I think the G2leGP3 CPU has been fixed with this commit here: http://git.qemu.org/?p=qemu.git;a=commitdiff;h=3ade1a055c9ac6c351 and it also seems to work fine when you use the "-M prep" machine type.
** Changed in: qemu Status: New => Fix Released -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1320968 Title: qemu-system-ppc -cpu G2leGP3 crashes Status in QEMU: Fix Released Bug description: qemu crashes when running qemu-system-ppc -cpu G2leGP3 : qemu-system-ppc -cpu G2leGP3 Error: Trying to register SPR 1013 (3f5) twice ! qemu-system-ppc -version QEMU emulator version 2.0.50, Copyright (c) 2003-2008 Fabrice Bellard To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1320968/+subscriptions