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. -- Bartlomiej Zolnierkiewicz -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
