
+            if (what == "CTRL") {
+                tg.create_thread(boost::bind(&e300_recv_tunnel, "response tunnel", perif.recv_ctrl_xport, socket, &endpoint, &running));
+                tg.create_thread(boost::bind(&e300_send_tunnel, "control tunnel", socket, perif.send_ctrl_xport, &endpoint, &running));
+            }
+            if (what == "CODEC") {
+                tg.create_thread(boost::bind(&e300_codec_ctrl_tunnel, "CODEC tunnel", socket, _codec_ctrl, &endpoint, &running));
+            }
+            if (what == "I2C") {
+                tg.create_thread(boost::bind(&e300_i2c_tunnel, "I2C tunnel", socket, _eeprom_manager->get_i2c_sptr(), &endpoint, &running));
+            }
+            if (what == "GREGS") {
+                tg.create_thread(boost::bind(&e300_global_regs_tunnel, "GREGS tunnel", socket, _global_regs, &endpoint, &running));
+            }
+            if (what == "SENSOR") {
+                tg.create_thread(boost::bind(&e300_sensor_tunnel, "SENSOR tunnel", socket, _sensor_manager, &endpoint, &running));
+            }
+
+            tg.join_all();
+            socket->close();
+            socket.reset();
+        }
+        catch(...){}
+    }
+}
+
+void network_server_impl::run()
+{
+    for(;;)
+    {
+        boost::thread_group tg;
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_RX_PORT0, "RX",0));
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_TX_PORT0, "TX",0));
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_CTRL_PORT0, "CTRL",0));
+
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_RX_PORT1, "RX",1));
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_TX_PORT1, "TX",1));
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_CTRL_PORT1, "CTRL",1));
+
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_SENSOR_PORT, "SENSOR", 0 /*don't care */));
+
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_CODEC_PORT, "CODEC", 0 /*don't care */));
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_GREGS_PORT, "GREGS", 0 /*don't care */));
+        tg.create_thread(boost::bind(&network_server_impl::_run_server, this, E300_SERVER_I2C_PORT, "I2C", 0 /*don't care */));
+        tg.join_all();
+    }
+}
+network_server_impl::network_server_impl(const uhd::device_addr_t &device_addr)
+{
+    _eeprom_manager = boost::make_shared<e300_eeprom_manager>(i2c::make_i2cdev(E300_I2CDEV_DEVICE));
+    if (not device_addr.has_key("no_reload_fpga")) {
+        // Load FPGA image if provided via args
+        if (device_addr.has_key("fpga")) {
+            common::load_fpga_image(device_addr["fpga"]);
+        // Else load the FPGA image based on the product ID
+        } else {
+            //extract the FPGA path for the e300
+            const boost::uint16_t pid = boost::lexical_cast<boost::uint16_t>(
+                _eeprom_manager->get_mb_eeprom()["product"]);
+            std::string fpga_image;
+            switch(e300_eeprom_manager::get_mb_type(pid)) {
+            case e300_eeprom_manager::USRP_E310_MB:
+                fpga_image = find_image_path(E310_FPGA_FILE_NAME);
+                break;
+            case e300_eeprom_manager::USRP_E300_MB:
+                fpga_image = find_image_path(E300_FPGA_FILE_NAME);
+                break;
+            case e300_eeprom_manager::UNKNOWN:
+            default:
+                UHD_MSG(warning) << "Unknown motherboard type, loading e300 image."
+                                 << std::endl;
+                fpga_image = find_image_path(E300_FPGA_FILE_NAME);
+                break;
+            }
+            common::load_fpga_image(fpga_image);
+        }
+    }
+
+    uhd::transport::zero_copy_xport_params ctrl_xport_params;
+    ctrl_xport_params.recv_frame_size = e300::DEFAULT_CTRL_FRAME_SIZE;
+    ctrl_xport_params.num_recv_frames = e300::DEFAULT_CTRL_NUM_FRAMES;
+    ctrl_xport_params.send_frame_size = e300::DEFAULT_CTRL_FRAME_SIZE;
+    ctrl_xport_params.num_send_frames = e300::DEFAULT_CTRL_NUM_FRAMES;
+
+    uhd::transport::zero_copy_xport_params data_xport_params;
+    data_xport_params.recv_frame_size = device_addr.cast<size_t>("recv_frame_size", e300::DEFAULT_RX_DATA_FRAME_SIZE);
+    data_xport_params.num_recv_frames = device_addr.cast<size_t>("num_recv_frames", e300::DEFAULT_RX_DATA_NUM_FRAMES);
+    data_xport_params.send_frame_size = device_addr.cast<size_t>("send_frame_size", e300::DEFAULT_TX_DATA_FRAME_SIZE);
+    data_xport_params.num_send_frames = device_addr.cast<size_t>("num_send_frames", e300::DEFAULT_TX_DATA_NUM_FRAMES);
+    // until we figure out why this goes wrong we'll keep this hack around
+    data_xport_params.recv_frame_size =
+        std::min(e300::MAX_NET_RX_DATA_FRAME_SIZE, data_xport_params.recv_frame_size);
+    data_xport_params.send_frame_size =
+        std::min(e300::MAX_NET_TX_DATA_FRAME_SIZE, data_xport_params.send_frame_size);
+
+
+    e300_fifo_config_t fifo_cfg;
+    try {
+        fifo_cfg = e300_read_sysfs();
+    } catch (uhd::lookup_error &e) {
+        throw uhd::runtime_error("Failed to get driver parameters from sysfs.");
+    }
+    _fifo_iface = e300_fifo_interface::make(fifo_cfg);
+    _global_regs = global_regs::make(_fifo_iface->get_global_regs_base());
+
+    // static mapping, boooohhhhhh
+    _xports[0].send_ctrl_xport = _fifo_iface->make_send_xport(E300_R0_CTRL_STREAM, ctrl_xport_params);
+    _xports[0].recv_ctrl_xport = _fifo_iface->make_recv_xport(E300_R0_CTRL_STREAM, ctrl_xport_params);
+    _xports[0].tx_data_xport   = _fifo_iface->make_send_xport(E300_R0_TX_DATA_STREAM, data_xport_params);
+    _xports[0].tx_flow_xport   = _fifo_iface->make_recv_xport(E300_R0_TX_DATA_STREAM, ctrl_xport_params);
+    _xports[0].rx_data_xport   = _fifo_iface->make_recv_xport(E300_R0_RX_DATA_STREAM, data_xport_params);
+    _xports[0].rx_flow_xport   = _fifo_iface->make_send_xport(E300_R0_RX_DATA_STREAM, ctrl_xport_params);
+
+    _xports[1].send_ctrl_xport = _fifo_iface->make_send_xport(E300_R1_CTRL_STREAM, ctrl_xport_params);
+    _xports[1].recv_ctrl_xport = _fifo_iface->make_recv_xport(E300_R1_CTRL_STREAM, ctrl_xport_params);
+    _xports[1].tx_data_xport   = _fifo_iface->make_send_xport(E300_R1_TX_DATA_STREAM, data_xport_params);
+    _xports[1].tx_flow_xport   = _fifo_iface->make_recv_xport(E300_R1_TX_DATA_STREAM, ctrl_xport_params);
+    _xports[1].rx_data_xport   = _fifo_iface->make_recv_xport(E300_R1_RX_DATA_STREAM, data_xport_params);
+    _xports[1].rx_flow_xport   = _fifo_iface->make_send_xport(E300_R1_RX_DATA_STREAM, ctrl_xport_params);
+
+    ad9361_params::sptr client_settings = boost::make_shared<e300_ad9361_client_t>();
+    _codec_ctrl = ad9361_ctrl::make_spi(client_settings, spi::make(E300_SPIDEV_DEVICE), 1);
+    // This is horrible ... why do I have to sleep here?
