jebbatime
/
micropython
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

nrf: linker scripts: Reserve the first 32 bytes of RAM 

These 32 bytes can be used as pseudo-NVRAM to allow communication between
the payload and the bootloader. The pseudo-NVRAM driver can be written in
pure python (using machine.mem32) so there no code changes beyond reserving
the memory are required.
pull/1/head
Daniel Thompson 2020-05-09 14:13:47 +01:00
parent 5424de70d7
commit 8ea3211068
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
ports/nrf/boards/memory.ld
View File

@ -1,15 +1,17 @@
/* Flash layout: softdevice | application | filesystem */
/* RAM layout: softdevice RAM | application RAM */
_sd_size = DEFINED(_sd_size) ? _sd_size : 0;
_sd_ram = DEFINED(_sd_ram) ? _sd_ram : 0;
_pnvram = 32;
_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;
_fs_end = _fs_start + _fs_size;
_app_ram_start = 0x20000000 + _sd_ram;
_app_ram_size = _ram_size - _sd_ram;
_app_ram_start = 0x20000000 + _sd_ram + _pnvram;
_app_ram_size = _ram_size - _sd_ram - _pnvram;
_heap_start = _ebss;
_heap_end = _ram_end - _stack_size;
_heap_size = _heap_end - _heap_start;