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

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Message-Id: <200911261729.46700.bzolnier@gmail.com>
Date:	Thu, 26 Nov 2009 17:29:46 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/86] pata_efar: MWDMA0 is unsupported

On Thursday 26 November 2009 05:17:00 pm Sergei Shtylyov wrote:
> Hello.
> 
> 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

--
Bartlomiej Zolnierkiewicz
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