Simon Burge writes:

 > Not entirely true.  If you have kernfs, you can do something like (from
 > memory):
 > 
 > 	mount -t kernfs /kern /kern
 > 	mount -u /kern/rootdev /
 > 
 > or thereabouts...

That's handy, /kern/console anyone? :-)

As an aside, I always get worried about aliasing (and locking,
permission) problems when there's more than one path to the "same"
device.  /kern (or a putative devfs) might allow something smarter.

--
Dan.