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771c16f3d9
Prior to this commit, only sector 0 was erase/write protected, which may not be enough to protect all of mboot (especially if mboot lives at a higher address than the start of flash). This commit makes sure all internal flash sectors that mboot lives in are protected from erasing and writing. The linker script must define _mboot_writable_flash_start for this to work. Signed-off-by: Damien George <damien@micropython.org>