Filesystems over UBI can't handle badblocks

[Richard Weinberger]

Am 29.02.2016 um 18:53 schrieb Guilherme de Oliveira Costa:
>> I guess the reporter would come up with a good justification.
>>
>> I can imagine one, but it is not very strong: you have a development
>> device, you mess with bad blocks by marking/unmarking them for some
>> research reasons. You put UBI image there, then remember that some
>> of the blocks were bad and want to mark them as bad without re-
>> flashing UBI. Kind of a developer convenience.
> 
> Indeed. Originally, we were using cramfs over mtdblock, but were running on all sorts of problems during testing due to random corruptions. I wanted to mess with the partition blocks to check how cramfs over UBI would handle badblocks and bit-errors.

What you can do is mounting debugfs and set /sys/kernel/debug/ubi/ubi<NUM>/tst_emulate_bitflips to 1.

Thanks,
//richard