Merge branch 'master' into next

8 files changed, 169 insertions, 126 deletions

diff --git a/fpga/usrp2/fifo/fifo_2clock.v b/fpga/usrp2/fifo/fifo_2clock.v
index 756ad508f..98aab18a5 100644
--- a/fpga/usrp2/fifo/fifo_2clock.v
+++ b/fpga/usrp2/fifo/fifo_2clock.v
@@ -1,5 +1,5 @@
 //
-// Copyright 2011 Ettus Research LLC
+// Copyright 2011-2012 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
@@ -31,42 +31,44 @@ module fifo_2clock
    assign src_rdy_o  = ~empty;
    assign write      = src_rdy_i & dst_rdy_o;
    assign read 	     = src_rdy_o & dst_rdy_i;
-   wire 	 dummy;
-   
+
    generate
-      if(WIDTH==36)
+      if((WIDTH <= 36) && (WIDTH > 19)) begin
+	wire [35:0] data_in_wide, data_out_wide;
+	assign data_in_wide[WIDTH-1:0] = datain;
+	assign dataout = data_out_wide[WIDTH-1:0];
 	if(SIZE==9)
 	  fifo_xlnx_512x36_2clk fifo_xlnx_512x36_2clk
 	       (.rst(arst),
-		.wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-		.rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
+		.wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
+		.rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
 	else if(SIZE==11)
 	  fifo_xlnx_2Kx36_2clk fifo_xlnx_2Kx36_2clk 
 		     (.rst(arst),
-		      .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-		      .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
+		      .wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
+		      .rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
 	else if(SIZE==6)
 	  fifo_xlnx_64x36_2clk fifo_xlnx_64x36_2clk 
 		     (.rst(arst),
-		      .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-		      .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
+		      .wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
+		      .rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
 	else
 	  fifo_xlnx_512x36_2clk fifo_xlnx_512x36_2clk
 	       (.rst(arst),
-		.wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-		.rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
-      else if((WIDTH==19) & (SIZE==4))
-	fifo_xlnx_16x19_2clk fifo_xlnx_16x19_2clk
-	  (.rst(arst),
-	   .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-	   .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
-      else if((WIDTH==18) & (SIZE==4))
+		.wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
+		.rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
+      end
+      else if((WIDTH <= 19) && (SIZE <= 4)) begin
+	wire [18:0] data_in_wide, data_out_wide;
+	assign data_in_wide[WIDTH-1:0] = datain;
+	assign dataout = data_out_wide[WIDTH-1:0];
 	fifo_xlnx_16x19_2clk fifo_xlnx_16x19_2clk
 	  (.rst(arst),
-	   .wr_clk(wclk),.din({1'b0,datain}),.full(full),.wr_en(write),.wr_data_count(level_wclk),
-	   .rd_clk(rclk),.dout({dummy,dataout}),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
+	   .wr_clk(wclk),.din(data_in_wide),.full(full),.wr_en(write),.wr_data_count(level_wclk),
+	   .rd_clk(rclk),.dout(data_out_wide),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) );
+      end
    endgenerate
-   
+
    assign occupied  = {{(16-SIZE-1){1'b0}},level_rclk};
    assign space     = ((1<<SIZE)+1)-level_wclk;
    
diff --git a/fpga/usrp2/gpif/packet_reframer.v b/fpga/usrp2/gpif/packet_reframer.v
index 8bb8a3678..e0ce9e174 100644
--- a/fpga/usrp2/gpif/packet_reframer.v
+++ b/fpga/usrp2/gpif/packet_reframer.v
@@ -20,7 +20,7 @@
 
 module packet_reframer
   (input clk, input reset, input clear,
-   input [18:0] data_i,
+   input [15:0] data_i,
    input src_rdy_i,
    output dst_rdy_o,
    output [18:0] data_o,
@@ -60,8 +60,7 @@ module packet_reframer
    wire occ_out = 0;
    assign eof_out = (state == RF_PKT) & (length == 2);
    wire sof_out = (state == RF_IDLE);
-   wire [15:0] data_out = data_i[15:0];
-   assign data_o = {occ_out, eof_out, sof_out, data_out};
+   assign data_o = {occ_out, eof_out, sof_out, data_i[15:0]};
    
