Messages in this thread | | | Date | Thu, 26 Nov 2009 15:15:46 +0000 | From | Alan Cox <> | Subject | Re: [PATCH 16/86] pata_efar: MWDMA0 is unsupported |
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On Thu, 26 Nov 2009 15:53:58 +0100 Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> 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.
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