Hello,
I have great news! I just found out that AVATT is working!!!
The latest kvm version has a CFLAG --disable-nptl. I disabled it yesterday in http://repo.or.cz/w/kvm-coreboot.git?a=commitdiff;h=910b66268ed5a7a72a57a1b2... and recompiled kvm, but I haven't tested it at that time to see whether it works or not.
Today I did it, and it seems that OpenBSD's livecd is starting, but unfortunatelly it crashes after a while. So does NetBSD's, but it's a huge progress. See the images at http://panzer.utcluj.ro/~alien/coreboot/AVATT/screenshots/running/
Best regards, Cristi.