fix(PeriphDrivers): Fix flash ecc issue for MAX32657 #1300
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Erasing flash will also erase the ECC bits. These bits are not updated until a flash write. Reading from erased memory will signal a ECC error that is falsely corrected from 0xFF to 0xFD on the 16th byte of each 128-bit line. This commit applies a workaround by setting the 16th byte of each line to 0xFF to handle this issue on max32657. Co-authored-by: Mert Vatansever <mert.vatansever@analog.com> Co-authored-by: Kevin Gillespie <kevin.gillespie@analog.com>
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Updated the code to set 16th byte to 0xFF if 16th byte is 0xFD and rest of the bytes are 0xFF. |
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I think this is pretty good for now. There are still some corner cases where we could still be masking an actual ECC error, but I'm also not sure if we'll be able to completely solve the problem. This will only check the range of data that we're reading to make sure it's erased, but we should really check the entire 128 bit line to make sure it's erased. |
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Description
Erasing flash will also erase the ECC bits. These bits are not updated until a flash write. Reading from erased memory will signal a ECC error that is falsely corrected from 0xFF to 0xFD on the 16th byte of each 128-bit line.
This PR applies a workaround by setting the 16th byte of each line to 0xFF to handle this issue for max32657.
This is tested with zephyr/tests/drivers/flash/common. The result is indicated below.