SPARC: How to Find the PROM Release for a System
Display a system's PROM release level with the banner
Sun Ultra 5/10 UPA/PCI (UltraSPARC-IIi 333MHz), No Keyboard
OpenBoot 3.15, 128 MB memory installed, Serial #nnnnnnnn.
Ethernet address 8:0:20:a5:d1:3b, Host ID: nnnnnnnn.
Hardware configuration information, including the release number of
the PROM, is displayed. The PROM release level is indicated by the ROM Rev.