Re: [PATCH 16/86] pata_efar: MWDMA0 is unsupported

Bartlomiej Zolnierkiewicz
2009-11-26T15:41:31Z

On Thursday 26 November 2009 04:33:13 pm Sergei Shtylyov wrote:
> Hello.
>
> Alan Cox wrote:
>
> >>On Wednesday 25 November 2009 06:25:52 pm Alan Cox wrote:
>
> >>>On Wed, 25 Nov 2009 18:04:15 +0100
> >>>Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> wrote:
>
> >>>>From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> >>>>Subject: [PATCH] pata_efar: MWDMA0 is unsupported
>
> >>>>MWDMA0 timings cannot be met with the PIIX based controller
> >>>>programming interface.
>
> >>>The efar documentation makes no reference to not being capable of MWDMA0,
> >>>so where does this come from ? No MWDMA0 is an Intel erratum it appears.
>
> >>No MWDMA0 support is a common issue on all 'PIIX-like' controllers.
>
> >>In case of this chipset while the (preliminary) documentation claims MWDMA0
> >>support on the 'FEATURES' page the later 'programming guide' part describes
> >>only PIO0-4, SWDMA2, MWDMA1-2 and UDMA0-4 transfer modes as supported.
>
> > Cool - I only have the original docs.
>
> Hm, me too... perhaps worth putting in Jeff's documentation archive?

Me too? I just have what 'The Good Uncle Google' has..

--
Bartlomiej Zolnierkiewicz