       
 endmodule // packet_reframer
diff --git a/fpga/usrp2/gpif/slave_fifo.v b/fpga/usrp2/gpif/slave_fifo.v
index 10740942b..b1d642fca 100644
--- a/fpga/usrp2/gpif/slave_fifo.v
+++ b/fpga/usrp2/gpif/slave_fifo.v
@@ -46,11 +46,15 @@ module slave_fifo
     output [31:0] debug0, output [31:0] debug1
     );
 
+    reg FX2_DE, FX2_CE, FX2_DF, FX2_CF;
+
    // inputs to FPGA (all active low)
-   wire       FX2_DE = ~gpif_ctl[0]; //EP2 FX2 FIFO empty (FLAGA)
-   wire       FX2_CE = ~gpif_ctl[1]; //EP4 FX2 FIFO empty (FLAGB)
-   wire       FX2_DF = ~gpif_ctl[2]; //EP6 FX2 FIFO full  (FLAGC)
-   wire       FX2_CF = ~gpif_ctl[3]; //EP8 FX2 FIFO full  (FLAGD)
+    always @(posedge gpif_clk) begin
+        FX2_DE <= ~gpif_ctl[0]; //EP2 FX2 FIFO empty (FLAGA)
+        FX2_CE <= ~gpif_ctl[1]; //EP4 FX2 FIFO empty (FLAGB)
+        FX2_DF <= ~gpif_ctl[2]; //EP6 FX2 FIFO full  (FLAGC)
+        FX2_CF <= ~gpif_ctl[3]; //EP8 FX2 FIFO full  (FLAGD)
+    end
 
    wire [17:0] 	  gpif_d_out_ctrl, gpif_d_out_data, gpif_d_out;
 
@@ -68,7 +72,7 @@ module slave_fifo
    //tx
    wire ctrl_tx_dst_rdy; //sm input, ctrl tx path has space
    wire ctrl_tx_src_rdy; //sm output, ctrl tx path enable
-   reg data_tx_dst_rdy; //sm input, data tx path has space
+   wire data_tx_dst_rdy; //sm input, data tx path has space
    wire data_tx_src_rdy; //sm output, data tx path enable
 
    //rx
@@ -77,9 +81,9 @@ module slave_fifo
    wire data_rx_dst_rdy; //sm output, data rx path enable
    wire data_rx_src_rdy; //sm input, data rx path has space
 
-   reg [9:0] transfer_count; //number of lines (a line is 16 bits) in active transfer
+   reg tx_data_enough_space;
 
-   wire       sop, eop; //SOP/EOP markers for TX data packets
+   reg [9:0] transfer_count; //number of lines (a line is 16 bits) in active transfer
    
    reg pktend_latch;
 
@@ -93,6 +97,7 @@ module slave_fifo
    localparam STATE_CTRL_TX_SLOE = 8;
    localparam STATE_DATA_RX_ADR = 1;
    localparam STATE_CTRL_RX_ADR = 4;
+   localparam STATE_PKTEND_ADR = 10;
    localparam STATE_PKTEND = 7;
 
