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

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Message-ID: <4B0EB057.10301@ru.mvista.com>
Date:	Thu, 26 Nov 2009 19:44:07 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.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

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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