Here is the lists of operating systems that I'm able and not able to run on QEMU PPC:
DETAILS:
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FreeBSD 8.1 PPC
>> =============================================================
>> OpenBIOS 1.0 [Aug 17 2010 14:41]
>> Configuration device id QEMU version 1 machine id 2
>> CPUs: 1
>> Memory: 1024M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,750
Welcome to OpenBIOS v1.0 built on Aug 17 2010 14:41
Trying cd:,\\:tbxi...
Consoles: Open Firmware console
FreeBSD/powerpc Open Firmware loader, Revision 0.1
Memory: 1048576KB
Booted from: cd
Loading /boot/defaults/loader.conf
/boot/kernel/kernel data=0x72c6b8+0x3e280 syms=[0x4+0x5ac10+0x4+0x7d8ad]
/
Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel]...
Kernel entry at 0x100100 ...
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NETBSD 5.0.2 (netbsd-ofppccd-5.0.2.iso) PPC64
C>> annot manage 'OHCI USB controller' PCI device type 'usb':
>> 106b 3f (c 3 10)
>> =============================================================
>> OpenBIOS 1.0 [Aug 17 2010 14:41]
>> Configuration device id QEMU version 1 machine id 3
>> CPUs: 1
>> Memory: 1024M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,970FX
Welcome to OpenBIOS v1.0 built on Aug 17 2010 14:41
Trying cd:,\\:tbxi...
-------------------------------------------------------------------------------
NETBSD 5.0.2 (netbsd-ofppccd-5.0.2.iso) PPC
>> =============================================================
>> OpenBIOS 1.0 [Aug 17 2010 14:41]
>> Configuration device id QEMU version 1 machine id 2
>> CPUs: 1
>> Memory: 1024M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,750
Welcome to OpenBIOS v1.0 built on Aug 17 2010 14:41
Trying cd:,\\:tbxi...
-------------------------------------------------------------------------------
NETBSD 5.0.2 (netbsd-prepcd-5.0.2.iso) PPC
>> =============================================================
>> OpenBIOS 1.0 [Aug 17 2010 14:41]
>> Configuration device id QEMU version 1 machine id 2
>> CPUs: 1
>> Memory: 1024M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,750
Welcome to OpenBIOS v1.0 built on Aug 17 2010 14:41
Trying cd:,\\:tbxi...
>> Not a bootable ELF image
No valid state has been set by load or init-program
0 >
-------------------------------------------------------------------------------
SLES 11 SP1 PPC
>> =============================================================
>> OpenBIOS 1.0 [Aug 17 2010 14:41]
>> Configuration device id QEMU version 1 machine id 2
>> CPUs: 1
>> Memory: 1024M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,750
Welcome to OpenBIOS v1.0 built on Aug 17 2010 14:41
Trying cd:,\\:tbxi...
No valid state has been set by load or init-program
0 >
-------------------------------------------------------------------------------
AIX 4.3.3 PPC, AIX 5.1 PPC, AIX 6.1 PPC
>> =============================================================
>> OpenBIOS 1.0 [Aug 17 2010 14:41]
>> Configuration device id QEMU version 1 machine id 2
>> CPUs: 1
>> Memory: 1024M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,750
Welcome to OpenBIOS v1.0 built on Aug 17 2010 14:41
Trying cd:,\\:tbxi...