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
