net install downloads bootloader program then complains about RARP request?

Hi,

I've got a Sun Fire V210 platform which I'm trying to install OpenBSD 
5.2 sparc64 edition on. As it doesn't have a CDROM drive unlike my Netra 
T105 I am unable to use the "ok>boot cdrom" method of install.


So far I have read through all documentation I could find:

http://www.openbsd.org/51.html#install

http://www.openbsd.org/cgi-bin/man.cgi?query=diskless&apropos=0&sektion=0&manpath=OpenBSD+Current&arch=sparc64&format=html

http://www.openbsd.org/sparc64.html

Even going as far as the NetBSD install incase there was something I had 
missed:

http://www.netbsd.org/docs/network/netboot/rarp.html#linux

http://www.netbsd.org/docs/network/netboot/nfs.html


Basically I have setup the /etc/ethers file and /etc/hosts file 
properly. Am using Debian Squeeze sparc for server; currently I have 
managed to setup Debian and Solaris 10 using Jumpstart so no issues 
there....

The server gets an IP address and downloads the boot file then bombs out 
after a while?

Here is output:

{1} ok boot net bsd.mp
Boot device: /pci@1f,700000/network@2  File and args: bsd.mp
100 Mbps full duplex  Link up
Requesting Internet Address for 0:3:ba:9c:53:55
Requesting Internet Address for 0:3:ba:9c:53:55
Requesting Internet Address for 0:3:ba:9c:53:55
Requesting Internet Address for 0:3:ba:9c:53:55
Requesting Internet Address for 0:3:ba:9c:53:55
Requesting Internet Address for 0:3:ba:9c:53:55
Requesting Internet Address for 0:3:ba:9c:53:55
 >> OpenBSD BOOT 1.4
100 Mbps full duplex  Link up
No response for RARP request


The server logfiles show:

tftpd[1581]: tftpd: trying to get file: C0A80173
tftpd[1581]: tftpd: serving file from /tftpboot


so that's all ok. NFS has been setup for NFS v2/3:

/etc/exports file:

/iso/5.2/sparc64 <local_subnet>(ro,sync,no_subtree_check)

i am able to access this using an NFS client.

In my /tftpboot directory I have these files:

installboot
ofwboot
ofwboot.net

According to my reading there was supposed to be an install.net or 
boot.net fie which I haven't seen anywhere?


Am I using the wrong boot loader file or is it something to do with my 
NFS server?

i ran a tcpdump host <hostname> but didn't see anything other then RARP 
requests....... which were getting served.


Can anyone help me?

Thanks.