+    boost::this_thread::sleep(boost::posix_time::milliseconds(100));
+    _sensor_manager = e300_sensor_manager::make_local(
+        gps::ublox::ubx::control::make("/dev/ttyPS1", 9600));
+}
+
+}}} // namespace
+
+using namespace uhd::usrp::e300;
+
+network_server::sptr network_server::make(const uhd::device_addr_t &device_addr)
+{
+    return sptr(new network_server_impl(device_addr));
+}
+
+#else
+
+using namespace uhd::usrp::e300;
+
+network_server::sptr network_server::make(const uhd::device_addr_t &)
+{
+    throw uhd::assertion_error("network_server::make() !E300_NATIVE");
+}
+#endif
diff --git a/host/lib/usrp/e300/e300_network.hpp b/host/lib/usrp/e300/e300_network.hpp
new file mode 100644
index 000000000..5a9df0ca7
--- /dev/null
+++ b/host/lib/usrp/e300/e300_network.hpp
@@ -0,0 +1,43 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_NETWORK_HPP
+#define INCLUDED_E300_NETWORK_HPP
+
+#include <string>
+#include <boost/noncopyable.hpp>
+
+#include <uhd/device.hpp>
+
+
+static const std::string E310_FPGA_FILE_NAME = "usrp_e310_fpga.bit";
+static const std::string E300_FPGA_FILE_NAME = "usrp_e300_fpga.bit";
+
+namespace uhd { namespace usrp { namespace e300 {
+
+class UHD_API network_server : boost::noncopyable
+{
+public:
+    typedef boost::shared_ptr<network_server> sptr;
+    virtual void run(void) = 0;
+
+    static sptr make(const uhd::device_addr_t &device_addr);
+};
+
+
+}}}
+#endif // INCLUDED_E300_NETWORK_HPP
diff --git a/host/lib/usrp/e300/e300_regs.hpp b/host/lib/usrp/e300/e300_regs.hpp
new file mode 100644
index 000000000..f99a19b8e
--- /dev/null
+++ b/host/lib/usrp/e300/e300_regs.hpp
@@ -0,0 +1,69 @@
+//
+// Copyright 2012-2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_REGS_HPP
+#define INCLUDED_E300_REGS_HPP
+
+#include <boost/cstdint.hpp>
+
+#define TOREG(x) ((x)*4)
+
+#define localparam static const int
+
+localparam SR_TEST       = 7;
+localparam SR_SPI        = 8;
+localparam SR_GPIO       = 16;
+localparam SR_MISC_OUTS  = 24;
+localparam SR_READBACK   = 32;
+localparam SR_TX_CTRL    = 64;
+localparam SR_RX_CTRL    = 96;
+localparam SR_TIME       = 128;
+localparam SR_RX_DSP     = 144;
+localparam SR_TX_DSP     = 184;
+localparam SR_LEDS       = 196;
+localparam SR_FP_GPIO    = 200;
+localparam SR_RX_FRONT   = 208;
+localparam SR_TX_FRONT   = 216;
+localparam SR_CODEC_IDLE = 250;
+
+
+localparam RB32_SPI             = 4;
+localparam RB64_TIME_NOW        = 8;
+localparam RB64_TIME_PPS        = 16;
+localparam RB32_TEST            = 24;
+localparam RB32_FP_GPIO         = 32;
+localparam RB64_CODEC_READBACK  = 40;
+localparam RB32_RADIO_NUM       = 48;
+
+localparam ST_RX_ENABLE = 20;
+localparam ST_TX_ENABLE = 19;
+
+localparam LED_TXRX_TX = 18;
+localparam LED_TXRX_RX = 17;
+localparam LED_RX_RX = 16;
+localparam VCRX_V2 = 15;
+localparam VCRX_V1 = 14;
+localparam VCTXRX_V2 = 13;
+localparam VCTXRX_V1 = 12;
+localparam TX_ENABLEB = 11;
+localparam TX_ENABLEA = 10;
+localparam RXC_BANDSEL = 8;
+localparam RXB_BANDSEL = 6;
+localparam RX_BANDSEL = 3;
+localparam TX_BANDSEL = 0;
+
+#endif /* INCLUDED_E300_REGS_HPP */
diff --git a/host/lib/usrp/e300/e300_remote_codec_ctrl.cpp b/host/lib/usrp/e300/e300_remote_codec_ctrl.cpp
new file mode 100644
index 000000000..bcc8ee4cf
--- /dev/null
+++ b/host/lib/usrp/e300/e300_remote_codec_ctrl.cpp
@@ -0,0 +1,148 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "e300_remote_codec_ctrl.hpp"
+
+#include <boost/cstdint.hpp>
+#include <uhd/exception.hpp>
+#include <uhd/utils/byteswap.hpp>
+#include <cstring>
+#include <iostream>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+class e300_remote_codec_ctrl_impl : public e300_remote_codec_ctrl
+{
+public:
+    e300_remote_codec_ctrl_impl(uhd::transport::zero_copy_if::sptr xport) : _xport(xport)
+    {
+    }
+
+    virtual ~e300_remote_codec_ctrl_impl(void)
+    {
+    }
+
+    double set_gain(const std::string &which, const double value)
+    {
+        _clear();
+        _args.action = uhd::htonx<boost::uint32_t>(transaction_t::ACTION_SET_GAIN);
+        if (which == "TX1")      _args.which = uhd::htonx<boost::uint32_t>(transaction_t::CHAIN_TX1);
+        else if (which == "TX2") _args.which = uhd::htonx<boost::uint32_t>(transaction_t::CHAIN_TX2);
+        else if (which == "RX1") _args.which = uhd::htonx<boost::uint32_t>(transaction_t::CHAIN_RX1);
+        else if (which == "RX2") _args.which = uhd::htonx<boost::uint32_t>(transaction_t::CHAIN_RX2);
+        else throw std::runtime_error("e300_remote_codec_ctrl_impl incorrect chain string.");
+        _args.gain = value;
+
+        _transact();
+        return _retval.gain;
+    }
+
+    double set_clock_rate(const double rate)
+    {
+        _clear();
+        _args.action = uhd::htonx<boost::uint32_t>(
+            transaction_t::ACTION_SET_CLOCK_RATE);
+        _args.which = uhd::htonx<boost::uint32_t>(
+            transaction_t::CHAIN_NONE);  /*Unused*/
+        _args.rate = rate;
+
+        _transact();
+        return _retval.gain;
+    }
+
+    void set_active_chains(bool tx1, bool tx2, bool rx1, bool rx2)
+    {
+        _clear();
+        _args.action = uhd::htonx<boost::uint32_t>(
+            transaction_t::ACTION_SET_ACTIVE_CHANS);
+        /*Unused*/
+        _args.which = uhd::htonx<boost::uint32_t>(
+            transaction_t::CHAIN_NONE);
+        _args.bits = uhd::htonx<boost::uint32_t>(
+                     (tx1 ? (1<<0) : 0) |
+                     (tx2 ? (1<<1) : 0) |
+                     (rx1 ? (1<<2) : 0) |
+                     (rx2 ? (1<<3) : 0));
+
+        _transact();
+    }
+
+    double tune(const std::string &which, const double value)
+    {
+        _clear();
+        _args.action = uhd::htonx<boost::uint32_t>(transaction_t::ACTION_TUNE);
+        if (which == "TX1")      _args.which = uhd::htonx<boost::uint32_t>(transaction_t::CHAIN_TX1);
+        else if (which == "TX2") _args.which = uhd::htonx<boost::uint32_t>(transaction_t::CHAIN_TX2);
+        else if (which == "RX1") _args.which = uhd::htonx<boost::uint32_t>(transaction_t::CHAIN_RX1);
+        else if (which == "RX2") _args.which = uhd::htonx<boost::uint32_t>(transaction_t::CHAIN_RX2);
+        else throw std::runtime_error("e300_remote_codec_ctrl_impl incorrect chain string.");
+        _args.freq = value;
+
+        _transact();
+        return _retval.freq;
+    }
+
+    void data_port_loopback(const bool on)
+    {
+        _clear();
+        _args.action = uhd::htonx<boost::uint32_t>(transaction_t::ACTION_SET_LOOPBACK);
+        _args.which  = uhd::htonx<boost::uint32_t>(transaction_t::CHAIN_NONE);  /*Unused*/
+        _args.bits = uhd::htonx<boost::uint32_t>(on ? 1 : 0);
+
+        _transact();
+    }
+
+private:
+    void _transact() {
+        {
+            uhd::transport::managed_send_buffer::sptr buff = _xport->get_send_buff(10.0);
+            if (not buff or buff->size() < sizeof(_args))
+                throw std::runtime_error("e300_remote_codec_ctrl_impl send timeout");
+            std::memcpy(buff->cast<void *>(), &_args, sizeof(_args));
+            buff->commit(sizeof(_args));
+        }
+        {
+            uhd::transport::managed_recv_buffer::sptr buff = _xport->get_recv_buff(10.0);
+            if (not buff or buff->size() < sizeof(_retval))
+                throw std::runtime_error("e300_remote_codec_ctrl_impl recv timeout");
+            std::memcpy(&_retval, buff->cast<const void *>(), sizeof(_retval));
+        }
+
+        if (_args.action != _retval.action)
+            throw std::runtime_error("e300_remote_codec_ctrl_impl trancation failed.");
+    }
+
+    void _clear() {
+        _args.action = 0;
+        _args.which = 0;
+        _args.bits = 0;
+        _retval.action = 0;
+        _retval.which = 0;
+        _retval.bits = 0;
+    }
+
+    uhd::transport::zero_copy_if::sptr _xport;
+    transaction_t                      _args;
+    transaction_t                      _retval;
+};
+
+ad9361_ctrl::sptr e300_remote_codec_ctrl::make(uhd::transport::zero_copy_if::sptr xport)
+{
+    return sptr(new e300_remote_codec_ctrl_impl(xport));
+}
+
+}}};
diff --git a/host/lib/usrp/e300/e300_remote_codec_ctrl.hpp b/host/lib/usrp/e300/e300_remote_codec_ctrl.hpp
new file mode 100644
index 000000000..015ad8323
--- /dev/null
+++ b/host/lib/usrp/e300/e300_remote_codec_ctrl.hpp
@@ -0,0 +1,59 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_REMOTE_CODEC_CTRL_HPP
+#define INCLUDED_E300_REMOTE_CODEC_CTRL_HPP
+
+#include "ad9361_ctrl.hpp"
+#include <uhd/transport/zero_copy.hpp>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+class e300_remote_codec_ctrl : public uhd::usrp::ad9361_ctrl
+{
+public:
+    struct transaction_t {
+        boost::uint32_t     action;
+        boost::uint32_t     which;
+        union {
+            double          rate;
+            double          gain;
+            double          freq;
+            boost::uint64_t bits;
+        };
+
+        //Actions
+        static const boost::uint32_t ACTION_SET_GAIN            = 10;
+        static const boost::uint32_t ACTION_SET_CLOCK_RATE      = 11;
+        static const boost::uint32_t ACTION_SET_ACTIVE_CHANS    = 12;
+        static const boost::uint32_t ACTION_TUNE                = 13;
+        static const boost::uint32_t ACTION_SET_LOOPBACK        = 14;
+
+        //Values for "which"
+        static const boost::uint32_t CHAIN_NONE = 0;
+        static const boost::uint32_t CHAIN_TX1  = 1;
+        static const boost::uint32_t CHAIN_TX2  = 2;
+        static const boost::uint32_t CHAIN_RX1  = 3;
+        static const boost::uint32_t CHAIN_RX2  = 4;
+    };
+
+    static sptr make(uhd::transport::zero_copy_if::sptr xport);
+};
+
+}}};
+
+#endif /* INCLUDED_E300_REMOTE_CODEC_CTRL_HPP */
diff --git a/host/lib/usrp/e300/e300_sensor_manager.cpp b/host/lib/usrp/e300/e300_sensor_manager.cpp
new file mode 100644
index 000000000..5e65b8fd3
--- /dev/null
+++ b/host/lib/usrp/e300/e300_sensor_manager.cpp
@@ -0,0 +1,289 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "e300_sensor_manager.hpp"
+
+#include <boost/thread.hpp>
+#include <boost/assign/list_of.hpp>
+#include <boost/format.hpp>
+
+#include <cstring>
+#include <uhd/exception.hpp>
+#include <uhd/utils/byteswap.hpp>
+#include <uhd/usrp/gps_ctrl.hpp>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+class e300_sensor_proxy : public e300_sensor_manager
+{
+public:
+    e300_sensor_proxy(
+        uhd::transport::zero_copy_if::sptr xport) : _xport(xport)
+    {
+    }
+
+    std::vector<std::string> get_sensors()
+    {
+        return boost::assign::list_of("temp")("gps_locked")("gps_time");
+    }
+
+    uhd::sensor_value_t get_sensor(const std::string &key)
+    {
+        if (key == "temp")
+            return get_mb_temp();
+        else if (key == "gps_locked")
+            return get_gps_lock();
+        else if (key == "gps_time")
+            return get_gps_time();
+        else
+            throw uhd::lookup_error(
+                str(boost::format("Invalid sensor %s requested.") % key));
+    }
+
+    uhd::sensor_value_t get_mb_temp(void)
+    {
+        boost::mutex::scoped_lock(_mutex);
+        sensor_transaction_t transaction;
+        transaction.which = uhd::htonx<boost::uint32_t>(ZYNQ_TEMP);
+        {
+            uhd::transport::managed_send_buffer::sptr buff
+                = _xport->get_send_buff(1.0);
+            if (not buff or buff->size() < sizeof(transaction)) {
+                throw uhd::runtime_error("sensor proxy send timeout");
+            }
+            std::memcpy(
+                buff->cast<void *>(),
+                &transaction,
+                sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+        {
+            uhd::transport::managed_recv_buffer::sptr buff
+                = _xport->get_recv_buff(1.0);
+
+            if (not buff or buff->size() < sizeof(transaction))
+                throw uhd::runtime_error("sensor proxy recv timeout");
+
+            std::memcpy(
+                &transaction,
+                buff->cast<const void *>(),
+                sizeof(transaction));
+        }
+        UHD_ASSERT_THROW(uhd::ntohx<boost::uint32_t>(transaction.which) == ZYNQ_TEMP);
+        // TODO: Use proper serialization here ...
