make bootloader optional

firmware/Makefile

@@ -9,6 +9,9 @@ endif
 
 BOARDDIR = boards/$(BOARD)
 
+# optionally include board.mk that sets per-board options
+-include $(BOARDDIR)/board.mk
+
 # Compiler options here.
 ifeq ($(USE_OPT),)
   USE_OPT = -O2 -ggdb -fomit-frame-pointer -falign-functions=16 -fsingle-precision-constant
@@ -50,6 +53,10 @@ ifeq ($(USE_SMART_BUILD),)
   USE_SMART_BUILD = yes
 endif
 
+ifeq ($(USE_BOOTLOADER),)
+  USE_BOOTLOADER = no
+endif
+
 #
 # Build global options
 ##############################################################################
@@ -177,8 +184,10 @@ UINCDIR =
 # List the user directory to look for the libraries here
 ULIBDIR = $(BOARDDIR)
 
-# List all user libraries here
-ULIBS = boards/f0_module/bootloader/build/wideband_bootloader.o
+ifeq ($(USE_BOOTLOADER),yes)
+  ULIBS = boards/f0_module/bootloader/build/wideband_bootloader.o
+  USE_OPT += -Wl,--defsym=USE_BOOTLOADER=1
+endif
 
 #
 # End of user section

firmware/boards/f0_module/board.mk

@@ -0,0 +1 @@
+USE_BOOTLOADER = yes

firmware/boards/f0_module/bootloader/Makefile

@@ -159,6 +159,7 @@ ULIBDIR =
 # List all user libraries here
 # Add the search path of the firmware/ dir, we need wideband_layout.ld
 ULIBS = -L..
+USE_OPT += -Wl,--defsym=USE_BOOTLOADER=1
 
 #
 # End of user section

firmware/boards/f0_module/wideband_layout.ld

@@ -2,7 +2,7 @@
  * STM32F042x6 memory setup.
  */
 
-blsize = 6k;
+blsize = DEFINED(USE_BOOTLOADER) ? 6k : 0;
 
 MEMORY
 {