[Qemu-devel] Multiple pci buses

[BALATON Zoltan <balaton@eik.bme.hu>]

Hello,

I'm trying to change hw/ppc/mac_newworld.c and hw/pci-host/uninorth.c to 
bring the mac99 machine type closer to what's seen in these dumps:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=604134
http://nandra.segv.jp/NetBSD/G4.dump-device-tree.txt
http://raveland.org/ports/eeprom.txt
http://mail-index.netbsd.org/port-macppc/2007/10/24/0000.html

This machine seems to have 3 pci busses but the third is not important 
just the other two:

ff8721c0: /pci@f0000000
ff898cd0:   /uni-north-agp@b
ff898f40:   /ATY,Rage128Ps@10
ff873268: /pci@f2000000
ff8742d8:   /pci-bridge@d
ff876368:     /mac-io@7

The first is actually an AGP bus with the onboard graphics card and the 
second is where other devices are. It would be enough to create an empty 
bus without the AGP graphics card for now and have the devices on the 
second bus. The pci_pmac_init function in uninorth.c seems to have some 
commented out code to try to model this but that does not work. Can 
someone who understands this better please explain what should be done to 
model the above? How to create two pci buses and connect them to separate 
memory regions?

Thank you,
BALATON Zoltan