AP_HAL_ChibiOS: Copy vector table to RAM if external flash is primary

libraries/AP_HAL_ChibiOS/hwdef/common/chibios_board.mk

@@ -264,6 +264,10 @@ endif
 # Define ASM defines here
 UADEFS =
 
+ifeq ($(COPY_VECTORS_TO_RAM),yes)
+ UADEFS += -DCRT0_INIT_VECTORS=1
+endif
+
 # List all user directories here
 UINCDIR =
 

libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py

@@ -1363,6 +1363,7 @@ INCLUDE common_mixf.ld
 ''' % (flash_base, flash_length, ext_flash_base, ext_flash_length, ram0_start, ram0_len))
         else:
             self.env_vars['HAS_EXTERNAL_FLASH_SECTIONS'] = 1
+            self.build_flags.append('COPY_VECTORS_TO_RAM=yes')
             f.write('''/* generated ldscript.ld */
 MEMORY
 {