For anyone else who is playing with this in OS X Mavericks, I've written a blog post describing how to get things working on it (there are a couple steps that need to be tweaked.) - http://blog.ljs.io/post/71424794630/xv6
Hopefully this is useful to somebody and isn't too blatantly link whorey :)
Hopefully this is useful to somebody and isn't too blatantly link whorey :)