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* Add a CRC32 over progmem and ESP.checkFlashCRC Automatically embed a CRC32 of the program memory (including bootloader but excluding any filesystems) in all images in unused space in the bootloader block. Add a call, ESP.checkFlashCRC() which returns false if the calculated CRC doesn't match the one stored in the image (i.e. flash corruption). Fixes #4165 * Add example that corrupts itself, comments Show CRC checking catch a 1-bit error in program code by corrupting a large array, and then return it to clean and verify the CRC matches once again. Add comments to the CRC check routine Clean up pylint complaints on crc32bin.py * Check linker script for CRC space in bootsector Add an assertion in the eboot linker file to guarantee that we have at least 8 bytes of unused space at the end of the boot sector to patch in the CRC. If not, the eboot link will fail. * Add note about what to do if CRC check fails Per discussion with @d-a-v. When the CRC check fails, you could *try* to do certain things (but may not succeed since there is known flash corruption at that point). List a few ideas for application authors. * Only single, flash/ram friendly crc32() function * Combine the CRC calc and bin generation in 1 step Per discussion w/@mcspr, combine the CRC calculation with the binary generation, removing the additional build step.