    //logs the last bus user for xfer fairness
@@ -118,16 +123,16 @@ module slave_fifo
              state <= STATE_CTRL_TX_SLOE;
            else if(ctrl_rx_src_rdy & ~FX2_CF) //if the ctrl fifo has data and the FX2 isn't full
              state <= STATE_CTRL_RX_ADR;
-           else if(data_tx_dst_rdy & ~FX2_DE & last_data_bus_hog == BUS_HOG_RX) //if there's room in the data fifo and the FX2 has data
+           else if(data_tx_dst_rdy & ~FX2_DE & last_data_bus_hog == BUS_HOG_RX & tx_data_enough_space) //if there's room in the data fifo and the FX2 has data
              state <= STATE_DATA_TX_SLOE;
            else if(data_rx_src_rdy & ~FX2_DF & last_data_bus_hog == BUS_HOG_TX) //if the data fifo has data and the FX2 isn't full
              state <= STATE_DATA_RX_ADR;
-           else if(data_tx_dst_rdy & ~FX2_DE)
+           else if(data_tx_dst_rdy & ~FX2_DE & tx_data_enough_space)
              state <= STATE_DATA_TX_SLOE;
            else if(data_rx_src_rdy & ~FX2_DF)
              state <= STATE_DATA_RX_ADR;
            else if(~data_rx_src_rdy & ~dsp_rx_run & pktend_latch & ~FX2_DF)
-             state <= STATE_PKTEND;
+             state <= STATE_PKTEND_ADR;
              
            if(data_rx_src_rdy)
              pktend_latch <= 1;
@@ -145,13 +150,18 @@ module slave_fifo
 
          STATE_DATA_RX:
             begin
-           if((transfer_count == data_transfer_size) | FX2_DF | (~data_rx_src_rdy))
-             state <= STATE_IDLE;
-
-           transfer_count <= transfer_count + 1;
-           last_data_bus_hog <= BUS_HOG_RX;
+                if(data_rx_src_rdy && data_rx_dst_rdy && (transfer_count != data_transfer_size))
+                    transfer_count <= transfer_count + 1;
+                else
+                    state <= STATE_IDLE;
+                last_data_bus_hog <= BUS_HOG_RX;
             end
             
+         STATE_PKTEND_ADR:
+            begin
+           state <= STATE_PKTEND;
+            end
+
          STATE_PKTEND:
             begin
            state <= STATE_IDLE;
@@ -160,22 +170,25 @@ module slave_fifo
             
          STATE_DATA_TX:
             begin
-           if((transfer_count == data_transfer_size) | FX2_DE )/*| (~data_tx_dst_rdy))*/
-             state <= STATE_IDLE;
-           transfer_count <= transfer_count + 1;
-           last_data_bus_hog <= BUS_HOG_TX;
+                if(data_tx_dst_rdy && data_tx_src_rdy && (transfer_count != data_transfer_size))
+                    transfer_count <= transfer_count + 1;
+                else
+                    state <= STATE_IDLE;
+                last_data_bus_hog <= BUS_HOG_TX;
             end
          STATE_CTRL_RX:
             begin
-           if(FX2_CF | (~ctrl_rx_src_rdy))
-             state <= STATE_IDLE;
-           transfer_count <= transfer_count + 1;
+                if(ctrl_rx_src_rdy && ctrl_rx_dst_rdy)
+                    transfer_count <= transfer_count + 1;
+                else
+                    state <= STATE_IDLE;
             end
          STATE_CTRL_TX:
             begin
-           if(FX2_CE | (~ctrl_tx_dst_rdy))
-             state <= STATE_IDLE;
-           transfer_count <= transfer_count + 1;
+                if(ctrl_tx_dst_rdy && ctrl_tx_src_rdy)
+                    transfer_count <= transfer_count + 1;
+                else
+                    state <= STATE_IDLE;
             end
        endcase
         end
@@ -184,18 +197,15 @@ module slave_fifo
    // fifo signal assignments and enables
 
