From: schwarzb@ipms.fraunhofer.de (Markus Schwarzenberg)
To: linux-arm-kernel@lists.infradead.org
Subject: S3C6400 SMDK6400 HSMMC problem
Date: Wed, 28 Oct 2009 14:47:48 +0100 [thread overview]
Message-ID: <20091028144748.3a01adfa@linpcd55> (raw)
In-Reply-To: <20091026153139.GC8096@trinity.fluff.org>
On Mon, 26 Oct 2009 15:31:40 +0000 Ben Dooks <ben@trinity.fluff.org> wrote:
> > However the kernel's sdhci driver has problems (I/O errors) using the same
> > S3C6400 HSMMC 0 (see below) when trying to mount the root partition from
> > the SD Card.
>
> It is possible there is a problem with the setup data being passed for
> the system, since the controller has some feedback controls that are
> in an extended part of the SDHCI controller space.
thanks. now it turned out that with unrecommended feedback control
settings (FCSEL[2]=0 for for Normal Speed mode) the I/O errors are gone.
in the original setup arch/arm/mach-s3c6400/setup-sdhci.c it's done
as recommended by Samsung and the same way it's done in OpenMoko/qi.
--
Markus
prev parent reply other threads:[~2009-10-28 13:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-22 15:27 S3C6400 SMDK6400 HSMMC problem Markus Schwarzenberg
2009-10-26 15:31 ` Ben Dooks
2009-10-28 13:47 ` Markus Schwarzenberg [this message]
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