linux-kernel - Re: Investigating SD card failures

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Message-ID: <20070727163035.4ec23c19@poseidon.drzeus.cx>
Date:	Fri, 27 Jul 2007 16:30:35 +0200
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	Manuel Lauss <mano@...rinelk.homelinux.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Investigating SD card failures

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.

-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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