    //enable fifos
-   assign data_rx_dst_rdy = (state == STATE_DATA_RX);
-   assign data_tx_src_rdy = (state == STATE_DATA_TX);
-   assign ctrl_rx_dst_rdy = (state == STATE_CTRL_RX);
-   assign ctrl_tx_src_rdy = (state == STATE_CTRL_TX);
-
-   //tx framing (this is super suspect)
-   //eop should be used only to set the EOP bit going into FIFOs
-   wire eop_data, eop_ctrl;
-   assign sop = (transfer_count == 0);
-   assign eop_data = (transfer_count == (data_transfer_size-1));
+   assign data_rx_dst_rdy = (state == STATE_DATA_RX) && ~FX2_DF;
+   assign data_tx_src_rdy = (state == STATE_DATA_TX) && ~FX2_DE;
+   assign ctrl_rx_dst_rdy = (state == STATE_CTRL_RX) && ~FX2_CF;
+   assign ctrl_tx_src_rdy = (state == STATE_CTRL_TX) && ~FX2_CE;
+
+   //framing for TX ctrl packets
+   wire sop_ctrl, eop_ctrl;
+   assign sop_ctrl = (transfer_count == 0);
    assign eop_ctrl = (transfer_count == (ctrl_transfer_size-1));
-   assign eop = (state == STATE_DATA_TX) ? eop_data : eop_ctrl;
 
    // ////////////////////////////////////////////////////////////////////
    // set GPIF pins
@@ -205,15 +215,15 @@ module slave_fifo
    // {0,1}: EP4, ctrl TX from host
    // {1,0}: EP6, data RX to host
    // {1,1}: EP8, ctrl RX to host
-   assign fifoadr = {(state == STATE_DATA_RX) | (state == STATE_CTRL_RX) | (state == STATE_DATA_RX_ADR) | (state == STATE_CTRL_RX_ADR) | (state == STATE_PKTEND),
+   assign fifoadr = {(state == STATE_DATA_RX) | (state == STATE_CTRL_RX) | (state == STATE_DATA_RX_ADR) | (state == STATE_CTRL_RX_ADR) | (state == STATE_PKTEND) | (state == STATE_PKTEND_ADR),
                      (state == STATE_CTRL_RX) | (state == STATE_CTRL_RX_ADR) | (state == STATE_CTRL_TX) | (state == STATE_CTRL_TX_SLOE)};
    //set sloe, slwr, slrd (all active low)
    //SLOE gets asserted when we want data from the FX2; i.e., TX mode
    assign sloe = ~{(state == STATE_DATA_TX) | (state == STATE_CTRL_TX) | (state == STATE_DATA_TX_SLOE) | (state == STATE_CTRL_TX_SLOE)};
    //"read" and "write" here are from the master's point of view;
    //so "read" means "transmit" and "write" means "receive"
-   assign slwr = ~{(state == STATE_DATA_RX) | (state == STATE_CTRL_RX)};
-   assign slrd = ~{(state == STATE_DATA_TX) | (state == STATE_CTRL_TX)};
+   assign slwr = ~{(data_rx_src_rdy && data_rx_dst_rdy) || (ctrl_rx_src_rdy && ctrl_rx_dst_rdy)};
+   assign slrd = ~{(data_tx_src_rdy && data_tx_dst_rdy) || (ctrl_tx_src_rdy && ctrl_tx_dst_rdy)};
 
    wire pktend_ctrl, pktend_data;
    assign pktend_ctrl = ((~ctrl_rx_src_rdy | gpif_d_out_ctrl[17]) & (state == STATE_CTRL_RX));
@@ -228,43 +238,39 @@ module slave_fifo
    // ////////////////////////////////////////////////////////////////////
    // TX Data Path
 
-   wire [18:0] 	  tx19_data;
-   wire 	  tx19_src_rdy, tx19_dst_rdy;
+   wire [15:0] 	  txfifo_data;
+   wire 	  txfifo_src_rdy, txfifo_dst_rdy;
    wire [35:0] 	  tx36_data;
    wire 	  tx36_src_rdy, tx36_dst_rdy;
-   wire [17:0]    data_tx_int;
-   wire           tx_src_rdy_int, tx_dst_rdy_int;
+   wire [15:0]    data_tx_2clk;
+   wire           tx_src_rdy_2clk, tx_dst_rdy_2clk;
    
    wire [15:0] wr_fifo_space;
-   
+
    always @(posedge gpif_clk)
-     if(gpif_rst)
-       data_tx_dst_rdy <= 0;
-     else
-       data_tx_dst_rdy <= wr_fifo_space >= 256;
+     tx_data_enough_space <= (wr_fifo_space >= data_transfer_size);
 
