Sorry to Hijack, thanks for that John, I've been wondering that same thing myself, NetBSD is amazing on Sparc64, it's actually a daily for me, I run it on a U10, a U60 and a Blade1000, though, it'd be amazing if someone could pick up the driver support for the XVR-1000 card, I have one for my Blade 1000 that I can't use with NetBSD but just seriously lack the skills to do anything about it, though I am learning C at present, but, rushing in to making a driver as a first big project might be a little ambitious!
Best Regards,
Dan