From owner-freebsd-stable  Wed Jan  2 17:10:13 2002
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Date: Wed, 2 Jan 2002 17:10:21 -0800 (PST)
From: Doug White <dwhite@resnet.uoregon.edu>
To: Thilo Mezger <tm@spoiled.org>
Cc: <stable@FreeBSD.ORG>
Subject: Re: RELENG_4_4: PIIX busmastering DMA not supported
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On Wed, 2 Jan 2002, Thilo Mezger wrote:

> I was wondering if somebody could explain to me why busmastering DMA
> is not supported in my setup (RELENG_4_4):
>
> # dmesg | grep ata
> atapci0: <Intel PIIX ATA controller> port 0xfcf0-0xfcff at device 1.1 on pci0
> atapci0: Busmastering DMA not supported

According to the code, your controller does not claim to support DMA. The
original PIIX probably didn't support it, thinking about it...

Check your BIOS settings and verify that you didn't disable DMA at some
point in the past.

Doug White                    |  FreeBSD: The Power to Serve
dwhite@resnet.uoregon.edu     |  www.FreeBSD.org


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