>The file in question is src/sys/arch/macppc/pci/pci_machdep.c, and I
>think it was this commit: 
>revision 1.27
>date: 2004/12/07 15:42:08;  author: briggs;  state: Exp;  lines: +17 -7
>Bring in some code to deal with devices in the lower slots of a UMAX
>S900 and perhaps PowerMac 9500.  These slots sit behind a PCI-PCI
>bridge, and devices in those slots inherit the PCI-PCI bridge interrupt.

FWIW - I'm almost certain that the 9500 did *not* have a PCI-PCI
bridge on the mboard.  There were two bus controllers.  This is
why the UMAX boxen were a little strange with some PCI cards, cuz
Mac OS 7/8/9 didn't support the PCI-PCI bridge properly.

-dgl-