linux-kernel - Re: 2.6.24 not recognizing 2G MMC card?

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Message-ID: <20080528154243.46011abf@mjolnir.drzeus.cx>
Date:	Wed, 28 May 2008 15:42:43 +0200
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24 not recognizing 2G MMC card?

On Wed, 21 May 2008 13:21:04 -0400
"J. Bruce Fields" <bfields@...ldses.org> wrote:

> Please forgive a somewhat naive question--I'm not sure how to go about
> debugging this kind of thing:
> 
> I have a Dell 1420n with card readers reported by lspci as:
> 
> 03:01.1 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22)
> 03:01.2 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev 12)
> 
> I have a 512MB MicroSD card which seems to be recognized fine, but a 2GB
> MMC card is not.
> 

Do you have any other MMC cards that work? Ricoh doesn't something
silly when it comes to MMC cards that fouls things up.

> 
> Anything I should try?  Thanks in advance for any suggestions.
> 

If you have a newer controller, then the ricoh_mmc module won't be able
to do its magic. Try the following patch:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=882c49164d72c45f37d7fa1bb3de7c31cf1a5fab

Rgds
-- 
     -- Pierre Ossman

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