AGPGART driver for ArticiaS - ioremap() problem

Gerhard Pircher gerhard_pircher at
Thu Jan 12 19:15:13 EST 2006


> --- Ursprüngliche Nachricht ---
> Von: Benjamin Herrenschmidt <benh at>
> An: Gerhard Pircher <gerhard_stamer at>
> Kopie: linuxppc-dev at, debian-powerpc at
> Betreff: Re: AGPGART driver for ArticiaS - ioremap() problem
> Datum: Thu, 12 Jan 2006 15:44:27 +1100
> On Wed, 2006-01-11 at 22:00 +0100, Gerhard Pircher wrote:
> > Hi,
> > 
> > David Bentam and I are trying to get a AGPGART driver working for the
> > AmigaOne and the Pegasos1. The driver detects the aperture size of the
> > ArticiaS AGP bridge, but fails at the ioremap() function in the generic
> > GATT table create function. Does the PowerPC platform behaves
> > differently for the mapping of address location for AGP operation than
> > the x86 platform? Is it possible to use a mask to relocate the AGP
> > address space to a specific location?
> Well, what value are you passing to ioremap ?
> Ben.
Please take a look at the end of my previous mail, where I included the
debug messages of the driver and the driver code itself. The log shows that
the physical address is mapped (IMHO) to the PCI memory range (>
0x0c0000000). Is this correct? Shouldn't it be mapped to the system memory
address range?

The aperture size is 4MB, page_order should be 1 and num_entries = 1024.

Hope this helps!? :-)




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