Re: [Qemu-devel] Multiple pci buses

[Alexey Kardashevskiy <aik@ozlabs.ru>]

On 03/16/2014 08:21 AM, BALATON Zoltan wrote:
> 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?

[adding qemu-devel@nongnu.org to cc]

I have no idea how that "pmac" works... On pseries you can add multiple
PHBs via "-device spapr-pci-host-bridge,id=lalala" and then put devices
onto it by "-device e1000,bus=lalala.0" so this should be good reference to
start with.




-- 
Alexey