Subject: Re: AGP bogosities
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Jesse Barnes <jbarnes@engr.sgi.com>
Cc: Paul Mackerras <paulus@samba.org>, werner@sgi.com,
       Linus Torvalds <torvalds@osdl.org>, davej@redhat.com,
       Linux Kernel list <linux-kernel@vger.kernel.org>
In-Reply-To: <200503101818.25033.jbarnes@engr.sgi.com>
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Date: Fri, 11 Mar 2005 13:38:35 +1100
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On Thu, 2005-03-10 at 18:18 -0800, Jesse Barnes wrote:
> On Thursday, March 10, 2005 6:11 pm, Paul Mackerras wrote:
> > What is the relationship in the PCI device tree between the video
> > cards and their bridges?  Is there for instance only one AGP bridge
> > per host bridge?
> 
> I *think* a TIO (numalink<->agp & numalink<->pci) has two AGP busses coming
> off of it...
> 
> > Interesting, could you post the output from lspci -v on that system?
> 
> flatearth:~ # lspci -v


 .../...

That one is even worse... from what I see in your lspci output, you have
no bridge with AGP capability at all, and the various AGP devices are
all siblings...

Are you sure there is any real AGP slot in there ?

I'm afraid we may have to do the card <-> bridge machine as a bridge
specific function. At least the bridge driver can "know" how the HW for
that specific bridge lays out the PCI view of the AGP slot.

Ben.


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