e300: added -DE300_FORCE_NETWORK flag to CMake configuration

* Fixes building E300 support in native mode on any Linux system with libudev headers
* Added E300_NATIVE check to e300_common.cpp
* Improved network mode documentation

2 files changed, 18 insertions, 2 deletions

diff --git a/host/lib/usrp/e300/CMakeLists.txt b/host/lib/usrp/e300/CMakeLists.txt
index 26e34294a..ae817c620 100644
--- a/host/lib/usrp/e300/CMakeLists.txt
+++ b/host/lib/usrp/e300/CMakeLists.txt
@@ -42,14 +42,14 @@ IF(ENABLE_E300)
         ${CMAKE_CURRENT_SOURCE_DIR}/e300_remote_codec_ctrl.cpp
     )
     LIBUHD_APPEND_SOURCES(${E300_SOURCES})
-    IF(UDEV_FOUND)
+    IF(UDEV_FOUND AND NOT E300_FORCE_NETWORK)
         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(UDEV_FOUND AND NOT E300_FORCE_NETWORK)
 
     IF(ENABLE_GPSD)
         SET_SOURCE_FILES_PROPERTIES(
diff --git a/host/lib/usrp/e300/e300_common.cpp b/host/lib/usrp/e300/e300_common.cpp
index 29117e21f..216713bc6 100644
--- a/host/lib/usrp/e300/e300_common.cpp
+++ b/host/lib/usrp/e300/e300_common.cpp
@@ -29,6 +29,7 @@
 #include <fstream>
 #include <string>
 
+#ifdef E300_NATIVE
 namespace uhd { namespace usrp { namespace e300 {
 
 namespace common {
@@ -90,3 +91,18 @@ UHD_STATIC_BLOCK(register_e300_image_loader) {
 }
 
 }}}
+
+#else
+namespace uhd { namespace usrp { namespace e300 {
+
+namespace common {
+
+void load_fpga_image(const std::string&)
+{
+    throw uhd::assertion_error("load_fpga_image() !E300_NATIVE");
+}
+
+}
+
+}}}
+#endif