+        return sensor_value_t(
+            "temp",
+            e300_sensor_manager::unpack_float_from_uint32_t(
+                uhd::ntohx(transaction.value)),
+            "C");
+    }
+
+    uhd::sensor_value_t get_gps_time(void)
+    {
+        boost::mutex::scoped_lock(_mutex);
+        sensor_transaction_t transaction;
+        transaction.which = uhd::htonx<boost::uint32_t>(GPS_TIME);
+        {
+            uhd::transport::managed_send_buffer::sptr buff
+                = _xport->get_send_buff(1.0);
+            if (not buff or buff->size() < sizeof(transaction)) {
+                throw uhd::runtime_error("sensor proxy send timeout");
+            }
+            std::memcpy(
+                buff->cast<void *>(),
+                &transaction,
+                sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+        {
+            uhd::transport::managed_recv_buffer::sptr buff
+                = _xport->get_recv_buff(1.0);
+
+            if (not buff or buff->size() < sizeof(transaction))
+                throw uhd::runtime_error("sensor proxy recv timeout");
+
+            std::memcpy(
+                &transaction,
+                buff->cast<const void *>(),
+                sizeof(transaction));
+        }
+        UHD_ASSERT_THROW(uhd::ntohx<boost::uint32_t>(transaction.which) == GPS_TIME);
+        // TODO: Use proper serialization here ...
+        return sensor_value_t("GPS epoch time", int(uhd::ntohx<boost::uint32_t>(transaction.value)), "seconds");
+    }
+
+    bool get_gps_found(void)
+    {
+        boost::mutex::scoped_lock(_mutex);
+        sensor_transaction_t transaction;
+        transaction.which = uhd::htonx<boost::uint32_t>(GPS_FOUND);
+        {
+            uhd::transport::managed_send_buffer::sptr buff
+                = _xport->get_send_buff(1.0);
+            if (not buff or buff->size() < sizeof(transaction)) {
+                throw uhd::runtime_error("sensor proxy send timeout");
+            }
+            std::memcpy(
+                buff->cast<void *>(),
+                &transaction,
+                sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+        {
+            uhd::transport::managed_recv_buffer::sptr buff
+                = _xport->get_recv_buff(1.0);
+
+            if (not buff or buff->size() < sizeof(transaction))
+                throw uhd::runtime_error("sensor proxy recv timeout");
+
+            std::memcpy(
+                &transaction,
+                buff->cast<const void *>(),
+                sizeof(transaction));
+        }
+        UHD_ASSERT_THROW(uhd::ntohx<boost::uint32_t>(transaction.which) == GPS_FOUND);
+        // TODO: Use proper serialization here ...
+        return static_cast<bool>(uhd::ntohx(transaction.value));
+    }
+
+    uhd::sensor_value_t get_gps_lock(void)
+    {
+        boost::mutex::scoped_lock(_mutex);
+        sensor_transaction_t transaction;
+        transaction.which = uhd::htonx<boost::uint32_t>(GPS_LOCK);
+        {
+            uhd::transport::managed_send_buffer::sptr buff
+                = _xport->get_send_buff(1.0);
+            if (not buff or buff->size() < sizeof(transaction)) {
+                throw uhd::runtime_error("sensor proxy send timeout");
+            }
+            std::memcpy(
+                buff->cast<void *>(),
+                &transaction,
+                sizeof(transaction));
+            buff->commit(sizeof(transaction));
+        }
+        {
+            uhd::transport::managed_recv_buffer::sptr buff
+                = _xport->get_recv_buff(1.0);
+
+            if (not buff or buff->size() < sizeof(transaction))
+                throw uhd::runtime_error("sensor proxy recv timeout");
+
+            std::memcpy(
+                &transaction,
+                buff->cast<const void *>(),
+                sizeof(transaction));
+        }
+        UHD_ASSERT_THROW(uhd::ntohx<boost::uint32_t>(transaction.which) == GPS_LOCK);
+        // TODO: Use proper serialization here ...
+        return sensor_value_t("GPS lock status", static_cast<bool>(uhd::ntohx(transaction.value)), "locked", "unlocked");
+    }
+
+private:
+    uhd::transport::zero_copy_if::sptr _xport;
+    boost::mutex                       _mutex;
+};
+
+}}} // namespace
+
+using namespace uhd::usrp::e300;
+
+e300_sensor_manager::sptr e300_sensor_manager::make_proxy(
+    uhd::transport::zero_copy_if::sptr xport)
+{
+    return sptr(new e300_sensor_proxy(xport));
+}
+
+#ifdef E300_NATIVE
+#include "e300_fifo_config.hpp"
+
+namespace uhd { namespace usrp { namespace e300 {
+
+static const std::string E300_TEMP_SYSFS = "iio:device0";
+
+class e300_sensor_local : public e300_sensor_manager
+{
+public:
+    e300_sensor_local(uhd::gps_ctrl::sptr gps_ctrl) : _gps_ctrl(gps_ctrl)
+    {
+    }
+
+    std::vector<std::string> get_sensors()
+    {
+        return boost::assign::list_of("temp")("gps_locked")("gps_time");
+    }
+
+    uhd::sensor_value_t get_sensor(const std::string &key)
+    {
+        if (key == "temp")
+            return get_mb_temp();
+        else if (key == "gps_locked")
+            return get_gps_lock();
+        else if (key == "gps_time")
+            return get_gps_time();
+        else
+            throw uhd::lookup_error(
+                str(boost::format("Invalid sensor %s requested.") % key));
+    }
+
+    uhd::sensor_value_t get_mb_temp(void)
+    {
+        double scale = boost::lexical_cast<double>(
+            e300_get_sysfs_attr(E300_TEMP_SYSFS, "in_temp0_scale"));
+        unsigned long raw = boost::lexical_cast<unsigned long>(
+            e300_get_sysfs_attr(E300_TEMP_SYSFS, "in_temp0_raw"));
+        unsigned long offset = boost::lexical_cast<unsigned long>(
+            e300_get_sysfs_attr(E300_TEMP_SYSFS, "in_temp0_offset"));
+        return sensor_value_t("temp", (raw + offset) * scale / 1000, "C");
+    }
+
+    bool get_gps_found(void)
+    {
+        return _gps_ctrl->gps_detected();
+    }
+
+    uhd::sensor_value_t get_gps_lock(void)
+    {
+        return _gps_ctrl->get_sensor("gps_locked");
+    }
+
+    uhd::sensor_value_t get_gps_time(void)
+    {
+        return _gps_ctrl->get_sensor("gps_time");
+    }
+
+private:
+    gps_ctrl::sptr _gps_ctrl;
+};
+}}}
+
+using namespace uhd::usrp::e300;
+e300_sensor_manager::sptr e300_sensor_manager::make_local(
+    uhd::gps_ctrl::sptr gps_ctrl)
+{
+    return sptr(new e300_sensor_local(gps_ctrl));
+}
+
+#else
+using namespace uhd::usrp::e300;
+e300_sensor_manager::sptr e300_sensor_manager::make_local(
+    uhd::gps_ctrl::sptr gps_ctrl)
+{
+    throw uhd::assertion_error("e300_sensor_manager::make_local() !E300_NATIVE");
+}
+#endif
diff --git a/host/lib/usrp/e300/e300_sensor_manager.hpp b/host/lib/usrp/e300/e300_sensor_manager.hpp
new file mode 100644
index 000000000..503a7bb63
--- /dev/null
+++ b/host/lib/usrp/e300/e300_sensor_manager.hpp
@@ -0,0 +1,77 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include <boost/noncopyable.hpp>
+#include <boost/cstdint.hpp>
+
+#include <uhd/transport/zero_copy.hpp>
+#include <uhd/types/sensors.hpp>
+#include <uhd/utils/byteswap.hpp>
+#include <uhd/usrp/gps_ctrl.hpp>
+
+#ifndef INCLUDED_E300_SENSOR_MANAGER_HPP
+#define INCLUDED_E300_SENSOR_MANAGER_HPP
+
+namespace uhd { namespace usrp { namespace e300 {
+
+struct sensor_transaction_t {
+    boost::uint32_t which;
+    union {
+        boost::uint32_t value;
+        boost::uint32_t value64;
+    };
+};
+
+
+
+enum sensor {ZYNQ_TEMP=0, GPS_FOUND=1, GPS_TIME=2,
+             GPS_LOCK=3};
+
+class e300_sensor_manager : boost::noncopyable
+{
+public:
+    typedef boost::shared_ptr<e300_sensor_manager> sptr;
+    virtual bool get_gps_found(void) = 0;
+
+    virtual uhd::sensor_value_t get_sensor(const std::string &key) = 0;
+    virtual std::vector<std::string> get_sensors(void) = 0;
+
+    virtual uhd::sensor_value_t get_mb_temp(void) = 0;
+    virtual uhd::sensor_value_t get_gps_lock(void) = 0;
+    virtual uhd::sensor_value_t get_gps_time(void) = 0;
+
+    static sptr make_proxy(uhd::transport::zero_copy_if::sptr xport);
+    static sptr make_local(uhd::gps_ctrl::sptr gps_ctrl);
+
+    // Note: This is a hack
+    static boost::uint32_t pack_float_in_uint32_t(const float &v)
+    {