-   fifo_cascade #(.WIDTH(18), .SIZE(12)) wr_fifo
+   fifo_cascade #(.WIDTH(16), .SIZE(12)) wr_fifo
      (.clk(gpif_clk), .reset(gpif_rst), .clear(clear_tx),
-      .datain({eop,sop,gpif_d}), .src_rdy_i(data_tx_src_rdy), .dst_rdy_o(/*data_tx_dst_rdy*/), .space(wr_fifo_space),
-      .dataout(data_tx_int), .src_rdy_o(tx_src_rdy_int), .dst_rdy_i(tx_dst_rdy_int), .occupied());
+      .datain(gpif_d), .src_rdy_i(data_tx_src_rdy), .dst_rdy_o(data_tx_dst_rdy), .space(wr_fifo_space),
+      .dataout(txfifo_data), .src_rdy_o(txfifo_src_rdy), .dst_rdy_i(txfifo_dst_rdy), .occupied());
    
-   fifo_2clock_cascade #(.WIDTH(18), .SIZE(4)) wr_fifo_2clk
-     (.wclk(gpif_clk), .datain(data_tx_int), .src_rdy_i(tx_src_rdy_int), .dst_rdy_o(tx_dst_rdy_int), .space(),
-      .rclk(fifo_clk), .dataout(tx19_data[17:0]), .src_rdy_o(tx19_src_rdy), .dst_rdy_i(tx19_dst_rdy), .occupied(),
+   fifo_2clock_cascade #(.WIDTH(16), .SIZE(4)) wr_fifo_2clk
+     (.wclk(gpif_clk), .datain(txfifo_data), .src_rdy_i(txfifo_src_rdy), .dst_rdy_o(txfifo_dst_rdy), .space(),
+      .rclk(fifo_clk), .dataout(data_tx_2clk), .src_rdy_o(tx_src_rdy_2clk), .dst_rdy_i(tx_dst_rdy_2clk), .occupied(),
       .arst(fifo_rst));
-      
-   assign tx19_data[18] = 1'b0;
 
-   // join vita packets which are longer than one frame, drop frame padding
+   // join vita packets which are longer than one frame, add SOP/EOP/OCC
    wire [18:0] 	  refr_data;
    wire 	  refr_src_rdy, refr_dst_rdy;
+   //below 3 signals for debug only
    wire refr_state;
    wire refr_eof;
    wire [15:0] refr_len;
    
    packet_reframer tx_packet_reframer 
      (.clk(fifo_clk), .reset(fifo_rst), .clear(clear_tx),
-      .data_i(tx19_data), .src_rdy_i(tx19_src_rdy), .dst_rdy_o(tx19_dst_rdy),
+      .data_i(data_tx_2clk), .src_rdy_i(tx_src_rdy_2clk), .dst_rdy_o(tx_dst_rdy_2clk),
       .data_o(refr_data), .src_rdy_o(refr_src_rdy), .dst_rdy_i(refr_dst_rdy),
       .state(refr_state), .eof_out(refr_eof), .length(refr_len));
 
@@ -308,7 +314,7 @@ module slave_fifo
       .arst(fifo_rst));
 
