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.
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Hi,

What does: lsmod | grep ricoh, give you?  Anything?

-- 
Tom Spink
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root@pig:/home/bfields# lsmod | grep ricoh
ricoh_mmc               4352  0 

--b.
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Hi,

So does the MMC card work on other card readers, i.e. it's not
damaged?  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?

Thanks,
-- 
Tom Spink
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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

It doesn't trigger any dmesg output at all.

--b.
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Interesting.  I'd expect to see something appearing about the card.
I'm afraid I'm not sure what to suggest next, if there's no debug

-- 
Tom Spink
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On Wed, 21 May 2008 13:21:04 -0400

Do you have any other MMC cards that work? Ricoh doesn't something

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=882c49...

Rgds
-- 
     -- Pierre Ossman

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