diff --git a/ports/nrf/boards/memory.ld b/ports/nrf/boards/memory.ld
index f1f9a2a4c4..9c4c9c8bd1 100644
--- a/ports/nrf/boards/memory.ld
+++ b/ports/nrf/boards/memory.ld
@@ -1,18 +1,20 @@
 
-/* Flash layout: softdevice     | application     | filesystem */
-/* RAM layout:   softdevice RAM | application RAM */
-
-_ram_start     = DEFINED(_ram_start) ? _ram_start : 0x20000000;
-_flash_start   = DEFINED(_flash_start) ? _flash_start : 0;
-_sd_size       = DEFINED(_sd_size) ? _sd_size : _flash_start;
+/* Flash layout: bootloader_head | softdevice     | application     | filesystem    | bootloader_tail */
+/* RAM layout:   bootloader RAM  | softdevice RAM  | application RAM */
+_bootloader_head_size = DEFINED(_bootloader_head_size) ? _bootloader_head_size : 0;
+_bootloader_tail_size = DEFINED(_bootloader_tail_size) ? _bootloader_tail_size : 0;
+_bootloader_head_ram_size = DEFINED(_bootloader_head_ram_size) ? _bootloader_head_ram_size : 0;
+_head_size     = DEFINED(_sd_size) ? _sd_size : _bootloader_head_size;
+_head_ram      = DEFINED(_sd_ram)  ? _sd_ram : _bootloader_head_ram_size;
+_sd_size       = DEFINED(_sd_size) ? _sd_size : 0;
 _sd_ram        = DEFINED(_sd_ram)  ? _sd_ram : 0;
 _fs_size       = DEFINED(_fs_size) ? _fs_size : 64K; /* TODO: set to 0 if not using the filesystem */
-_app_size      = _flash_size - _sd_size - _fs_size;
-_app_start     = _sd_size;
-_fs_start      = _sd_size + _app_size;
+_app_size      = _flash_size - _head_size - _fs_size  - _bootloader_tail_size;
+_app_start     = _head_size;
+_fs_start      = _head_size + _app_size;
 _fs_end        = _fs_start + _fs_size;
-_app_ram_start = _ram_start + _sd_ram;
-_app_ram_size  = _ram_size - _sd_ram;
+_app_ram_start = 0x20000000 + _head_ram;
+_app_ram_size  = _ram_size - _head_ram;
 _heap_start    = _ebss;
 _heap_end      = _ram_end - _stack_size;
 _heap_size     = _heap_end - _heap_start;