    //rd_fifo buffers writes to the 2clock fifo above
-   fifo_cascade #(.WIDTH(19), .SIZE(RXFIFOSIZE)) rd_fifo
+   fifo_cascade #(.WIDTH(16), .SIZE(RXFIFOSIZE)) rd_fifo
      (.clk(~gpif_clk), .reset(gpif_rst), .clear(clear_rx),
       .datain(data_rx_int), .src_rdy_i(rx_src_rdy_int), .dst_rdy_o(rx_dst_rdy_int), .space(rxfifospace),
       .dataout(gpif_d_out_data), .src_rdy_o(data_rx_src_rdy), .dst_rdy_i(data_rx_dst_rdy), .occupied());
@@ -341,7 +347,7 @@ module slave_fifo
    //how does this use fifo_clk instead of wb_clk
    //answer: on b100 fifo clk IS wb clk
    fifo_2clock_cascade #(.WIDTH(19), .SIZE(4)) ctrl_fifo_2clk
-     (.wclk(gpif_clk), .datain({1'b0,eop,sop,gpif_d}), 
+     (.wclk(gpif_clk), .datain({1'b0,eop_ctrl,sop_ctrl,gpif_d}), 
       .src_rdy_i(ctrl_tx_src_rdy), .dst_rdy_o(ctrl_tx_dst_rdy), .space(),
       .rclk(fifo_clk), .dataout(ctrl_data), 
       .src_rdy_o(ctrl_src_rdy), .dst_rdy_i(ctrl_dst_rdy), .occupied(),
diff --git a/fpga/usrp2/top/B100/u1plus_core.v b/fpga/usrp2/top/B100/u1plus_core.v
index e335fb8bb..26714b669 100644
--- a/fpga/usrp2/top/B100/u1plus_core.v
+++ b/fpga/usrp2/top/B100/u1plus_core.v
@@ -413,7 +413,7 @@ module u1plus_core
    // Readback mux 32 -- Slave #7
 
    //compatibility number -> increment when the fpga has been sufficiently altered
-   localparam compat_num = {16'd9, 16'd0}; //major, minor
+   localparam compat_num = {16'd9, 16'd1}; //major, minor
 
    wire [31:0] reg_test32;
 
diff --git a/host/cmake/Modules/UHDVersion.cmake b/host/cmake/Modules/UHDVersion.cmake
index 8f77188ee..b9ddddae3 100644
--- a/host/cmake/Modules/UHDVersion.cmake
+++ b/host/cmake/Modules/UHDVersion.cmake
@@ -32,34 +32,40 @@ SET(UHD_VERSION_PATCH 000)
 ########################################################################
 # Version information discovery through git log
 ########################################################################
-IF(UHD_RELEASE_MODE)
-    SET(UHD_BUILD_INFO_DISCOVERY FALSE)
-    SET(UHD_BUILD_INFO "release")
-ELSE()
-    SET(UHD_BUILD_INFO_DISCOVERY GIT_FOUND)
-    SET(UHD_BUILD_INFO "unknown")
-ENDIF()
 
-IF(UHD_BUILD_INFO_DISCOVERY)
+#grab the git ref id for the current head
+EXECUTE_PROCESS(
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    COMMAND ${GIT_EXECUTABLE} describe --always --abbrev=8 --long
+    OUTPUT_VARIABLE _git_describe OUTPUT_STRIP_TRAILING_WHITESPACE
+    RESULT_VARIABLE _git_describe_result
+)
 
-    #grab the git ref id for the current head
+#only set the build info on success
+IF(_git_describe_result EQUAL 0)
+    EXECUTE_PROCESS(
+        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+        COMMAND ${PYTHON_EXECUTABLE} -c "print '${_git_describe}'.split('-')[1]"
+        OUTPUT_VARIABLE UHD_GIT_COUNT OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
     EXECUTE_PROCESS(
         WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-        COMMAND ${GIT_EXECUTABLE} describe --always --abbrev=8 --long
-        OUTPUT_VARIABLE _git_describe OUTPUT_STRIP_TRAILING_WHITESPACE
-        RESULT_VARIABLE _git_describe_result
+        COMMAND ${PYTHON_EXECUTABLE} -c "print '${_git_describe}'.split('-')[2]"
+        OUTPUT_VARIABLE UHD_GIT_HASH OUTPUT_STRIP_TRAILING_WHITESPACE
     )
+ENDIF()
 
