Re: [Qemu-devel] [PATCH v3 5/6] vga: Use linear mapping + dirty logging in chain 4 memory access mode

[Andreas Färber]

Am 14.09.2011 um 22:42 schrieb Richard Henderson:

> On 09/14/2011 01:35 PM, Alexander Graf wrote:
>
> > > Can you explain what the memory map looks like from the hardware  
> > > point of view?
> >
> > If you can tell me where to find out :). I seriously have zero  
> > experience in VGA mapping - and it sounds as if Blue has a pretty  
> > good idea what's going on.
>
> He's not interested in the VGA bits, but in the PPC board bits.
> How are addresses forwarded from the main system bus to the
> PCI host bridge, for instance?

Does this help?

http://tibit.org/ppc/imac-333.html

The historical dev trees at http://penguinppc.org/historical/dev-trees-html/trees-index.html 
 seem to have disappeared, this iMac seems closest: The ATI VGA card  
sits directly on /pci.

Later models of PowerMac G3 had AGP graphics, the final PowerMac G5  
models had PCIe graphics.
Note that ATI graphic cards were sold as special Mac Edition, so I  
wouldn't completely rule out deviations from PC standards...

Andreas