Archive:Netbooting Sun Fire 280R
This page contains a few links that were helpful when trying to boot Mantis Broken.
Particularly helpful: 
Squeeze kept hanging when booting, but managed to boot successfully using the wheezy netboot image.
- Need TFTP and RARP server to boot from.
- Map the sunfire box's MAC address to an IP using /etc/ethers
- The sunfire box will look for a file with it's IP as a hex value in TFTP root, so symlink it to a boot image.
- Start up the sunfire box, and wait for
haltbefore disk boot begins.
boot net. The box will reset then attempt to contact the boot server. If all is fine, a bunch of hex will appear in the console, and update as it receives the image.