OK.  I installed the patch and have started another kernel compilation.
We'll see what happens in about <cough> 5 hours.  I really _do_ need to set up
a cross compiler....  ;-)

Thanks!
--jmg

      [maynard wrote: snipped]
> 
> Another idea to investigate:  Maybe I botched the Sun-3X support for
> MACHINE_NEW_NONCONTIG or something.  I tested it on a machine with a
> modest amount of memory, so maybe pmap_page_upload() is busted...
> 
> Anyway, you might try going back to the (old) MACHINE_NONCONTIG
> by patching sys/arch/sun3/include/vmparam3x.h as shown below.
> (Of course, if you do this, UVM is not supported.)
> 

     [patch snipped]