Raspberry Pi questions

[Ian Lepore]

I got my RPi running this morning, more or less.  I used the boot
partition from the latest image at http://www.peach.ne.jp/archives/rpi/
but I'm loading my own custom built kernel and world.  I have a few
questions...

Can I get ubldr to load a kernel using tftp, bootp, etc?  Are there any
docs on ubldr in general?  (Right now I'm skipping ubldr and using
u-boot's DHCP command to load the kernel.)

My RPi comes up with a random ethernet mac address on every boot, but
when I look at the driver code it seems that there should be an address
stored in an eeprom.  Do I have to program that myself?

When I try to use an nfs-mounted root I get "Mounting from
nfs:172.22.42.240:/rpi failed with error 19." but if I mount root from
the sdcard then after it gets to multiuser mode I can manually nfs-mount
the same directory.  Has anybody got an nfs-mounted root working?

-- Ian