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Subject: Re: PATA driver patch for 2.6.17
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andrey Borzenkov <arvidjaar@mail.ru>
Cc: linux-kernel@vger.kernel.org
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Date: Fri, 23 Jun 2006 16:24:38 +0100
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Ar Iau, 2006-06-22 am 20:50 +0400, ysgrifennodd Andrey Borzenkov:
> Not really. AFAIK lowest nibble bit has meaning only in DMA mode anyway.

The BIOS docs are fairly confusing on that point referring to one bit as
the "PIO FIFO" bit.

> Anything else I could try to help pinpoint the problem?

Set the controller to support PIO only and see what happens. 

[ie set .udma_mask = 0 i nthe ali_init_one entries]

If that works it implies the DMA tuning may be involved. If that doesn't
change it what happens with a hard disk in the same place ?