AP_HAL_ChibiOS: add app start offset to leave space for params

libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef-bl.dat

@@ -4,7 +4,10 @@
 MCU STM32F103 STM32F103xB
 
 FLASH_RESERVE_START_KB 0
-FLASH_BOOTLOADER_LOAD_KB 25
+FLASH_BOOTLOADER_LOAD_KB 23
+
+# reserve some space for params
+APP_START_OFFSET_KB 2
 
 # board ID for firmware load
 APJ_BOARD_ID 1000

libraries/AP_HAL_ChibiOS/hwdef/f103-periph/hwdef.dat

@@ -3,7 +3,7 @@
 # MCU class and specific type
 MCU STM32F103 STM32F103xB
 
-# bootloader starts firmware at 25k
+# bootloader starts firmware at 23k + 2k (STORAGE_FLASH_PAGES)
 FLASH_RESERVE_START_KB 25
 
 # store parameters in pages 23 and 24

libraries/AP_HAL_ChibiOS/hwdef/f303-periph/hwdef-bl.dat

@@ -4,7 +4,10 @@
 MCU STM32F303 STM32F303xC
 
 FLASH_RESERVE_START_KB 0
-FLASH_BOOTLOADER_LOAD_KB 26
+FLASH_BOOTLOADER_LOAD_KB 22
+
+# reserve some space for params
+APP_START_OFFSET_KB 4
 
 # board ID for firmware load
 APJ_BOARD_ID 1004

libraries/AP_HAL_ChibiOS/hwdef/f303-periph/hwdef.dat

@@ -3,7 +3,7 @@ g# hw definition file for processing by chibios_pins.py
 # MCU class and specific type
 MCU STM32F303 STM32F303xC
 
-# bootloader starts firmware at 26k
+# bootloader starts firmware at 22k + 4k (STORAGE_FLASH)
 FLASH_RESERVE_START_KB 26
 
 # store parameters in pages 11 and 12

libraries/AP_HAL_ChibiOS/hwdef/scripts/chibios_hwdef.py

@@ -689,6 +689,8 @@ def write_mcu_config(f):
     if args.bootloader:
         f.write('#define FLASH_BOOTLOADER_LOAD_KB %u\n' % get_config('FLASH_BOOTLOADER_LOAD_KB', type=int))
         f.write('#define FLASH_RESERVE_END_KB %u\n' % get_config('FLASH_RESERVE_END_KB', default=0, type=int))
+        f.write('#define APP_START_OFFSET_KB %u\n' % get_config('APP_START_OFFSET_KB', default=0, type=int))
+
     f.write('\n')
 
     ram_map = get_mcu_config('RAM_MAP', True)