-    #only set the build info on success
-    IF(_git_describe_result EQUAL 0)
-        EXECUTE_PROCESS(
-            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-            COMMAND ${PYTHON_EXECUTABLE} -c "print '${_git_describe}'.split('-',1)[1]"
-            OUTPUT_VARIABLE UHD_BUILD_INFO OUTPUT_STRIP_TRAILING_WHITESPACE
-        )
-    ENDIF()
+IF(NOT UHD_GIT_COUNT)
+    SET(UHD_GIT_COUNT "0")
+ENDIF()
+
+IF(NOT UHD_GIT_HASH)
+    SET(UHD_GIT_HASH "unknown")
+ENDIF()
 
-ENDIF(UHD_BUILD_INFO_DISCOVERY)
+IF(UHD_RELEASE_MODE)
+    SET(UHD_GIT_HASH ${UHD_RELEASE_MODE})
+ENDIF()
 
 ########################################################################
-SET(UHD_VERSION "${UHD_VERSION_MAJOR}.${UHD_VERSION_MINOR}.${UHD_VERSION_PATCH}-${UHD_BUILD_INFO}")
+SET(UHD_VERSION "${UHD_VERSION_MAJOR}.${UHD_VERSION_MINOR}.${UHD_VERSION_PATCH}-${UHD_GIT_COUNT}-${UHD_GIT_HASH}")
diff --git a/host/lib/usrp/common/fx2_ctrl.cpp b/host/lib/usrp/common/fx2_ctrl.cpp
index 7b8920eb1..5cc701eb0 100644
--- a/host/lib/usrp/common/fx2_ctrl.cpp
+++ b/host/lib/usrp/common/fx2_ctrl.cpp
@@ -411,6 +411,26 @@ public:
         return usrp_control_write(request, value, index, 0, 0);
     }
 
+    void write_eeprom(
+        boost::uint8_t addr,
+        boost::uint8_t offset,
+        const byte_vector_t &bytes
+    ){
+        byte_vector_t bytes_with_cmd(bytes.size() + 1);
+        bytes_with_cmd[0] = offset;
+        std::copy(bytes.begin(), bytes.end(), &bytes_with_cmd[1]);
+        this->write_i2c(addr, bytes_with_cmd);
+    }
+
+    byte_vector_t read_eeprom(
+        boost::uint8_t addr,
+        boost::uint8_t offset,
+        size_t num_bytes
+    ){
+        this->write_i2c(addr, byte_vector_t(1, offset));
+        return this->read_i2c(addr, num_bytes);
+    }
+
     int usrp_i2c_write(boost::uint16_t i2c_addr, unsigned char *buf, boost::uint16_t len)
     {
         return usrp_control_write(VRQ_I2C_WRITE, i2c_addr, 0, buf, len);
@@ -428,12 +448,7 @@ public:
     {
         UHD_ASSERT_THROW(bytes.size() < max_i2c_data_bytes);
 
-        unsigned char buff[max_i2c_data_bytes] = {};
-        std::copy(bytes.begin(), bytes.end(), buff);
-
-        int ret = this->usrp_i2c_write(addr & 0xff,
-                                             buff,
-                                             bytes.size());
+        int ret = this->usrp_i2c_write(addr, (unsigned char *)&bytes.front(), bytes.size());
 
         if (iface_debug && (ret < 0))
             uhd::runtime_error("USRP: failed i2c write");
@@ -443,19 +458,13 @@ public:
     {
       UHD_ASSERT_THROW(num_bytes < max_i2c_data_bytes);
 
-      unsigned char buff[max_i2c_data_bytes] = {};
-      int ret = this->usrp_i2c_read(addr & 0xff,
-                                            buff,
-                                            num_bytes);
+      byte_vector_t bytes(num_bytes);
+      int ret = this->usrp_i2c_read(addr, (unsigned char *)&bytes.front(), num_bytes);
 
       if (iface_debug && ((ret < 0) || (unsigned)ret < (num_bytes)))
           uhd::runtime_error("USRP: failed i2c read");
 
