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

[Sergei Shtylyov]

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@xxxxxxxxx> wrote:

> > > > From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
> > > > 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?

MBR, Sergei
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