Re: AGPGART driver for ArticiaS - ioremap() problem

["Gerhard Pircher" <gerhard_pircher@gmx.net>]

> --- Ursprüngliche Nachricht ---
> Von: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> An: Gerhard Pircher <gerhard_pircher@gmx.net>
> Kopie: linuxppc-dev@ozlabs.org, debian-powerpc@lists.debian.org
> Betreff: Re: AGPGART driver for ArticiaS - ioremap() problem
> Datum: Sun, 22 Jan 2006 09:48:44 +1100
> 
> On Sat, 2006-01-21 at 02:59 +0100, Gerhard Pircher wrote:
> 
> > Yes, I see. :( The code mostly allocates the resources for the AGPGART
> > driver beyond the real memory space, thus preventing the X server to
> > work. Sometimes the resource is also mapped to where the resource of
> > the graphic card resides (address 0x88000000, compare with the included 
> > iomem file).
> 
> The AGP aperture should generally be located "outside" of those spaces.
> That is above RAM and in some place where no device already resides...
> It can be made to overlap RAM but that isn't a good idea (that's what
> happens on Macs though due to a bug in the Apple chipset).
Ahh, so the AGP aperture should not be within the memory space and any other
PCI/IO address range. Slowly but surely I become confused. ;-)

> I don't see anything related to AGP in your output... you didn't post
> the lspci as root thus it's missing all the useful infos ;)
I included a new lspci output log. :-) (now done as root)

> Also, the AGP base isn't generally a PCI BAR of the bridge... it is one
> in your case ?
I'm afraid I can't answer this question (you know, we have no datasheet for
the ArticiaS yet). From what I can see in the log, there is an unassigned
memory region (type 0, should be <4GB I guess). Could this affect AGP
operation? 

Gerhard

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