$ qemu/qemu/ppc-softmmu/qemu-system-ppc -M prep -kernel zImage.prep linux-ppc.img -use-gtk -serial stdio
PPC Open Hack'Ware BIOS for qemu version 0.3
Build 2004-07-07 08:55:18
Copyright 2003-2004 Jocelyn Mayer

Memory size: 144 MB.
Booting from device m
Probing PCI devices
Check PCI bridges
Cannot manage 'PCI host bridge' PCI device type 'pci':
 1057 4801 (6 0 0)
Check PCI devices
Cannot manage 'PCI host bridge' PCI device type 'pci':
 1057 4801 (6 0 0)
Found PCI device 1234:1111 0-96 3 0
=> 'Qemu VGA' 'display' 'Qemu VGA' 'VGA' (05809558)
register 'Qemu VGA' 'display' 'VGA' 'Qemu VGA' 0x0000000c in '<null>' 0x38000000
Done 00000000 0581f7ac
Map PCI device 0:96 0 to f0000008 00400000 (memory)
Set VGA to f0000000
Set display 'Qemu VGA' path to '/8@38000000'
PCI probe done (0581f61c)
ERROR: BUG catched...
No floating point exception
nip=0x05807428 msr=0x00000000 dar=0x00000000 dsisr=0x00000000
Stopping execution