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Add Checksums to Firmware & External App images (#1809)

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* Pad image to 1MB and add simple checksum

* Test code to verify firmware checksum

* Comment out unneeded zlib

* Add files via upload

* Print space remaining in ROM

* Append checksum to external apps too

* Check external app checksums when loading

* Is it 2024 already?!

* Validate firmware checksum before flashing

* Add files via upload

* Added flash error warning to nav screen

* Clang

* Replaced some hard-coded values with #defines

* Check FW checksum before USB serial flash too

* Add files via upload
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Mark Thompson 2024-01-24 16:37:21 -06:00 • committed by GitHub
parent 2d98c5d311
commit 6a6c6d6502
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13 changed files with 179 additions and 13 deletions
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21
firmware/tools/make_spi_image.py
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@ -74,7 +74,24 @@ for image in images:
padded_data = image['data'] + (spi_image_default_byte * pad_size)
spi_image += padded_data
if len(spi_image) > spi_size:
raise RuntimeError('SPI flash image size of %d exceeds device size of %d bytes' % (len(spi_image), spi_size))
if len(spi_image) > spi_size - 4:
raise RuntimeError('SPI flash image size of %d exceeds device size of %d bytes' % (len(spi_image) + 4, spi_size))
pad_size = spi_size - 4 - len(spi_image)
for i in range(pad_size):
spi_image += spi_image_default_byte
# quick "add up the words" checksum:
checksum = 0
for i in range(0, len(spi_image), 4):
checksum += (spi_image[i] + (spi_image[i + 1] << 8) + (spi_image[i + 2] << 16) + (spi_image[i + 3] << 24))
final_checksum = 0
checksum = (final_checksum - checksum) & 0xFFFFFFFF
spi_image += checksum.to_bytes(4, 'little')
write_image(spi_image, output_path)
percent_remaining = round(1000 * pad_size / spi_size) / 10;
print ("Space remaining in flash ROM:", pad_size, "bytes (", percent_remaining, "%)")