Re: CRC error when mounting UBIFS

[Artem Bityutskiy <dedekind1@gmail.com>]

On Thu, 2010-06-03 at 17:14 +0200, Leo Barnes wrote:
> Hmm, ok. I would have thought the paranoid UBI checks would be able to
> find driver related problems. I have however now tried creating and
> mounting ubi/ubifs through nandsim on the device, so ubifs seems to be
> working well.

Well, with extra self-checks, UBI reads all it writes and verifies, but
since all writes are aligned, all UBI reads are aligned too.

> I have tried mtd_readtest on the driver which fails when I allow
> OOB-reads. Since the driver handles ECC in hardware and I dont need to
> read the OOB-data for the sake of UBI/UBIFS, this should be no
> problem. When removing the oob-reads from the test, it works
> perfectly.
> 
> You are probably right that what fails is unaligned/short reads, since
> this is exactly the functionality that I had to add to the driver.
> Does any of the mtd-tests test these kinds of reads? Might be a good
> addition if not.

I do not remember, you'd need to look into the test. And of course
patches are welcome.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)