linux-kernel - Re: [PATCH 2.6.18 RFC] mmc: Add support for mmc v4 wide-bus modes

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Message-ID: <20061016120839.GA16127@angel.research.nokia.com>
Date:	Mon, 16 Oct 2006 15:08:39 +0300
From:	Jarkko Lavinen <jarkko.lavinen@...ia.com>
To:	"philipl@...rt.org" <philipl@...rt.org>
Cc:	Pierre Ossman <drzeus-mmc@...eus.cx>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.18 RFC] mmc: Add support for mmc v4 wide-bus modes

Hi Philip and Pierre

On Sat, Oct 14, 2006 at 03:15:08PM -0400, philipl@...rt.org wrote:
> I keep getting a data CRC error back - for both the reads and writes.

The spec says these can be ignored, both reads and writes. The
card ignores optional CRC16 when sending data and likewise host
ignores optional CRC when reading back.

Also both the card and the host ignore all but the first two bits of
the test pattern.

> In the command table, it says that it's R1 but the sample code says
NONE.

Both CMD14 and CMD19 have R1 response.

Regards
Jarkko
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