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

[Sergei Shtylyov]

Bartlomiej Zolnierkiewicz wrote:

> > > > > > > > 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?

> > > Me too?  I just have what 'The Good Uncle Google' has..

> >    Well, I've googled for it and was unable to find any valid links even to 
> > my preliminary version anymore. Perhaps I haven't looked hard enough...

> Maybe... ;)

> FWIW my file is called 38384_SMSC_SLC90E66.pdf

   Well, that brought me to some Chinese site with 07/10/2002 version 
(which I've already found minutes before that). But it still claims support 
for MWDMA0 under the features... ah, I need to look further down... no 
"programming guide" part, hm... but thanks anyway. :-)

> --
> Bartlomiej Zolnierkiewicz

WBR, Sergei
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