+        const boost::uint32_t *cast = reinterpret_cast<const uint32_t*>(&v);
+        return *cast;
+    }
+
+    static float unpack_float_from_uint32_t(const boost::uint32_t &v)
+    {
+        const float *cast = reinterpret_cast<const float*>(&v);
+        return *cast;
+    }
+};
+
+
+}}} // namespace
+
+#endif // INCLUDED_E300_SENSOR_MANAGER_HPP
diff --git a/host/lib/usrp/e300/e300_spi.cpp b/host/lib/usrp/e300/e300_spi.cpp
new file mode 100644
index 000000000..9a2daf4a7
--- /dev/null
+++ b/host/lib/usrp/e300/e300_spi.cpp
@@ -0,0 +1,127 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include <uhd/config.hpp>
+#include <uhd/exception.hpp>
+#include "e300_spi.hpp"
+
+#ifdef E300_NATIVE
+#include <boost/thread.hpp>
+#include <boost/format.hpp>
+
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/types.h>
+#include <linux/spi/spidev.h>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+class spidev_impl : public spi
+{
+public:
+
+    spidev_impl(const std::string &device)
+                          : _mode(SPI_CPHA),
+                            _speed(2000000),
+                            _bits(8),
+                            _delay(0)
+    {
+        int ret;
+        _fd = open(device.c_str(), O_RDWR);
+        if (_fd < 0)
+            throw uhd::runtime_error(str(boost::format("Could not open spidev device %s") % device));
+
+        ret = ioctl(_fd, SPI_IOC_WR_MODE, &_mode);
+        if (ret == -1)
+            throw uhd::runtime_error("Could not set spidev mode");
+
+        ret = ioctl(_fd, SPI_IOC_RD_MODE, &_mode);
+        if (ret == -1)
+            throw uhd::runtime_error("Could not get spidev mode");
+
+        ret = ioctl(_fd, SPI_IOC_WR_BITS_PER_WORD, &_bits);
+        if (ret == -1)
+            throw uhd::runtime_error("Could not set spidev bits per word");
+
+        ret = ioctl(_fd, SPI_IOC_RD_BITS_PER_WORD, &_bits);
+        if (ret == -1)
+            throw uhd::runtime_error("Could not get spidev bits per word");
+
+        ret = ioctl(_fd, SPI_IOC_WR_MAX_SPEED_HZ, &_speed);
+        if (ret == -1)
+            throw uhd::runtime_error("Could not set spidev max speed");
+
+        ret = ioctl(_fd, SPI_IOC_RD_MAX_SPEED_HZ, &_speed);
+        if (ret == -1)
+            throw uhd::runtime_error("Could not get spidev max speed");
+    }
+
+    virtual ~spidev_impl()
+    {
+        close(_fd);
+    }
+
+    boost::uint32_t transact_spi(int, const uhd::spi_config_t &,
+                                 boost::uint32_t data, size_t num_bits,
+                                 bool)
+    {
+        int ret(0);
+        struct spi_ioc_transfer tr;
+
+        uint8_t *tx_data = reinterpret_cast<uint8_t *>(&data);
+
+
+        UHD_ASSERT_THROW(num_bits == 24);
+        uint8_t tx[] = {tx_data[2], tx_data[1], tx_data[0]};
+
+        uint8_t rx[3];
+        tr.tx_buf = (unsigned long) &tx[0];
+        tr.rx_buf = (unsigned long) &rx[0];
+        tr.len = num_bits >> 3;
+        tr.bits_per_word = _bits;
+        tr.speed_hz = _speed;
+        tr.delay_usecs = _delay;
+
+        ret = ioctl(_fd, SPI_IOC_MESSAGE(1), &tr);
+        if (ret < 1)
+            throw uhd::runtime_error("Could not send spidev message");
+
+        return rx[2];
+    }
+
+private:
+    int _fd;
+    boost::uint8_t _mode;
+    boost::uint32_t _speed;
+    boost::uint8_t _bits;
+    boost::uint16_t _delay;
+};
+
+spi::sptr spi::make(const std::string &device)
+{
+    return spi::sptr(new spidev_impl(device));
+}
+}}};
+#else
+namespace uhd { namespace usrp { namespace e300 {
+
+spi::sptr spi::make(const std::string &)
+{
+    throw uhd::assertion_error("spi::make() !E300_NATIVE");
+}
+}}};
+#endif //E300_NATIVE
diff --git a/host/lib/usrp/e300/e300_spi.hpp b/host/lib/usrp/e300/e300_spi.hpp
new file mode 100644
index 000000000..67e990aaa
--- /dev/null
+++ b/host/lib/usrp/e300/e300_spi.hpp
@@ -0,0 +1,34 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_E300_SPI_HPP
+#define INCLUDED_E300_SPI_HPP
+
+#include <uhd/types/serial.hpp>
+
+namespace uhd { namespace usrp { namespace e300 {
+
+class spi : public virtual uhd::spi_iface
+{
+public:
+    typedef boost::shared_ptr<spi> sptr;
+    static sptr make(const std::string &device);
+};
+
+}}};
+
+#endif /* INCLUDED_E300_SPI_HPP */
diff --git a/host/lib/usrp/e300/e300_sysfs_hooks.cpp b/host/lib/usrp/e300/e300_sysfs_hooks.cpp
new file mode 100644
index 000000000..fdeaf0858
--- /dev/null
+++ b/host/lib/usrp/e300/e300_sysfs_hooks.cpp
@@ -0,0 +1,121 @@
+//
+// Copyright 2013-2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifdef E300_NATIVE
+
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+
+#include <libudev.h>
+
+#include <boost/format.hpp>
+#include <boost/lexical_cast.hpp>
+
+#include <uhd/utils/msg.hpp>
+#include <uhd/exception.hpp>
+
+static const std::string E300_AXI_FPGA_SYSFS = "40000000.axi-fpga";
+static const std::string E300_XDEV_SYSFS = "f8007000.ps7-dev-cfg";
+
+std::string e300_get_sysfs_attr(const std::string &node, const std::string &attr)
+{
+    udev *udev;
+    udev_enumerate *enumerate;
+    udev_list_entry *devices, *dev_list_entry;
+    udev_device *dev;
+    std::string retstring;
+
+    udev = udev_new();
+
+    if (!udev) {
+        throw uhd::lookup_error("Failed to get udev handle.");
+    }
+
+    enumerate = udev_enumerate_new(udev);
+    udev_enumerate_add_match_sysname(enumerate, node.c_str());
+    udev_enumerate_scan_devices(enumerate);
+    devices = udev_enumerate_get_list_entry(enumerate);
+
+    udev_list_entry_foreach(dev_list_entry, devices)
+    {
+        const char *path;
+
+        path = udev_list_entry_get_name(dev_list_entry);
+        dev = udev_device_new_from_syspath(udev, path);
+
+       retstring = udev_device_get_sysattr_value(dev, attr.c_str());
+       if (retstring.size())
+           break;
+    }
+
+    udev_enumerate_unref(enumerate);
+    udev_unref(udev);
+
+    return retstring;
+}
+
+static bool e300_fpga_loaded_successfully(void)
+{
+    return boost::lexical_cast<bool>(e300_get_sysfs_attr(E300_XDEV_SYSFS, "prog_done"));
+}
+
+#include "e300_fifo_config.hpp"
+#include <uhd/exception.hpp>
+
+e300_fifo_config_t e300_read_sysfs(void)
+{
+
+    if (not e300_fpga_loaded_successfully())
+    {
+        throw uhd::runtime_error("E300 FPGA load failed!");
+    }
+
+    e300_fifo_config_t config;
+
+    config.buff_length  = boost::lexical_cast<unsigned long>(
+        e300_get_sysfs_attr(E300_AXI_FPGA_SYSFS, "buffer_length"));
+    config.ctrl_length = boost::lexical_cast<unsigned long>(
+        e300_get_sysfs_attr(E300_AXI_FPGA_SYSFS, "control_length"));
+    config.phys_addr = boost::lexical_cast<unsigned long>(
+        e300_get_sysfs_attr(E300_AXI_FPGA_SYSFS, "phys_addr"));
+
+    return config;
+}
+
+#else //E300_NATIVE
+
+#include "e300_fifo_config.hpp"
+#include <uhd/exception.hpp>
+
+e300_fifo_config_t e300_read_sysfs(void)
+{
+    throw uhd::assertion_error("e300_read_sysfs() !E300_NATIVE");
+}
+
+std::string e300_get_sysfs_attr(const std::string &, const std::string &)
+{
+    throw uhd::assertion_error("e300_sysfs_attr() !E300_NATIVE");
+}
+
+#endif //E300_NATIVE
diff --git a/host/lib/usrp/e300/e300_ublox_control.hpp b/host/lib/usrp/e300/e300_ublox_control.hpp
new file mode 100644
index 000000000..8705d6c52
--- /dev/null
+++ b/host/lib/usrp/e300/e300_ublox_control.hpp
@@ -0,0 +1,50 @@
+#ifndef INCLUDED_UHD_USRP_UBLOX_CONTROL_HPP
+#define INCLUDED_UHD_USRP_UBLOX_CONTROL_HPP
+
+#include <boost/cstdint.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/asio.hpp>
+#include <uhd/config.hpp>
+#include <uhd/usrp/gps_ctrl.hpp>
+#include <uhd/types/sensors.hpp>
+
+#include "e300_async_serial.hpp"
+
+namespace uhd { namespace usrp { namespace gps {
+
+namespace ublox { namespace ubx {
+
+class control : public virtual uhd::gps_ctrl
+{
+public:
+    typedef boost::shared_ptr<control> sptr;
+
+    static sptr make(const std::string &node, const size_t baud_rate);
+
+    virtual void configure_message_rate(
+        const boost::uint16_t msg,
+        const boost::uint8_t rate) = 0;
+
+    virtual void configure_antenna(
+        const boost::uint16_t flags,
+        const boost::uint16_t pins) = 0;
+
+    virtual void configure_pps(
+        const boost::uint32_t interval,
