linux-kernel - Re: MMC: commit dba3c29 ruins mmc card data on beagle-xm revB

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Date:	Fri, 15 Jun 2012 09:55:34 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	"T Krishnamoorthy, Balaji" <balajitk@...com>
Cc:	linux-mmc@...r.kernel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Ball <cjb@...top.org>, Venkatraman S <svenkatr@...com>
Subject: Re: MMC: commit dba3c29 ruins mmc card data on beagle-xm revB

On Wed, Jun 13, 2012 at 11:28 PM, T Krishnamoorthy, Balaji
>
> Couldn't reproduce the issue with BeagleXM rev C, Might be a combination
> of rev and SD card. How often do you see mis-match in file content?

Every time after writing file on file system. After umount and mount again,
the file will be found mismatch with original.

>From TRM of OMAP3/OMAP4/DM37x, the below is mentioned about
the Auto CMD12 Enable bit.

         - SDIO does not support this feature.
         - SD card only.

So I am wondering if it is suitable to always enable the bit for
multiple block transfer in host controller driver. You mean that
only SD card is supported by OMAP3/4 and DM37x MMC?

I am just confused with the above, even though it may be not
related with the problem reported here.


Thanks,
--
Ming Lei
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