Re: AGP bogosities

From: Jesse Barnes
Date: Fri Mar 11 2005 - 11:45:02 EST

On Thursday, March 10, 2005 8:30 pm, Benjamin Herrenschmidt wrote:
> On Thu, 2005-03-10 at 20:02 -0800, Jesse Barnes wrote:
> > On Thursday, March 10, 2005 6:38 pm, Benjamin Herrenschmidt wrote:
> > > 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...
> >
> > Both of the video cards are sitting on agp busses in agp slots hooked up
> > to host to agp bridges.
> >
> > > Are you sure there is any real AGP slot in there ?
> >
> > Yes :)
> Well, according to your lspci, none of the bridges exposes a device with
> AGP capabilities...

There are no bridges listed in my lspci output, that's probably why. :)

> It looks like you aren't exposing the host "self"
> device on the bus. Do you have an AGP driver ? If yes, it certainly
> can't use any of the generic code anyway ...

Right, it's a special agp driver, sgi-agp.c.

> I still think that the matching between a bridge and a card should be a
> bridge callback (with eventually a generic one that works for whatever
> x86 are around) so that the bridge driver can deal with funky layouts. I
> have no time to toy with this at the moment though ;)

Mike, does this sound ok? Maybe you could hack something together?

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