+        const boost::uint32_t length,
+        const boost::int8_t status,
+        const boost::uint8_t time_ref,
+        const boost::uint8_t flags,
+        const boost::int16_t antenna_delay,
+        const boost::int16_t rf_group_delay,
+        const boost::int32_t user_delay) = 0;
+
+    virtual void configure_rates(
+        boost::uint16_t meas_rate,
+        boost::uint16_t nav_rate,
+        boost::uint16_t time_ref) = 0;
+};
+}} // namespace ublox::ubx
+
+}}} // namespace
+#endif // INCLUDED_UHD_USRP_UBLOX_CONTROL_HPP
diff --git a/host/lib/usrp/e300/e300_ublox_control_impl.cpp b/host/lib/usrp/e300/e300_ublox_control_impl.cpp
new file mode 100644
index 000000000..a0ec10271
--- /dev/null
+++ b/host/lib/usrp/e300/e300_ublox_control_impl.cpp
@@ -0,0 +1,505 @@
+#include <boost/format.hpp>
+#include <boost/foreach.hpp>
+#include <boost/bind.hpp>
+#include <boost/make_shared.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/assign/list_of.hpp>
+#include "boost/date_time/posix_time/posix_time.hpp"
+
+#include <iostream>
+
+
+#include <uhd/utils/byteswap.hpp>
+#include <uhd/utils/msg.hpp>
+#include <uhd/exception.hpp>
+
+#include "e300_ublox_control.hpp"
+
+#ifdef E300_NATIVE
+#include "e300_ublox_control_impl.hpp"
+
+
+namespace uhd { namespace usrp { namespace gps {
+
+namespace ublox { namespace ubx {
+
+control_impl::control_impl(const std::string &node, const size_t baud_rate)
+{
+    _decode_init();
+    _serial = boost::make_shared<async_serial>(node, baud_rate);
+    _serial->set_read_callback(boost::bind(&control_impl::_rx_callback, this, _1, _2));
+
+    _detect();
+
+    configure_message_rate(MSG_GLL, 0);
+    configure_message_rate(MSG_GSV, 0);
+    configure_message_rate(MSG_GGA, 0);
+    configure_message_rate(MSG_GSA, 0);
+    configure_message_rate(MSG_RMC, 0);
+    configure_message_rate(MSG_VTG, 0);
+    configure_message_rate(MSG_NAV_TIMEUTC, 1);
+    configure_message_rate(MSG_NAV_SOL, 1);
+
+    configure_antenna(0x001b, 0x8251);
+
+    configure_pps(0xf4240, 0x3d090, 1, 0 /* utc */, 1, 0, 0, 0);
+
+    _sensors = boost::assign::list_of("gps_locked")("gps_time");
+}
+
+bool control_impl::gps_detected(void)
+{
+    return _detected;
+}
+
+void control_impl::_detect(void)
+{
+    _send_message(MSG_MON_VER, NULL, 0);
+}
+
+std::vector<std::string> control_impl::get_sensors(void)
+{
+    return _sensors;
+}
+
+uhd::sensor_value_t control_impl::get_sensor(std::string key)
+{
+    if (key == "gps_time") {
+        return sensor_value_t("GPS epoch time", int(_get_epoch_time()), "seconds");
+    } else if (key == "gps_locked") {
+        bool lock;
+        _locked.wait_and_see(lock);
+        return sensor_value_t("GPS lock status", lock, "locked", "unlocked");
+    } else
+        throw uhd::key_error(str(boost::format("sensor %s unknown.") % key));
+}
+
+std::time_t control_impl::_get_epoch_time(void)
+{
+    boost::posix_time::ptime ptime;
+    _ptime.wait_and_see(ptime);
+    return (ptime - boost::posix_time::from_time_t(0)).total_seconds();
+}
+
+control_impl::~control_impl(void)
+{
+    // turn it all off again
+    configure_antenna(0x001a, 0x8251);
+    configure_pps(0xf4240, 0x3d090, 1, 1, 0, 0, 0, 0);
+}
+
+void control_impl::_decode_init(void)
+{
+    _decode_state = DECODE_SYNC1;
+    _rx_ck_a = 0;
+    _rx_ck_b = 0;
+    _rx_payload_length = 0;
+    _rx_payload_index  = 0;
+}
+
+void control_impl::_add_byte_to_checksum(const boost::uint8_t b)
+{
+    _rx_ck_a = _rx_ck_a + b;
+    _rx_ck_b = _rx_ck_b + _rx_ck_a;
+}
+
+void control_impl::_calc_checksum(
+    const boost::uint8_t *buffer,
+    const boost::uint16_t length,
+    checksum_t &checksum)
+{
+    for (size_t i = 0; i < length; i++)
+    {
+        checksum.ck_a = checksum.ck_a + buffer[i];
+        checksum.ck_b = checksum.ck_b + checksum.ck_a;
+    }
+}
+
+void control_impl::configure_rates(
+    boost::uint16_t meas_rate,
+    boost::uint16_t nav_rate,
+    boost::uint16_t time_ref)
+{
+    payload_tx_cfg_rate_t cfg_rate;
+    cfg_rate.meas_rate = uhd::htowx<boost::uint16_t>(meas_rate);
+    cfg_rate.nav_rate = uhd::htowx<boost::uint16_t>(nav_rate);
+    cfg_rate.time_ref = uhd::htowx<boost::uint16_t>(time_ref);
+
+    _send_message(
+        MSG_CFG_RATE,
+        reinterpret_cast<const uint8_t*>(&cfg_rate),
+        sizeof(cfg_rate));
+
+    _wait_for_ack(MSG_CFG_RATE, 1.0);
+}
+
+void control_impl::configure_message_rate(
+    const boost::uint16_t msg,
+    const uint8_t rate)
+{
+    payload_tx_cfg_msg_t cfg_msg;
+    cfg_msg.msg  = uhd::htowx<boost::uint16_t>(msg);
+    cfg_msg.rate[0] = 0;//rate;
+    cfg_msg.rate[1] = rate;
+    cfg_msg.rate[2] = 0;//rate;
+    cfg_msg.rate[3] = 0;//rate;
+    cfg_msg.rate[4] = 0;//rate;
+    cfg_msg.rate[5] = 0;//rate;
+    _send_message(
+        MSG_CFG_MSG,
+        reinterpret_cast<const uint8_t*>(&cfg_msg),
+        sizeof(cfg_msg));
+
+    _wait_for_ack(MSG_CFG_MSG, 1.0);
+}
+
+void control_impl::configure_antenna(
+    const boost::uint16_t flags,
+    const boost::uint16_t pins)
+{
+    payload_tx_cfg_ant_t cfg_ant;
+    cfg_ant.pins = uhd::htowx<boost::uint16_t>(pins);
+    cfg_ant.flags = uhd::htowx<boost::uint16_t>(flags);
+    _send_message(
+        MSG_CFG_ANT,
+        reinterpret_cast<const uint8_t*>(&cfg_ant),
+        sizeof(cfg_ant));
+    if (_wait_for_ack(MSG_CFG_ANT, 1.0) < 0) {
+        throw uhd::runtime_error("Didn't get an ACK for antenna configuration.");
+    }
+
+}
+
+void control_impl::configure_pps(
+    const boost::uint32_t interval,
+    const boost::uint32_t length,
+    const boost::int8_t status,
+    const boost::uint8_t time_ref,
+    const boost::uint8_t flags,
+    const boost::int16_t antenna_delay,
+    const boost::int16_t rf_group_delay,
+    const boost::int32_t user_delay)
+{
+    payload_tx_cfg_tp_t cfg_tp;
+    cfg_tp.interval = uhd::htowx<boost::uint32_t>(interval);
+    cfg_tp.length = uhd::htowx<boost::uint32_t>(length);
+    cfg_tp.status = status;
+    cfg_tp.time_ref = time_ref;
+    cfg_tp.flags = flags;
+    cfg_tp.antenna_delay = uhd::htowx<boost::int16_t>(antenna_delay);
+    cfg_tp.rf_group_delay = uhd::htowx<boost::int16_t>(rf_group_delay);
+    cfg_tp.user_delay = uhd::htowx<boost::int32_t>(user_delay);
+    _send_message(
+        MSG_CFG_TP,
+        reinterpret_cast<const uint8_t*>(&cfg_tp),
+        sizeof(cfg_tp));
+    if (_wait_for_ack(MSG_CFG_TP, 1.0) < 0) {
+        throw uhd::runtime_error("Didn't get an ACK for PPS configuration.");
+    }
+}
+
+
+void control_impl::_rx_callback(const char *data, unsigned int len)
+{
+    //std::cout << "IN RX CALLBACK" << std::flush << std::endl;
+    std::vector<char> v(data, data+len);
+    BOOST_FOREACH(const char &c, v)
+    {
+        _parse_char(c);
+    }
+}
+
+void control_impl::_parse_char(const boost::uint8_t b)
+{
+    int ret = 0;
+
+    switch (_decode_state) {
+
+    // we're expecting the first sync byte
+    case DECODE_SYNC1:
+        if (b == SYNC1) { // sync1 found goto next step
+            _decode_state = DECODE_SYNC2;
+        } // else stay around
+        break;
+
+    // we're expecting the second sync byte
+    case DECODE_SYNC2:
+        if (b == SYNC2) { // sync2 found goto next step
+            _decode_state = DECODE_CLASS;
+        } else {
+            // failed, reset
+            _decode_init();
+        }
+        break;
+
+    // we're expecting the class byte
+    case DECODE_CLASS:
+        _add_byte_to_checksum(b);
+        _rx_msg = b;
+        _decode_state = DECODE_ID;
+        break;
+
+    // we're expecting the id byte
+    case DECODE_ID:
+        _add_byte_to_checksum(b);
+        _rx_msg |= (b << 8);
+        _decode_state = DECODE_LENGTH1;
+        break;
+
+    // we're expecting the first length byte
+    case DECODE_LENGTH1:
+        _add_byte_to_checksum(b);
+        _rx_payload_length = b;
+        _decode_state = DECODE_LENGTH2;
+        break;
+
+    // we're expecting the second length byte
+    case DECODE_LENGTH2:
+        _add_byte_to_checksum(b);
+        _rx_payload_length |= (b << 8);
+        if(_payload_rx_init()) {
+            _decode_init(); // we failed, give up for this one
+        } else {
+            _decode_state = _rx_payload_length ?
