linux-kernel - Re: Experimental driver for Ricoh Bay1Controller SD Card readers

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Message-ID: <20070109205758.GA6643@bouh.residence.ens-lyon.fr>
Date:	Tue, 9 Jan 2007 21:57:58 +0100
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Sascha Sommer <saschasommer@...enet.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, rmk+mmc@....linux.org.uk
Subject: Re: Experimental driver for Ricoh Bay1Controller SD Card readers

Hi,

Sascha Sommer, le Sun 07 Jan 2007 00:32:26 +0100, a écrit :
> Attached is a very experimental driver for a Ricoh SD Card reader that can be 
> found in some notebooks like the Samsung P35.

Yehaaaw! That reader can be found on DELL X300 too. It works almost fine
for me, see attached dmesg. These I/O errors didn't prevent me from
mounting a card, though.

> In order to write this driver I hacked qemu to have access to the cardbus 
> bridge containing this card. I then logged the register accesses of the 
> windows xp driver and tryed to analyse them.

Great to see people brave enough to do such tedious work :D

> - I only tested with a 128 MB SD card, no idea what would be needed to support
>   other card types

Unfortunately, I don't have other cards either.

> - only tested with kernel 2.6.18

Tested with 2.6.19 without source change.

> apart from all these problems reading an image from my sd card seems to have 
> worked ;) 

The IO errors make dd stop on my box. I tried to set TIMEOUT to 1000
(this is a slow card) without better results. Tell me if there are
things I can test.

I'm not subscribed to linux-kernel, so please remember to Cc me when
posting updates, etc. so I can test them.

Samuel

View attachment "dmesg" of type "text/plain" (1994 bytes)