From owner-freebsd-current@FreeBSD.ORG  Tue Mar 23 10:56:40 2004
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Date: Tue, 23 Mar 2004 20:56:00 +0200 (EET)
From: Kalev Lember <kalev@colleduc.ee>
To: Julian Elischer <julian@elischer.org>
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cc: freebsd-current@freebsd.org
Subject: Re: Problem with FreeBSD (4.9-REL to 5.2.1-REL) on NForce 2
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On Tue, 23 Mar 2004, Julian Elischer wrote:

> We had one here and 4.2 oinstalled ok..
> to get anything newer we had to disable DMA on the ata drives.
> (types something in the boot line but I forget what..) (Don't have hte
> machine any more)
> (and afterwards we added it to /boot/loader.conf)

I think it was:
set hw.ata.ata_dma="0"
Give it a try, it is just off top of my head.
You could also try
set hw.ata.atapi_dma="0"
set hw.ata.wc="0"

-- 
Kalev Lember