-      byte_vector_t out_bytes;
-      for (size_t i = 0; i < num_bytes; i++)
-          out_bytes.push_back(buff[i]);
-
-      return out_bytes;
+      return bytes;
     }
 
 
diff --git a/host/lib/usrp/dboard/db_dbsrx.cpp b/host/lib/usrp/dboard/db_dbsrx.cpp
index 846597f06..95c5c5d4d 100644
--- a/host/lib/usrp/dboard/db_dbsrx.cpp
+++ b/host/lib/usrp/dboard/db_dbsrx.cpp
@@ -1,5 +1,5 @@
 //
-// Copyright 2010-2011 Ettus Research LLC
+// Copyright 2010-2012 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
@@ -58,6 +58,8 @@ static const uhd::dict<std::string, gain_range_t> dbsrx_gain_ranges = map_list_o
     ("GC2", gain_range_t(0, 24, 1))
 ;
 
+static const double usrp1_gpio_clock_rate_limit = 4e6;
+
 /***********************************************************************
  * The DBSRX dboard class
  **********************************************************************/
@@ -265,6 +267,11 @@ double dbsrx::set_lo_freq(double target_freq){
     std::vector<double> clock_rates = this->get_iface()->get_clock_rates(dboard_iface::UNIT_RX);
     const double max_clock_rate = uhd::sorted(clock_rates).back();
     BOOST_FOREACH(ref_clock, uhd::reversed(uhd::sorted(clock_rates))){
+        //USRP1 feeds the DBSRX clock from a FPGA GPIO line.
+        //make sure that this clock does not exceed rate limit.
+        if (this->get_iface()->get_special_props().soft_clock_divider){
+            if (ref_clock > usrp1_gpio_clock_rate_limit) continue;
+        }
         if (ref_clock > 27.0e6) continue;
         if (size_t(max_clock_rate/ref_clock)%2 == 1) continue; //reject asymmetric clocks (odd divisors)
 
diff --git a/host/lib/usrp/usrp2/usrp2_impl.cpp b/host/lib/usrp/usrp2/usrp2_impl.cpp
index 2e3d1e479..55c5e7dac 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.cpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.cpp
@@ -121,12 +121,26 @@ static device_addrs_t usrp2_find(const device_addr_t &hint_){
             //new_addr["addr"] = ip_addr.to_string();
             new_addr["addr"] = udp_transport->get_recv_addr();
 
+            //Attempt a simple 2-way communication with a connected socket.
+            //Reason: Although the USRP will respond the broadcast above,
+            //we may not be able to communicate directly (non-broadcast).
+            udp_simple::sptr ctrl_xport = udp_simple::make_connected(
+                new_addr["addr"], BOOST_STRINGIZE(USRP2_UDP_CTRL_PORT)
+            );
+            ctrl_xport->send(boost::asio::buffer(&ctrl_data_out, sizeof(ctrl_data_out)));
+            size_t len = ctrl_xport->recv(asio::buffer(usrp2_ctrl_data_in_mem));
+            if (len > offsetof(usrp2_ctrl_data_t, data) and ntohl(ctrl_data_in->id) == USRP2_CTRL_ID_WAZZUP_DUDE){
+                //found the device, open up for communication!
+            }
+            else{
+                //otherwise we don't find it...
+                continue;
+            }
+
             //Attempt to read the name from the EEPROM and perform filtering.
             //This operation can throw due to compatibility mismatch.
             try{
-                usrp2_iface::sptr iface = usrp2_iface::make(udp_simple::make_connected(
-                    new_addr["addr"], BOOST_STRINGIZE(USRP2_UDP_CTRL_PORT)
-                ));
+                usrp2_iface::sptr iface = usrp2_iface::make(ctrl_xport);
                 if (iface->is_device_locked()) continue; //ignore locked devices
                 mboard_eeprom_t mb_eeprom = iface->mb_eeprom;
                 new_addr["name"] = mb_eeprom["name"];