Zipit/uboot mmc driver issue

[Phip]

2010/11/18 Marek Vasut <marek.vasut at gmail.com>

> On Thursday 18 November 2010 11:45:16 Phip wrote:
> > 2010/11/18 Marek Vasut <marek.vasut at gmail.com>
> >
> > > On Thursday 18 November 2010 10:26:49 Phip wrote:
> > > > Greetings,
> > > >
> > > > I am having difficulties with the Zipit mmc driver and my SDHC card.
> I
> > > > realize this may be an imposition; I write to you because I am trying
> > > > to determine if the problem is with the mmc driver or elsewhere. I
> was
> > > > not having any problems with SD card I/O under blob; this began when
> I
> > >
> > > flashed
> > >
> > > > to u-boot.
> > >
> > > Blob doesn't support SD/MMC at all. You mean linux kernel ?
> >
> > Yes; My mistake.
> >
> > > > dmesg comes to mounting root:
> > > >
> > > > pxa-rtc pxa-rtc: setting system clock to 2000-01-01 00:00:18 UTC
> > > > Waiting 2sec before mounting root device...
> > > > mmc0: host does not support reading read-only switch. assuming
> > > > write-enable. mmc0: new SDHC card at address 1234
> > > > PM: Adding info for mmc:mmc0:1234
> > > > mmcblk0: mmc0:1234 SA04G 2.68 GiB
> > >
> > > The card is mis-detected ?
> >
> > This was a  typo -- it consistently reads 3.68 GiB.
> >
> > > > Then a few cycles of write errors like these:
> > > >
> > > > mmcblk0: error -84 transferring data, sector 243, r 8, card status
> > > > 0xe00 end_request: I/O error, dev mmcblk0, sector 243
> > > > Buffer I/O error on device mmcblk0p1, logical block 0
> > > > lost page write due to I/O error on mmcblk0p1
> > > >
> > > > And finally EXT3-fs detects a problem with the journal and remounts
> the
> > > > filesystem read-only.
> > > >
> > > > I do not mean to ask you to troubleshoot me, but it seems like you
> > > > would
> > >
> > > be
> > >
> > > > the best person to ask about this particular combination of hardware
> > > > and software. Or perhaps there is a better place for me to ask?
> > >
> > > CCing linux-arm-kernel
> > >
> > > > Thank you very much for your time
> > > > Phip
> > > >
> > > > - Zipit running u-boot 8/23/2010; 2.6.35 8/22/2010; both from
> mozzwald
> > > > - SD card is a Kensington 4GB microSD in a miniSD adapter; works
> > >
> > > flawlessly
> > >
> > > > on my desktop box.
> > >
> > > Maybe the adapter is faulty, try another one. It happened a lot before.
> >
> > I'll look for another adapter to verify if there are no other leads to
> try.
>
> This is very likely the issue, really ... this is where I'd start debuging
> if I
> were you.
>
> I will. I have second thoughts though because when the zipit was flashed
with the 2.6.29 kernel, I was able to write to the SD card and everything
worked as expected. When I flashed to u-boot is when this problem began, and
that makes me suspect u-boot over the card adapter.
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