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

Sergei Shtylyov
2009-11-26T16:43:12Z

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