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

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Message-ID: <20080522182217.GA10760@fieldses.org>
Date:	Thu, 22 May 2008 14:22:17 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Tom Spink <tspink@...il.com>
Cc:	drzeus-mmc@...eus.cx, linux-kernel@...r.kernel.org
Subject: Re: 2.6.24 not recognizing 2G MMC card?

On Thu, May 22, 2008 at 07:10:22PM +0100, Tom Spink wrote:
> 2008/5/22 J. Bruce Fields <bfields@...ldses.org>:
> > On Wed, May 21, 2008 at 07:01:10PM +0100, Tom Spink wrote:
> >> 2008/5/21 J. Bruce Fields <bfields@...ldses.org>:
> >> > 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.
> >> >
> >> > I'm using a stock Ubuntu 8.04 kernel, which reports itself as
> >> > 2.6.24-16-generic.
> >> >
> >> > Skimming through commits to drivers/mmc,
> >> > 5ae70296c85f96a9969891d9de3410ebdf210b71 "mmc: Disabler for Ricoh MMC
> >> > controller", looks relevant, but seems to be included in 2.6.24.
> >> >
> >> > Anything I should try?  Thanks in advance for any suggestions.
> >> >
> >> > --b.
> >>
> >> Hi,
> >>
> >> What does: lsmod | grep ricoh, give you?  Anything?
> >
> > root@pig:/home/bfields# lsmod | grep ricoh
> > ricoh_mmc               4352  0
> >
> > --b.
> >
> 
> So does the MMC card work on other card readers, i.e. it's not
> damaged?

I use it in a Nokia 770, and it works there.

It needs an adapter for the laptop which it doesn't need for the 770;
googling around.... Something that looks like this:

	http://www.globemaster.com.tw/data/rs mmc adapter.jpg

So I suppose the adapter could be broken.  Seems unlikely,
though--doesn't look like it does anything more than make the card
fit physically in the slot.

> When you plug the card into the reader, can you check dmesg
> and see if there's any relevant information in there, and post it
> here?

It doesn't trigger any dmesg output at all.

--b.
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