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Date: 15 Jul 2004 08:15:19 -0000
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From: "Rico Tudor" <rico-linux-kernel-2004@patternassociates.com>
To: dwoods@fastclick.com
Subject: Re: Problems with DMA on IDE/ServerWorks/Seagate.
Cc: linux-kernel@vger.kernel.org
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>Date:	Wed, 14 Jul 2004 17:16:14 -0700
>From:	"Dave Woods" <dwoods@fastclick.com>
>...
>We have diagnosed a problem (file corruption) using Ultra DMA & IDE with
>
>ServerWorks OSB4 Chipset and Seagate drives under heavy disk I/O.
>...

This chipset has buggy IDE DMA.

I maintain several boxes with OSB4 and IDE devices (HD, CDR-W, DVD-RW).
Best solution is using an add-on card (e.g. Promise Ultra66 card).
Otherwise, I found two configurations that always work: multi-device,
and single-device.  In multi-device, operate all devices in PIO -
no exceptions!  In single-device, meaning the other three interfaces
are unused, you can safely enable MW-DMA Mode 2.