OpenRD-client booting NetBSD-current

[Matt Thomas <matt%3am-software.com@localhost>]

I've actually had this box a long time but it's been on loan but that
person never did anything with it so I reclaimed it.

I figured I'd just boot a SHEEVEPLUG_INSTALL and it would running.
Alas, it wasn't that easy.  after tftp'ing a uboot image with gzip'd
netbsd, it would just act flakey with random faults return control
to u-boot.

Turns out the default boot address 0x80000 was in memory u-boot was
using and u-boot overwrote something it needed.  So I moved the
boot address to 0x800000 (8MB) and it still flaked.  So I thought
let's not try a gzip'ed kernel image but a normal image.  And that
worked fine.  

I've checkin the config file(s) I used.

A dmesg is at http://3am-software.com/dmesg/openrd.txt for the
install kernel.