mmc errors (was Re: [PATCH] arm: Fix DEBUG_LL for omap zoom2/3)

Madhusudhan at
Wed Mar 24 11:35:12 EDT 2010

> -----Original Message-----
> From: Nishanth Menon [mailto:nm at]
> Sent: Tuesday, March 23, 2010 5:49 PM
> To: Tony Lindgren
> Cc: Pais, Allen; linux-arm-kernel at; linux-
> omap at; Pandita, Vikram; Madhusudhan Chikkature Rajashekar
> Subject: mmc errors (was Re: [PATCH] arm: Fix DEBUG_LL for omap zoom2/3)
> Tony Lindgren had written, on 03/23/2010 10:27 AM, the following:
> [...]
> > Then at least one issue remains for zoom3 to be usable..
> > I'm getting tons of MMC errors trying to mount root on it:
> >
> > mmcblk1: error -110 transferring data, sector 2097024, nr 8, card status
> 0x900
> > end_request: I/O error, dev mmcblk1, sector 2097024
> > ...
> >
> I have seen this on few platforms and seem to be related to eMMC usage.
> > Any ideas if that's fixed somewhere also?
> Madhu, any comments?
Sorry about multiple replies to this mail. Just wanted to avoid top posting.

The eMMC on Zoom2 has an issue with respect to detection as a high
capacity card. This was discussed on the list with Pierre sometime back. I
don't have an acceptable solution to make this device work. Rather I
prefer to submit a patch which disables MMC2 on these boards.
You can still use MMC1 to mount your file system. This is the card you can
plug in to the cage.

> --
> Regards,
> Nishanth Menon

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