I have a 256M DIMM installed.  I just added a 512M DIMM.  Just after boot,
when the kernel prints the size of memory but before it prints the size
of buffers, I get a panic, which I believe is:

uvm_km_suballoc: unable to allocate space in parent map

Can I do anything about that?  I tried increasing BUFPAGES to 3072 with
no benefit.  I can provide a backtrace etc. but I will have to write every-
thing down by hand.

Meanwhile I will try just the 512M DIMM and see what happens.

Thanks,

-- Derek