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

Sergei Shtylyov
2009-11-26T15:32:17Z

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?

MBR, Sergei