I just noticed we weren't testing preerase with non-0xff ecksums at all!
Added to relevant tests:
# test with a number of different erase values
defines.ERASE_VALUE = [0xff, 0x00, -1]
The most important non-0xff value being -1 (noop erases), which should
usually result in fragmented ecksums.
Note this was copied from test_rbyd, where we do something similar to
test non-0xff ecksums in rbyd logs.
Christopher Haster
c07a69c2a6