linux-kernel - Re: Investigating SD card failures

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Message-ID: <46AA168B.6000208@roarinelk.homelinux.net>
Date:	Fri, 27 Jul 2007 18:00:11 +0200
From:	Manuel Lauss <mano@...rinelk.homelinux.net>
To:	Pierre Ossman <drzeus-mmc@...eus.cx>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Investigating SD card failures

Hi Pierre,

Thank your for your answer!

Pierre Ossman wrote:
> On Fri, 27 Jul 2007 07:50:26 +0200
> Manuel Lauss <mano@...rinelk.homelinux.net> wrote:
> 
>> Hi Pierre,
>>
>> I have a 1GB SanDisk SD card here which linux does not recognize.
>> Looking at the MMC debug output, I see the MMC core repeatedly
>> issues CMD55/CMD41 commands (which all succeed!) then stops
>> after 100 times.  In sd_ops.c the code checks for a bit to get set.
>> My question is, what exactly is this bit supposed to indicate?
>>
> 
> That the card has initialized. Try extending the time that loop runs and see if the card powers up.

Did that, waited almost 10 seconds, didn't help.  I found a printed
version of the SD spec; it turned out to be a power supply problem.
Apparently the power supply is not strong enough and/or the card
very sensitive to power fluctuations; put in another piece of hardware
with redesigned power supply the card works fine.

Sorry for the noise!

Thanks,
	Manuel Lauss
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