How can I specify dk0 as the root device (config will not allow it)

[Rob <rob%olg.com@localhost>]

I want to build a kernel that specifies dk0 as the root device and dk1 
as the dump device.  config complains that 'dk' is not a device (and 
technically it isn't since it's a pseudo device).  I figure it should be 
possible since I saw a couple of posts that showed dk0 as the root
device.

How can I do this?

Background:
I'm running NetBSD 5.1

I'm trying to use part of a large raid device as the root partition.

I've got the raid device setup.

disklabel can't handle the device size (6TB) so I can't partition it 
that way.

Another thread suggested a work-around.  Specifically, use raid0d as a 
single partition.  I tried this but the system crashes after printing a 
few dots.  It's not ideal in any event as I want multiple partitions. 
Nonelesless, I tried this several times and each time I had to reboot 
(hard reset), rebuild parity, etc ...

So, I used gpt to partition the disk instead.  I used dkctl to assign 
wedges to the partitions.  Thus I have a raid device with multiple dk 
partitions (wedges).

I can boot a kernel which auto-configures the raid device and the dk 
devices also show up.

If I manually specify root as dk0 and dump as dk1 at bootup, the system 
works fine.

What I can't figure out how to do is build a kernel which uses dk0 as 
the default root device.  When I try, config complains that there is no 
such device (dk).

Thanks