+                DECODE_PAYLOAD : DECODE_CHKSUM1;
+        }
+        break;
+
+    // we're expecting payload
+    case DECODE_PAYLOAD:
+        _add_byte_to_checksum(b);
+        switch(_rx_msg) {
+        default:
+            ret = _payload_rx_add(b);
+            break;
+        };
+        if (ret < 0) {
+            // we couldn't deal with the payload, discard the whole thing
+            _decode_init();
+        } else if (ret > 0) {
+            // payload was complete, let's check the checksum;
+            _decode_state = DECODE_CHKSUM1;
+        } else {
+            // more payload expected, don't move
+        }
+        ret = 0;
+        break;
+
+    case DECODE_CHKSUM1:
+        if (_rx_ck_a != b) {
+            // checksum didn't match, barf
+            std::cout << boost::format("Failed checksum byte1 %lx != %lx")
+                % int(_rx_ck_a) % int(b) << std::endl;
+            _decode_init();
+        } else {
+            _decode_state = DECODE_CHKSUM2;
+        }
+        break;
+
+    case DECODE_CHKSUM2:
+        if (_rx_ck_b != b) {
+            // checksum didn't match, barf
+            std::cout << boost::format("Failed checksum byte2 %lx != %lx")
+                % int(_rx_ck_b) % int(b) << std::endl;
+
+        } else {
+            ret = _payload_rx_done(); // payload done
+        }
+        _decode_init();
+        break;
+
+    default:
+        break;
+    };
+}
+
+int control_impl::_payload_rx_init(void)
+{
+    int ret = 0;
+
+    _rx_state = RXMSG_HANDLE; // by default handle
+    switch(_rx_msg) {
+
+    case MSG_NAV_SOL:
+        if (not (_rx_payload_length == sizeof(payload_rx_nav_sol_t)))
+            _rx_state = RXMSG_ERROR_LENGTH;
+        break;
+
+    case MSG_NAV_TIMEUTC:
+        if (not (_rx_payload_length == sizeof(payload_rx_nav_timeutc_t)))
+            _rx_state = RXMSG_ERROR_LENGTH;
+        break;
+
+    case MSG_MON_VER:
+        break; // always take this one
+
+    case MSG_ACK_ACK:
+        if (not (_rx_payload_length == sizeof(payload_rx_ack_ack_t)))
+            _rx_state = RXMSG_ERROR_LENGTH;
+        break;
+
+    case MSG_ACK_NAK:
+        if (not (_rx_payload_length == sizeof(payload_rx_ack_nak_t)))
+            _rx_state = RXMSG_ERROR_LENGTH;
+        break;
+
+    default:
+        _rx_state = RXMSG_DISABLE;
+        break;
+    };
+
+    switch (_rx_state) {
+    case RXMSG_HANDLE: // handle message
+    case RXMSG_IGNORE: // ignore message but don't report error
+        ret = 0;
+        break;
+    case RXMSG_DISABLE: // ignore message but don't report error
+    case RXMSG_ERROR_LENGTH: // the length doesn't match
+        ret = -1;
+        break;
+    default: // invalid, error
+        ret = -1;
+        break;
+    };
+
+    return ret;
+}
+
+int control_impl::_payload_rx_add(const boost::uint8_t b)
+{
+    int ret = 0;
+    _buf.raw[_rx_payload_index] = b;
+    if (++_rx_payload_index >= _rx_payload_length)
+        ret = 1;
+    return ret;
+}
+
+int control_impl::_payload_rx_done(void)
+{
+    int ret = 0;
+    if (_rx_state != RXMSG_HANDLE) {
+        return 0;
+    }
+
+    switch (_rx_msg) {
+    case MSG_MON_VER:
+        _detected = true;
+        break;
+
+    case MSG_MON_HW:
+        std::cout << "MON-HW" << std::endl;
+        break;
+
+    case MSG_ACK_ACK:
+        if ((_ack_state == ACK_WAITING) and (_buf.payload_rx_ack_ack.msg == _ack_waiting_msg))
+            _ack_state = ACK_GOT_ACK;
+        break;
+
+    case MSG_ACK_NAK:
+        if ((_ack_state == ACK_WAITING) and (_buf.payload_rx_ack_nak.msg == _ack_waiting_msg))
+            _ack_state = ACK_GOT_NAK;
+
+        break;
+
+    case MSG_CFG_ANT:
+        break;
+
+    case MSG_NAV_TIMEUTC:
+        _ptime.update(boost::posix_time::ptime(
+            boost::gregorian::date(
+                boost::gregorian::greg_year(uhd::wtohx<boost::uint16_t>(
+                    _buf.payload_rx_nav_timeutc.year)),
+                boost::gregorian::greg_month(_buf.payload_rx_nav_timeutc.month),
+                boost::gregorian::greg_day(_buf.payload_rx_nav_timeutc.day)),
+            (boost::posix_time::hours(_buf.payload_rx_nav_timeutc.hour)
+            + boost::posix_time::minutes(_buf.payload_rx_nav_timeutc.min)
+            + boost::posix_time::seconds(_buf.payload_rx_nav_timeutc.sec))));
+        break;
+
+    case MSG_NAV_SOL:
+        _locked.update(_buf.payload_rx_nav_sol.gps_fix > 0);
+        break;
+
+    default:
+        std::cout << boost::format("Got unknown message %lx , with good checksum [") % int(_rx_msg);
+        for(size_t i = 0; i < _rx_payload_length; i++)
+            std::cout << boost::format("%lx, ") % int(_buf.raw[i]);
+        std::cout << "]"<< std::endl;
+        break;
+    };
+    return ret;
+}
+
+void control_impl::_send_message(
+    const boost::uint16_t msg,
+    const boost::uint8_t *payload,
+    const boost::uint16_t len)
+{
+    header_t header = {SYNC1, SYNC2, msg, len};
+    checksum_t checksum = {0, 0};
+
+    // calculate checksums, first header without sync
+    // then payload
+    _calc_checksum(
+        reinterpret_cast<boost::uint8_t*>(&header) + 2,
+        sizeof(header) - 2, checksum);
+    if (payload)
+        _calc_checksum(payload, len, checksum);
+
+    _serial->write(
+        reinterpret_cast<const char*>(&header),
+        sizeof(header));
+
+    if (payload)
+        _serial->write((const char *) payload, len);
+
+    _serial->write(
+        reinterpret_cast<const char*>(&checksum),
+        sizeof(checksum));
+}
+
+int control_impl::_wait_for_ack(
+    const boost::uint16_t msg,
+    const double timeout)
+{
+    int ret = -1;
+
+    _ack_state = ACK_WAITING;
+    _ack_waiting_msg = msg;
+
+    boost::system_time timeout_time =
+        boost::get_system_time() +
+        boost::posix_time::milliseconds(timeout * 1000.0);
+
+    do {
+        if(_ack_state == ACK_GOT_ACK)
+            return 0;
+        else if (_ack_state == ACK_GOT_NAK) {
+            return -1;
+        }
+        boost::this_thread::sleep(boost::posix_time::milliseconds(20));
+    } while (boost::get_system_time() < timeout_time);
+
+    // we get here ... it's a timeout
+    _ack_state = ACK_IDLE;
+    return ret;
+}
+
+
+}} // namespace ublox::ubx
+}}} // namespace
+
+using namespace uhd::usrp::gps::ublox::ubx;
+
+control::sptr control::make(const std::string &node, const size_t baud_rate)
+{
+    return control::sptr(new control_impl(node, baud_rate));
+}
+#else
+using namespace uhd::usrp::gps::ublox::ubx;
+
+control::sptr control::make(const std::string &node, const size_t baud_rate)
+{
+    throw uhd::assertion_error("control::sptr::make: !E300_NATIVE");
+}
+#endif // E300_NATIVE
diff --git a/host/lib/usrp/e300/e300_ublox_control_impl.hpp b/host/lib/usrp/e300/e300_ublox_control_impl.hpp
new file mode 100644
index 000000000..a1dcbfe6c
--- /dev/null
+++ b/host/lib/usrp/e300/e300_ublox_control_impl.hpp
@@ -0,0 +1,457 @@
+#ifndef INCLUDED_UHD_USRP_UBLOX_CONTROL_IMPL_HPP
+#define INCLUDED_UHD_USRP_UBLOX_CONTROL_IMPL_HPP
+
+#include <boost/cstdint.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/asio.hpp>
+#include <uhd/config.hpp>
+#include <uhd/usrp/gps_ctrl.hpp>
+#include <uhd/types/sensors.hpp>
+
+#include "e300_async_serial.hpp"
+
+namespace uhd { namespace usrp { namespace gps {
+
+namespace ublox { namespace ubx {
+// ublox binary sync words
+static const boost::uint8_t SYNC1 = 0xB5;
+static const boost::uint8_t SYNC2 = 0x62;
+
+// message classes
+static const boost::uint8_t CLASS_NAV  = 0x01;
+static const boost::uint8_t CLASS_ACK  = 0x05;
+static const boost::uint8_t CLASS_CFG  = 0x06;
+static const boost::uint8_t CLASS_MON  = 0x0a;
+static const boost::uint8_t CLASS_NMEA = 0xf0;
+
+// Message IDs
+static const boost::uint8_t ID_NAV_POSLLH  = 0x02;
+static const boost::uint8_t ID_NAV_SOL     = 0x06;
+static const boost::uint8_t ID_NAV_PVT     = 0x07;
+static const boost::uint8_t ID_NAV_VELNED  = 0x12;
+static const boost::uint8_t ID_NAV_TIMEUTC = 0x21;
+static const boost::uint8_t ID_NAV_SVINFO  = 0x30;
