linux-kernel - Re: [PATCH 7/7] mmc_spi: support for non-byte-aligned cards

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Date:	Wed, 11 Mar 2009 15:21:26 +0000
From:	Will Newton <will.newton@...il.com>
To:	Wolfgang Mües <wolfgang.mues@...rswald.de>
Cc:	Pierre Ossman <drzeus@...eus.cx>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Mike Frysinger <vapier.adi@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] mmc_spi: support for non-byte-aligned cards

On Wed, Mar 11, 2009 at 3:14 PM, Wolfgang Mües
<wolfgang.mues@...rswald.de> wrote:
> Will,
>
> Am Mittwoch, 11. März 2009 schrieb Will Newton:
>> I have not seen these problems or seen them reported by others.
>
> Yes, it is hard to believe that such a design error is present in today SD
> cards. But spi mode is used only by some devices which do not have a SD host
> controller on board.

I have found some older cards that do not work well with SPI mode, but
I had written of these as ancient relics (128Mb or less in capacity).
I was under the impression that more mobile devices are using SPI mode
these days so SPI mode was becoming more of a priority for
manufacturers.

> I know a commercial FAT/SD card software package, and I found that inside
> their spi driver, there is support for non-byte-aligned cards too. So I am
> not the only one who has knowlegde about this problem.
>
> Should I send you one of these cards so you can verify this problem?

I would be interested to know the manufacturer and model number of a
couple of examples certainly, that way hopefully the test would be
truly independent.
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