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126 Sun Enterprise 220R Server Owner’s Guide • October 1999
About OpenBoot Diagnostics (OBDiag)
OpenBoot Diagnostics (OBDiag) software resides in flash PROM on the main logic
board. OBDiag can isolate errors in the following system components:
■ Main logic board
■ Diskette drive (if applicable)
■ CD-ROM drive
■ Tape drive
■ Disk drives
■ Any option card that contains an on-board self-test
On the main logic board, OBDiag tests not only the main logic board but also its
interfaces:
■ PCI
■ SCSI
■ TPE Ethernet including MII Ethernet
■ Serial port
■ Parallel port
■ Keyboard/mouse
OBDiag reports some test results via the LEDs located on the system front panel.
See “Error Indications” on page 138 for more information about LEDs and error
messages.
OBDiag displays detailed diagnostic and error messages on a local console or
terminal, if one is attached to the system.
OBDiag tests run automatically under certain conditions. You can also run OBDiag
interactively from the system ok prompt. For information about running OBDiag,
see “How to Use OpenBoot Diagnostics (OBDiag)” on page 129.
When you run OBDiag interactively from the ok prompt, you invoke the OBDiag
menu, which lets you select the tests you want to perform. For information about the
OBDiag menu, see “OBDiag Menu” on page 127.
The system also provides configuration variables that you can set to affect the
operation of the OBDiag tests. For information about the configuration variables, see
“OBDiag Configuration Variable Settings” on page 128.