+static const boost::uint8_t ID_ACK_NAK     = 0x00;
+static const boost::uint8_t ID_ACK_ACK     = 0x01;
+static const boost::uint8_t ID_CFG_PRT     = 0x00;
+static const boost::uint8_t ID_CFG_ANT     = 0x13;
+static const boost::uint8_t ID_CFG_TP      = 0x07;
+static const boost::uint8_t ID_CFG_MSG     = 0x01;
+static const boost::uint8_t ID_CFG_RATE    = 0x08;
+static const boost::uint8_t ID_CFG_NAV5    = 0x24;
+static const boost::uint8_t ID_MON_VER     = 0x04;
+static const boost::uint8_t ID_MON_HW      = 0x09;
+static const boost::uint8_t ID_GGA         = 0x00;
+static const boost::uint8_t ID_GLL         = 0x01;
+static const boost::uint8_t ID_GSA         = 0x02;
+static const boost::uint8_t ID_GSV         = 0x03;
+static const boost::uint8_t ID_RMC         = 0x04;
+static const boost::uint8_t ID_VTG         = 0x05;
+static const boost::uint8_t ID_GST         = 0x07;
+
+// Message Classes & IDs //
+static const boost::uint16_t MSG_NAV_POSLLH
+    = CLASS_NAV | (ID_NAV_POSLLH << 8);
+static const boost::uint16_t MSG_NAV_SOL
+    = CLASS_NAV | (ID_NAV_SOL << 8);
+static const boost::uint16_t MSG_NAV_PVT
+    = CLASS_NAV | (ID_NAV_PVT << 8);
+static const boost::uint16_t MSG_NAV_VELNED
+    = CLASS_NAV | (ID_NAV_VELNED << 8);
+static const boost::uint16_t MSG_NAV_TIMEUTC
+    = CLASS_NAV | (ID_NAV_TIMEUTC << 8);
+static const boost::uint16_t MSG_NAV_SVINFO
+    = CLASS_NAV | (ID_NAV_SVINFO << 8);
+static const boost::uint16_t MSG_ACK_NAK
+    = CLASS_ACK | (ID_ACK_NAK << 8);
+static const boost::uint16_t MSG_ACK_ACK
+    = CLASS_ACK | (ID_ACK_ACK << 8);
+static const boost::uint16_t MSG_CFG_PRT
+    = CLASS_CFG | (ID_CFG_PRT << 8);
+static const boost::uint16_t MSG_CFG_ANT
+    = CLASS_CFG | (ID_CFG_ANT << 8);
+static const boost::uint16_t MSG_CFG_TP
+    = CLASS_CFG | (ID_CFG_TP << 8);
+static const boost::uint16_t MSG_CFG_MSG
+    = CLASS_CFG | (ID_CFG_MSG << 8);
+static const boost::uint16_t MSG_CFG_RATE
+    = CLASS_CFG | (ID_CFG_RATE << 8);
+static const boost::uint16_t MSG_CFG_NAV5
+    = CLASS_CFG | (ID_CFG_NAV5 << 8);
+static const boost::uint16_t MSG_MON_HW
+    = CLASS_MON | (ID_MON_HW << 8);
+static const boost::uint16_t MSG_MON_VER
+    = CLASS_MON | (ID_MON_VER << 8);
+
+// NMEA ones
+static const boost::uint16_t MSG_GGA
+    = CLASS_NMEA | (ID_GGA << 8);
+static const boost::uint16_t MSG_GLL
+    = CLASS_NMEA | (ID_GLL << 8);
+static const boost::uint16_t MSG_GSA
+    = CLASS_NMEA | (ID_GSA << 8);
+static const boost::uint16_t MSG_GSV
+    = CLASS_NMEA | (ID_GSV << 8);
+static const boost::uint16_t MSG_RMC
+    = CLASS_NMEA | (ID_RMC << 8);
+static const boost::uint16_t MSG_VTG
+    = CLASS_NMEA | (ID_VTG << 8);
+
+// header
+struct header_t
+{
+    boost::uint8_t sync1;
+    boost::uint8_t sync2;
+    boost::uint16_t msg;
+    boost::uint16_t length;
+};
+
+// checksum
+struct checksum_t
+{
+    boost::uint8_t ck_a;
+    boost::uint8_t ck_b;
+};
+
+// rx rx mon-hw (ubx6)
+struct payload_rx_mon_hw_t
+{
+    boost::uint32_t pin_sel;
+    boost::uint32_t pin_bank;
+    boost::uint32_t pin_dir;
+    boost::uint32_t pin_val;
+    boost::uint16_t noise_per_ms;
+    boost::uint16_t agc_cnt;
+    boost::uint8_t  a_status;
+    boost::uint8_t  a_power;
+    boost::uint8_t  flags;
+    boost::uint8_t  reserved1;
+    boost::uint32_t used_mask;
+    boost::uint8_t  vp[25];
+    boost::uint8_t  jam_ind;
+    boost::uint16_t reserved3;
+    boost::uint32_t pin_irq;
+    boost::uint32_t pullh;
+    boost::uint32_t pulll;
+};
+
+// rx mon-ver
+struct payload_rx_mon_ver_part1_t
+{
+    char sw_version[30];
+    char hw_version[10];
+};
+
+struct payload_rx_mon_ver_part2_t
+{
+    boost::uint8_t extension[30];
+};
+
+// rx ack-ack
+typedef union {
+    boost::uint16_t msg;
+    struct {
+        boost::uint8_t cls_id;
+        boost::uint8_t msg_id;
+    };
+} payload_rx_ack_ack_t;
+
+// rx ack-nak
+typedef union {
+    boost::uint16_t msg;
+    struct {
+        boost::uint8_t cls_id;
+        boost::uint8_t msg_id;
+    };
+} payload_rx_ack_nak_t;
+
+// tx cfg-prt (uart)
+struct payload_tx_cfg_prt_t
+{
+    boost::uint8_t  port_id;
+    boost::uint8_t  reserved0;
+    boost::uint16_t tx_ready;
+    boost::uint32_t mode;
+    boost::uint32_t baud_rate;
+    boost::uint16_t in_proto_mask;
+    boost::uint16_t out_proto_mask;
+    boost::uint16_t flags;
+    boost::uint16_t reserved5;
+};
+
+// tx cfg-rate
+struct payload_tx_cfg_rate_t
+{
+    boost::uint16_t meas_rate;
+    boost::uint16_t nav_rate;
+    boost::uint16_t time_ref;
+};
+
+// tx cfg-msg
+struct payload_tx_cfg_msg_t
+{
+    boost::uint16_t msg;
+    boost::uint8_t rate[6];
+};
+
+
+// tx cfg-ant
+struct payload_tx_cfg_ant_t
+{
+    boost::uint16_t flags;
+    boost::uint16_t pins;
+};
+
+// tx cfg-tp
+struct payload_tx_cfg_tp_t
+{
+    boost::uint32_t interval;
+    boost::uint32_t length;
+    boost::int8_t status;
+    boost::uint8_t time_ref;
+    boost::uint8_t flags;
+    boost::uint8_t reserved1;
+    boost::int16_t antenna_delay;
+    boost::int16_t rf_group_delay;
+    boost::int32_t user_delay;
+};
+
+struct payload_rx_nav_sol_t
+{
+    boost::uint32_t i_tow;
+    boost::int32_t f_tow;
+    boost::int16_t week;
+    boost::uint8_t gps_fix;
+    boost::uint8_t flags;
+    boost::int32_t ecef_x;
+    boost::int32_t ecef_y;
+    boost::int32_t ecef_z;
+    boost::uint32_t p_acc;
+    boost::int32_t ecef_vx;
+    boost::int32_t ecef_vy;
+    boost::int32_t ecef_vz;
+    boost::uint32_t s_acc;
+    boost::uint16_t p_dop;
+    boost::uint8_t reserved1;
+    boost::uint8_t num_sv;
+    boost::uint32_t reserved2;
+};
+
+struct payload_rx_nav_timeutc_t
+{
+    boost::uint32_t i_tow;
+    boost::uint32_t t_acc;
+    boost::int32_t nano;
+    boost::uint16_t year;
+    boost::uint8_t month;
+    boost::uint8_t day;
+    boost::uint8_t hour;
+    boost::uint8_t min;
+    boost::uint8_t sec;
+    boost::uint8_t valid;
+};
+
+typedef union {
+    payload_rx_mon_hw_t        payload_rx_mon_hw;
+
+    payload_rx_mon_ver_part1_t payload_rx_mon_ver_part1;
+    payload_rx_mon_ver_part2_t payload_rx_mon_ver_part2;
+
+    payload_rx_ack_ack_t       payload_rx_ack_ack;
+    payload_rx_ack_nak_t       payload_rx_ack_nak;
+
+    payload_tx_cfg_prt_t       payload_tx_cfg_prt;
+    payload_tx_cfg_ant_t       payload_tx_cfg_ant;
+    payload_tx_cfg_rate_t      payload_tx_cfg_rate;
+
+    payload_tx_cfg_msg_t       payload_tx_cfg_msg;
+
+    payload_rx_nav_timeutc_t   payload_rx_nav_timeutc;
+    payload_rx_nav_sol_t   payload_rx_nav_sol;
+    boost::uint8_t             raw[];
+} buf_t;
+
+
+template <typename T>
+class sensor_entry
+{
+public:
+    sensor_entry() : _seen(false)
+    {
+    }
+
+    void update(const T &val)
+    {
+        boost::mutex::scoped_lock l(_mutex);
+        _value = val;
+        _seen = false;
+        l.unlock();
+        _cond.notify_one();
+    }
+
+    bool seen() const
+    {
+        boost::mutex::scoped_lock l(_mutex);
+        return _seen;
+    }
+
+    bool try_and_see(T &val)
+    {
+        boost::mutex::scoped_lock l(_mutex);
+        if (_seen)
+            return false;
+
+        val = _value;
+        _seen = true;
+        return true;
+    }
+
+    void wait_and_see(T &val)
+    {
+        boost::mutex::scoped_lock l(_mutex);
+        while(_seen)
+        {
+            _cond.wait(l);
+            //std::cout << "Already seen ... " << std::endl;
+        }
+        val = _value;
+        _seen = true;
+    }
+
+private: // members
+    T                         _value;
+    boost::mutex              _mutex;
+    boost::condition_variable _cond;
+    bool                _seen;
+};
+
+class control_impl : public control
+{
+public:
+    control_impl(const std::string &node, const size_t baud_rate);
+
+    virtual ~control_impl(void);
+
+    void configure_message_rate(
+        const boost::uint16_t msg,
+        const boost::uint8_t rate);
+
+    void configure_antenna(
+        const boost::uint16_t flags,
+        const boost::uint16_t pins);
+
+    void configure_pps(
