Here is the DRM kernel interface man for NetBSD.
http://netbsd.gw.com/cgi-bin/man-cgi...NetBSD-current
http://www.netbsd.org/foundation/rep...007Q1.html#drm
Here is the DRM/DRI status report. All "Y" taged cards should work, other are probably not tested until now.
http://www.netbsd.org/~jmcneill/index.html