Re: [Xen-devel] Domain 0 hardware problem with nForce2 AGP?

[Gerald Britton <gbritton@xxxxxxxxxxx>]

There was a thread a month or two ago on this (largely with me trying to
get agpgart working here).  It still ends up instantly rebooting for me
when X tries to do any agpgart stuff.  I've got a radeon here, and the agpgart
and drm modules seem happy, it just blows up when X tries to start.  You
may want to read over that and it might give you a few pointers on how to
potentially make progres.  I unfortunately don't have a serial port on my
thinkpad, so i haven't made much progress since then.

                                -- Gerald

On Mon, Oct 25, 2004 at 01:39:29AM +0100, Mark A. Williamson wrote:
> We don't support agpgart at the moment.
> 
> IIRC, the agpgart driver needs to write to some PCI config-space registers, 
> which Xen currently disallows.  The output you've posted suggests it also 
> needs to see some special bridges too.  Xen hides bridge devices from dom0 
> because for all other purposes, it's not necessary to reveal them.
> 
> It may not be too hard to get arggart working (although it's unlikely to 
> happen for 2.0).  If you (or anyone else) is interested in playing around 
> with this, we'd provide support.  It seems likely that someone here will get 
> round to implementing this eventually though...
> 
> Mark
> 
> On Monday 25 Oct 2004 01:14, Nuutti Kotivuori wrote:
> > On a real kernel boot, I get:
> >
> >   agpgart: Detected NVIDIA nForce2 chipset
> >   agpgart: Maximum main memory to use for agp memory: 816M
> >   agpgart: AGP aperture is 256M @ 0xc0000000
> >
> > On a xen kernel boot, I get:
> >
> >   agpgart: Detected an NVIDIA nForce/nForce2 chipset, but could not find
> > the secondary devices.
> >
> > If I look at lspci listings, there are two entries missing in the Xen
> > kernel version:
> >
> >   0000:00:08.0 PCI bridge: nVidia Corporation nForce2 External PCI Bridge
> > (rev a3) 0000:00:1e.0 PCI bridge: nVidia Corporation nForce2 AGP (rev a2)
> >
> > Now, I am asking, should this work? Do I have a snag in my configs? Or
> > if it shouldn't work, should Xen be fixed or should the nForce AGP
> > driver be fixed? Or am I totally missing something?
> >
> > -- Naked
> >
> >
> >
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