linux-kernel - Re: My SD Card Reader cannot read SDHC cards

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Message-ID: <50BA85A7.7060206@gentoo.org>
Date:	Sat, 01 Dec 2012 17:33:11 -0500
From:	Richard Yao <ryao@...too.org>
To:	Roger Heflin <rogerheflin@...il.com>
CC:	kernel@...too.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: My SD Card Reader cannot read SDHC cards

On 12/01/2012 01:30 PM, Roger Heflin wrote:
> On Sat, Dec 1, 2012 at 6:04 AM, Richard Yao <ryao@...too.org> wrote:
>> Standard Microsystems Corp. 8-in-1 Card
>> Reader
> 
> Does that card reader support SDHC cards?    The older readers don't
> support >2GB (ie sdhc)
> cards, and that would mean a 2GB card works and the 4GB or larger ones won't.

SDHC is defined in version 2.0 of the Secure Digital specification,
which did not exist when this card reader was made. From what I have
read, the main difference aside from additional space is a change in the
format of the Card-Specific Data register. Newer SD Card readers have no
problem handling both formats and I expect that it is possible to modify
older SD Card Readers to support it.

I am not familiar with the subsystem involved, so I need some pointers
before I can start looking at it.

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