In some email I received from matthew green, they wrote:
> 
> 
>    
>    Is it meant to follow a symbolic link as the boot-file ?
>    
>    Currently, I can't make this happen (boots fine if the boot file is
>    an executeable).
> 
> nope.  this is because when you run "installboot" it stores
> the block numbers of the boot program along with the bootxx
> program at the start of the disk.

Err, sorry, I meant boot-file as in vmunix (netbsd), the prom env.
var thingy (thought this was obvious :/).

So if I do "ln -s /netbsd.xx /netbsd" and try boot, it'll stop and
whinge about "|netbsd".