S3C6400 SMDK6400 HSMMC problem

[Markus Schwarzenberg]

On Mon, 26 Oct 2009 15:31:40 +0000 Ben Dooks <ben at 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