+        const boost::uint32_t interval,
+        const boost::uint32_t length,
+        const boost::int8_t status,
+        const boost::uint8_t time_ref,
+        const boost::uint8_t flags,
+        const boost::int16_t antenna_delay,
+        const boost::int16_t rf_group_delay,
+        const boost::int32_t user_delay);
+
+    void configure_rates(
+        boost::uint16_t meas_rate,
+        boost::uint16_t nav_rate,
+        boost::uint16_t time_ref);
+
+    // gps_ctrl interface
+    bool gps_detected(void);
+    std::vector<std::string> get_sensors(void);
+    uhd::sensor_value_t get_sensor(std::string key);
+
+private: // types
+    enum decoder_state_t {
+        DECODE_SYNC1 = 0,
+        DECODE_SYNC2,
+        DECODE_CLASS,
+        DECODE_ID,
+        DECODE_LENGTH1,
+        DECODE_LENGTH2,
+        DECODE_PAYLOAD,
+        DECODE_CHKSUM1,
+        DECODE_CHKSUM2,
+    };
+
+    enum rxmsg_state_t {
+        RXMSG_IGNORE = 0,
+        RXMSG_HANDLE,
+        RXMSG_DISABLE,
+        RXMSG_ERROR_LENGTH
+    };
+
+    enum ack_state_t {
+        ACK_IDLE = 0,
+        ACK_WAITING,
+        ACK_GOT_ACK,
+        ACK_GOT_NAK
+    };
+
+private: // methods
+    std::time_t _get_epoch_time(void);
+
+    void _decode_init(void);
+
+    void _add_byte_to_checksum(const boost::uint8_t b);
+
+    void _detect(void);
+
+    void _send_message(
+        const boost::uint16_t msg,
+        const boost::uint8_t *payload,
+        const boost::uint16_t len);
+
+    int _wait_for_ack(
+        const boost::uint16_t msg,
+        const double timeout);
+
+    void _calc_checksum(
+        const boost::uint8_t *buffer,
+        const boost::uint16_t length,
+        checksum_t &checksum);
+
+    void _rx_callback(const char *data, unsigned len);
+
+    void _parse_char(const boost::uint8_t b);
+
+    int _payload_rx_init(void);
+
+    int _payload_rx_add(const boost::uint8_t b);
+
+    int _payload_rx_done(void);
+
+private: // members
+    // gps_ctrl stuff
+    bool                                   _detected;
+    std::vector<std::string>               _sensors;
+
+    sensor_entry<bool>                     _locked;
+    sensor_entry<boost::posix_time::ptime> _ptime;
+
+    // decoder state
+    decoder_state_t                        _decode_state;
+    rxmsg_state_t                          _rxmsg_state;
+
+    ack_state_t                            _ack_state;
+    boost::uint16_t                        _ack_waiting_msg;
+
+    boost::uint8_t                         _rx_ck_a;
+    boost::uint8_t                         _rx_ck_b;
+
+    boost::uint16_t                        _rx_payload_length;
+    size_t                                 _rx_payload_index;
+    boost::uint16_t                        _rx_msg;
+
+    rxmsg_state_t                          _rx_state;
+
+    boost::shared_ptr<async_serial>        _serial;
+
+    // this has to be at the end of the
+    // class to be valid C++
+    buf_t                                  _buf;
+};
+
+}} // namespace ublox::ubx
+
+}}} // namespace
+#endif // INCLUDED_UHD_USRP_UBLOX_CONTROL_IMPL_HPP
diff --git a/host/utils/CMakeLists.txt b/host/utils/CMakeLists.txt
index 11bb2488a..f693ee7a6 100644
--- a/host/utils/CMakeLists.txt
+++ b/host/utils/CMakeLists.txt
@@ -35,6 +35,13 @@ SET(x3xx_burner_sources
     cdecode.c
 )
 
+find_package(UDev)
+IF(ENABLE_E300)
+    IF(UDEV_FOUND)
+        LIST(APPEND util_runtime_sources usrp_e3x0_network_mode.cpp)
+    ENDIF(UDEV_FOUND)
+ENDIF(ENABLE_E300)
+
 #for each source: build an executable and install
 FOREACH(util_source ${util_runtime_sources})
     GET_FILENAME_COMPONENT(util_name ${util_source} NAME_WE)
diff --git a/host/utils/query_gpsdo_sensors.cpp b/host/utils/query_gpsdo_sensors.cpp
index 9a1556650..05f918eb4 100644
--- a/host/utils/query_gpsdo_sensors.cpp
+++ b/host/utils/query_gpsdo_sensors.cpp
@@ -107,15 +107,20 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
   const time_t pc_clock_time = time(NULL);
   const uhd::time_spec_t last_pps_time = usrp->get_time_last_pps();
   if (last_pps_time.to_ticks(1.0) == gps_time.to_int()) {
-    std::cout << boost::format("GPS and UHD Device time are aligned.\n");
-  } else
-    std::cout << boost::format("\nGPS and UHD Device time are NOT aligned. Try re-running the program. Double check 1 PPS connection from GPSDO.\n\n");
-    
+      std::cout << boost::format("GPS and UHD Device time are aligned.\n");
+  } else {
+      std::cout << boost::format("\nGPS and UHD Device time are NOT aligned last_pps: %ld vs gps: %ld. Try re-running the program. Double check 1 PPS connection from GPSDO.\n\n") % last_pps_time.to_ticks(1.0) % gps_time.to_int() << std::endl;
+  }
+
   //print NMEA strings
-  std::cout << boost::format("Printing available NMEA strings:\n");
-  uhd::sensor_value_t gga_string = usrp->get_mboard_sensor("gps_gpgga");
-  uhd::sensor_value_t rmc_string = usrp->get_mboard_sensor("gps_gprmc");
-  std::cout << boost::format("%s\n%s\n%s\n") % gga_string.to_pp_string() % rmc_string.to_pp_string() % gps_time.to_pp_string();
+  try {
+      uhd::sensor_value_t gga_string = usrp->get_mboard_sensor("gps_gpgga");
+      uhd::sensor_value_t rmc_string = usrp->get_mboard_sensor("gps_gprmc");
+      std::cout << boost::format("Printing available NMEA strings:\n");
+      std::cout << boost::format("%s\n%s\n%s\n") % gga_string.to_pp_string() % rmc_string.to_pp_string() % gps_time.to_pp_string();
+  } catch (std::exception &e) {
+      std::cout << "NMEA strings not implemented for this device." << std::endl;
+  }
   std::cout << boost::format("UHD Device time: %.0f seconds\n") % (last_pps_time.get_real_secs());
   std::cout << boost::format("PC Clock time: %.0f seconds\n") % pc_clock_time;
 
diff --git a/host/utils/usrp_e3x0_network_mode.cpp b/host/utils/usrp_e3x0_network_mode.cpp
new file mode 100644
index 000000000..dae4b6ff7
--- /dev/null
+++ b/host/utils/usrp_e3x0_network_mode.cpp
@@ -0,0 +1,80 @@
+//
+// Copyright 2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include "../lib/usrp/e300/e300_network.hpp"
+#include <uhd/device.hpp>
+#include <uhd/exception.hpp>
+
+#include <uhd/utils/msg.hpp>
+#include <uhd/transport/if_addrs.hpp>
+
+#include <boost/program_options.hpp>
+#include <boost/format.hpp>
+#include <boost/asio.hpp>
+
+#include <iostream>
+
+namespace po = boost::program_options;
+
+static void check_network_ok(void)
+{
+    using namespace uhd::transport;
+    using namespace boost::asio::ip;
+    std::vector<if_addrs_t> addrs = get_if_addrs();
+
+    if(addrs.size() == 1 and addrs.at(0).inet == address_v4::loopback().to_string())
+        throw uhd::runtime_error(
+            "No network address except for loopback found.\n"
+            "Make sure your DHCP server is working or configure a static IP");
+}
+
+int main(int argc, char *argv[])
+{
+    po::options_description desc("Allowed options");
+    desc.add_options()
+        ("help", "help message")
+        ("fpga", po::value<std::string>(), "fpga image to load")
+    ;
+
+    po::variables_map vm;
+    po::store(po::parse_command_line(argc, argv, desc), vm);
+    po::notify(vm);
+
+    //print the help message
+    if (vm.count("help")){
+        std::cout << boost::format("UHD E3x0 Network Mode %s") % desc << std::endl;
+        return EXIT_FAILURE;
+    }
+    uhd::device_addr_t args;
+    if(vm.count("fpga")) {
+        args["fpga"] = vm["fpga"].as<std::string>();
+    }
+
+    try {
+        check_network_ok();
+        uhd::usrp::e300::network_server::sptr server = uhd::usrp::e300::network_server::make(args);
+        server->run();
+    } catch (uhd::assertion_error &e) {
+        UHD_MSG(error) << "This executable is supposed to run on the device, not on the host." << std::endl
+                       << "Please refer to the manual section on operating your e3x0 device in network mode." << std::endl;
+        return EXIT_FAILURE;
+    } catch (uhd::runtime_error &e) {
+        UHD_MSG(error) << e.what() << std::endl;
+        return EXIT_FAILURE;
+    }
+    return EXIT_SUCCESS;
+}