Re: PXA27x SD/MMC card CRC errors - only sometimes

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Matthew Mastracci wrote:
> I've been banging my head against a problem with the PXA SD/MMC driver
> for a couple of days and I thought I'd fish for any suggestions here on
> what might be going on.
> 
> I have the driver working on the Palm Treo 650 for *most* SD cards, but
> certain cards cause it to get back invalid CRC data whenever it attempts
> to read from the card.  Since it works in some cases, I guess it's just
> some quirk of the card itself that isn't handled in the driver.
> 
> I tried clocking it down below 19.5MHz (to avoid the PXA27x errata that
> indicates that some cards might be a problem at that speed), but that
> didn't seem to have any effect.
> 
> I figured I'd fish for anything here before I start building up a test
> program from scratch to figure out what might be failing.  Any ideas?

Not sure if it's the same problem:
http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2005-December/032798.html

That thread highlists that the mmc stack doesn't handle errors according
to the spec.

regards,

Koen
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