Without the QEMU command line and a link to the FreeBSD .iso that's rather hard... "above 32-bit boundary" sounds like ppc64, but the PowerPC,750 (G3) is 32-bit only. Could be some QEMU guest vs. host bitness issue, or just the bootloader going haywire due to bugs in OpenBIOS.
I am using the latest version of QEMU from GIT as of 25/8/10. I don't know how to get a "git commit hash", so I can't quote it.
The kernel starts OK then loops after "Kernel entry at 0x100100 ...".
The command I am running is
qemu-system-ppc -cdrom FreeBSD-
I obtained the kernel from ftp://ftp.
Regards,
-Nigel