Follow-up Comment #6, bug #38659 (project avrdude):
> For r1097 avrftdi indeed reads 0xff for the entire flash.
> I don't know why this does not get written to the output file.
When reading flash memory, trailing 0xff bytes are omitted
from the output file, because they are simply assumed to be
unprogrammed flash cells.
Consequently, if you read back the flash contents from a
device that has been erased, the resulting hex file only
consists of the end record:
:00000001FF
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