netbsd-7 LOONGSON kernel doesn't work

[Jared McNeill <jmcneill%invisible.ca@localhost>]

I found my old Lemote Yeeloong netbook today and thought I'd try netbsd-7 
on it. Not much luck:

  http://www.netbsd.org/~jmcneill/loongson/IMG_20141223_184630.jpg

Two issues:

  1- Not sure why it's using wd0 for boot device, since it's the
     INSTALL_LOONGSON kernel.
  2- The panic.

Last kernel I had on this was quite old -- 6.99.7 -- so not sure what has 
changed since then.

Here are the kernels I tried:

http://nyftp.netbsd.org/pub/NetBSD-daily/netbsd-7/201412221730Z/evbmips-mips64el/installation/netbsd-INSTALL_LOONGSON.gz
http://nyftp.netbsd.org/pub/NetBSD-daily/netbsd-7/201412221730Z/evbmips-mips64el/binary/kernel/netbsd-LOONGSON.gz

Any hints?

Jared