nrf: mpconfigport: subtract config size from firmware size

The BLE Config area needs to be subtracted from the size of the firmware.
THis is because the firmware is counted by walking backwards from the end
of memory, and the BLE config area is placed lower in memory than the
firmware.  Subtracting the BLE config size ensures the internal flash
filesystem doesn't try to use the firmware as storage.

Signed-off-by: Sean Cross <[email protected]>

Author: xobs

ports/nrf/mpconfigport.h

@@ -141,7 +141,7 @@
 #define CIRCUITPY_BLE_CONFIG_START_ADDR (CIRCUITPY_INTERNAL_NVM_START_ADDR - CIRCUITPY_BLE_CONFIG_SIZE)
 
 // The firmware space is the space left over between the fixed lower and upper regions.
-#define CIRCUITPY_FIRMWARE_SIZE (CIRCUITPY_INTERNAL_FLASH_FILESYSTEM_START_ADDR - CIRCUITPY_FIRMWARE_START_ADDR)
+#define CIRCUITPY_FIRMWARE_SIZE (CIRCUITPY_INTERNAL_FLASH_FILESYSTEM_START_ADDR - CIRCUITPY_FIRMWARE_START_ADDR - CIRCUITPY_BLE_CONFIG_SIZE)
 
 #if BOOTLOADER_START_ADDR % FLASH_ERASE_SIZE != 0
 #error BOOTLOADER_START_ADDR must be on a flash erase boundary.