Current mainline (3.6-rc3) UBIFS errors

[Artem Bityutskiy]

On Thu, 2012-08-23 at 10:39 +0200, David Jander wrote:
> On Thu, 23 Aug 2012 11:10:08 +0300
> Artem Bityutskiy <dedekind1 at gmail.com> wrote:
> 
> > On Thu, 2012-08-23 at 09:50 +0200, David Jander wrote:
> > > [    4.069409] UBI warning: ubi_io_read: error -74 (ECC error) while
> > > reading 160 bytes from PEB 5616:87112, read only 160 bytes
> > 
> > Hi, looks like a problem with your driver. For some reasons it returns
> > ECC errors when reading small amount of data (160 bytes). Did you run
> > mtd tests - to they pass?
> 
> I thought so at first, but this error appeared on two different hardware
> platforms at the same time, when upgrading to latest mainline. I am coming
> from kernel 3.1, which worked fine on the MPC5121e. The ARM platform also
> worked without problems on a previous version (I think it was 3.4-something,
> not so sure right now). The only common piece of hardware/driver is the actual
> NAND flash chip on both boards (Samsung K9K8G08... SLC 8Gbit NAND), so I
> thought this had to be a (temporary) issue in current mainline code.

A change in the mtd layer probably caused this.

> > So UBI just tells that it cannot read, the root-cause is in the driver.
> 
> Two different drivers... same issue!?

Quite possible if there is a bug in mtd layer. First try to find out the
latest working kernel release.

> Can you tell if I am supposed to be able to mount a UBIFS device formatted
> with 3.1 on latest mainline without trouble? Is there a chance OOB layout may
> have changed, or something similar? I tried reformatting with 3.6-rc2 just in
> case, but the problem remained.

Absolutely yes, we maintain on-flash format compatibility and you do not
have to re-format your flash.

-- 
Best Regards,
Artem Bityutskiy
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