With many thanks to Andrew Gillham, who sent me a boot program which
loads netbsd, my SLC now comes up... It gets about this far:

	bwtwo0 at sbus0 slot 3 offset 0x0: SUNW,501-1455, 1152x900 (console)
	nfs_boot: using network interface 'le0'
	nfs_boot: client_addr=0xc081541a
	nfs_boot: server_addr=0xc0815411
	nfs_boot: hostname=slc2
	RPC timeout for server 0xc0815411

The last message repeats ad nauseum.

I get lots of messages like
	20:06:23.004620 slc2.1023 > taniemarie.739: udp 76 (ttl 64, id 23)
from tcpdump.

I don't know what RPC it's looking for.  NFS is up (apparently), bootparamd
is running, etc.

I got a couple of:
20:05:02.004213 slc2.1023 > taniemarie.sunrpc: udp 76 (ttl 64, id 2)
20:05:02.006653 taniemarie.sunrpc > slc2.1023: udp 28 (ttl 64, id 2544)

but then they stopped.

*sigh*.

Thanks again for all the help; this is a lot easier than it would have
been otherwise.

-s