Announcing Q4D06 for XO-1.75
cjb at laptop.org
Tue Mar 27 09:17:12 EDT 2012
Thanks for debugging this!
On Tue, Mar 27 2012, Sascha Silbe wrote:
> Excerpts from Chris Ball's message of 2012-03-26 20:36:21 +0200:
>> > I'm specifically asking because recent kernels don't like my SD card
>> > (only one in about twenty or fifty boots succeeds; two different
>> > failure modes), so I'd need to make sure I diagnose and fix that
>> > before upgrading OFW the next time.
>> That sounds bad, what are the failure modes?
> The first, more common one is that the card is detected, but cannot be
> read from:
> [ 664.720232] mmc0: new ultra high speed SDHC card at address e624
I haven't used a UHS-I card before, so you're in uncharted territory. :)
> git bisect blames the following OLPC commit:
> 39fc327e8d541d146528f03150fec36189e4dac5 is the first bad commit
> commit 39fc327e8d541d146528f03150fec36189e4dac5
> Author: Andres Salomon <dilinger at queued.net>
> Date: Thu Dec 22 16:28:55 2011 -0800
> sdhci-pxa: add retuning of timing in the case of CRC errors
> This is only for the !wlan devices.
> Signed-off-by: Andres Salomon <dilinger at queued.net>
That's very interesting. Does reverting this commit result in a kernel
that boots every time, then?
Chris Ball <cjb at laptop.org> <http://printf.net/>
One Laptop Per Child
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