Messages in this thread | | | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: [PATCH 16/86] pata_efar: MWDMA0 is unsupported | Date | Thu, 26 Nov 2009 15:53:58 +0100 |
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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.
-- Bartlomiej Zolnierkiewicz
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