Not auto-detected with my 2.6.18-rc2 kernel. Source for a linux driver available from serialmonkey.
You can change the Makefile to point towards a different kernel source and module directory. This is handy for me, since I prefer to compile kernel and modules on my desktop machine, not my Muramasa.
`make install' copies the file to the appropriate /lib/modules/2.6.x.x-x/extra directory, executes `depmod -a' and adds `alias rausb0 rt2570' to /etc/modprobe.conf (perhaps better to use /etc/modprobe.conf.local).