I've cross-built and booted a 2.0 kernel on a Sun 3/50 that supports booting
from hard disks. It includes the rnd option for ssh and bpfilter for tcpdump.
Other than that it is strictly limited to the Sun 3/50. No support for pre-2.0
binaries. NFS client support is also compiled in.

ftp://ftp.rmkhome.com/pub/rmk/NetBSD_2.0/sun3/INSTALL350 (config file)

ftp://ftp.rmkhome.com/pub/rmk/NetBSD_2.0/sun3/netbsd350 (kernel)

Login to the ftp server requires a real login, not "mozilla@" or various
bogus "@home.com" addresses.

-- 
Rick Kelly  rmk@rmkhome.com  www.rmkhome.com