linux-kernel - Re: GART_IOMMU without AGP

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Message-ID: <20090722231738.21de4deb@lxorguk.ukuu.org.uk>
Date:	Wed, 22 Jul 2009 23:17:38 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Dave Jones <davej@...hat.com>
Cc:	Pavel Vasilyev <pavel@...linux.ru>, linux-kernel@...r.kernel.org
Subject: Re: GART_IOMMU without AGP

On Wed, 22 Jul 2009 17:37:46 -0400
Dave Jones <davej@...hat.com> wrote:

> On Wed, Jul 22, 2009 at 07:26:49PM +0400, Pavel Vasilyev wrote:
>  > In the kernel configuration, if I choose x86_64 and PCI, then choose the item
>  > "Garth IOMMU support", which, in turn, chooses not to switch off, support for
>  > AGP. But many IOMMU system does not have AGP bus.
>  
> The lack of AGP slots doesn't mean a lack of AGP bus.
> It's part of the K8 on-CPU northbridge.

And the user is selecting CONFIG_AGP to select AGP devices rather than to
demonstrate their deep guru grade knowledge of K8 northbridges. Not only
that but CONFIG_AGP controls the display of AGP video card options so it
is a selection for offered devices not really an internal detail.

So I think Pavel is right here.

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