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
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@ -1,15 +1,17 @@
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/* Flash layout: softdevice | application | filesystem */
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/* RAM layout: softdevice RAM | application RAM */
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_sd_size = DEFINED(_sd_size) ? _sd_size : 0;
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_sd_ram = DEFINED(_sd_ram) ? _sd_ram : 0;
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_pnvram = 32;
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_fs_size = DEFINED(_fs_size) ? _fs_size : 64K; /* TODO: set to 0 if not using the filesystem */
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_app_size = _flash_size - _sd_size - _fs_size;
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_app_start = _sd_size;
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_fs_start = _sd_size + _app_size;
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_fs_end = _fs_start + _fs_size;
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_app_ram_start = 0x20000000 + _sd_ram;
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_app_ram_size = _ram_size - _sd_ram;
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_app_ram_start = 0x20000000 + _sd_ram + _pnvram;
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_app_ram_size = _ram_size - _sd_ram - _pnvram;
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_heap_start = _ebss;
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_heap_end = _ram_end - _stack_size;
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_heap_size = _heap_end - _heap_start;
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