03-04-2015
Googling the NVRAM u2103 error seems to indicate your nvram battery is dead. The portion saying "nvram parameters to default values" backs that up. I'm not sure, but most systems have you start your RAM at slot 0 and increment. It may be that this machine had BIOS settings turning off those first RAM slots, but I'd start by looking for the battery on your motherboard, finding a new one and replacing it, and if you get issues with the RAM, try relocating them to slots 0-2 instead of 5-7.
As for the firmware password, Googling that problem indicates you can create a special boot disk if you have access to ANOTHER Sun Sparc 30 (which I'm guessing you don't) or you can replace the boot prom completely. it's Part #525-1669 and you may be able to find one online somewhere. I have zero experience and would be discouraged if I were in your shoes looking at this problem, sorry. I just did some quick Googling for you and have to deal with a couple older Sun machines at work (and wish I didn't have to... lol)
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RARPD(8) System Manager's Manual RARPD(8)
NAME
rarpd - reverse address resolution protocol daemon
SYNOPSIS
rarpd [-v] [-i interface ]
DESCRIPTION
Rarpd listens on the ethernet for broadcast packets asking for reverse address resolution. These packets are sent by hosts at boot time to
find out their IP address. Rarpd looks up the six octet ethernet number in the ethers map finding a host name. This name is translated to
the IP address of the host by a DNS lookup. The IP address is then sent to the host.
Before rarpd can start its service it first finds out what the IP address and hardware address of the ethernet is.
Warning! Sun diskless workstations assume that the first RARP server that answers is the host they are to boot from. For this to work all
other Sun RARP servers delay their answer if they are not also the requestors boot server. This rarpd does not have this kludge so it will
happily engage the Sun boot server to see who can answer the client first. Unless your host can actually serve a Sun diskless client, it
is better not to list any more hosts in the ethers file than necessary.
OPTIONS
-v Be verbose. Show requests which the daemon is responding to.
-i Bind to the named interface. By default rarpd binds to the default interface for the local system type, if available.
SEE ALSO
ifconfig(8), ethers(5), hosts(5),
AUTHOR
Derrick J. Brashear (shadow@dementia.org)
The man page is mostly from the Minix version, by Kees J. Bot (kjb@cs.vu.nl)
RARPD(8)