Re: another issue with ubifs on v3.6-rc2: attaching an formatted device

Artem Bityutskiy
2012-08-21T10:10:31Z

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On Tue, 2012-08-21 at 11:35 +0200, Uwe Kleine-König wrote:
> On Mon, Aug 20, 2012 at 10:11:07PM +0300, Artem Bityutskiy wrote:
> > On Mon, 2012-08-20 at 18:07 +0200, Uwe Kleine-König wrote:
> > > [ 163.714143] uncorrectable error :
> > > [ 163.727597] UBI warning: ubi_io_read: error -74 (ECC error) while
> > > reading 64 bytes from PEB 0:0, read only 64 bytes, retry
> > > [ 163.740737] uncorrectable error :
> > > [ 163.744032] UBI warning: ubi_io_read: error -74 (ECC error) while
> > > reading 64 bytes from PEB 0:0, read only 64 bytes, retry
> > > [ 163.757119] uncorrectable error :
> > > [ 163.760487] UBI warning: ubi_io_read: error -74 (ECC error) while
> > > reading 64 bytes from PEB 0:0, read only 64 bytes, retry
> > > [ 163.774427] uncorrectable error :
> > > [ 163.777808] UBI error: ubi_io_read: error -74 (ECC error) while
> > > reading 64 bytes from PEB 0:0, read 64 bytes
> >
> > This looks like your flash does not really support sub-pages while
> > declares that it does. Check it with MTD subpage test.
> the subpages test fails with:
>
> [ 82.435792] mtd_subpagetest: written up to eraseblock 7424
> [ 82.905775] mtd_subpagetest: written up to eraseblock 7680
> [ 83.375201] mtd_subpagetest: written up to eraseblock 7936
> [ 83.840447] mtd_subpagetest: written 8192 eraseblocks
> [ 83.845522] mtd_subpagetest: verifying all eraseblocks
> [ 83.852740] uncorrectable error :
> [ 83.856086] mtd_subpagetest: error: read failed at 0x0
> [ 83.861469] mtd_subpagetest: error -74 occurred
> [ 83.866093] =================================================
> Error: could not insert module ./drivers/mtd/tests/mtd_subpagetest.ko: Bad message
>
> I don't have a clue yet how to debug that further. Will start with
> checking older kernel releases. Any hints welcome.

AFAIR, the driver did not support subpages and just needed to report
about this. And there is a bug in MTD which makes it impossible for
drivers to tell that sub-pages are not supported. So AFAIU, we need the
patch I pointed you, and we also need the driver to use "no subpage
writes" option.

I think the maintainer is the best person to comment on this. I assume
this is the gpmi driver, so that would be Huang Shijie
<shijie8@gmail.com>.

--
Best Regards,
Artem Bityutskiy

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