Sun Microsystems Enterprise 250 Owner's Manual page 282

How to Use OpenBoot Diagnostics
(OBDiag)
When you turn on the system power, OBDiag runs automatically if any of the
following conditions apply:
4 The OpenBoot PROM variable diag-switch? is set to true.
4 You hold down the keyboard's Stop and D keys as you power on the system.
4 You power on the system by turning the front panel keyswitch to the Diagnostics
position.
In the event of an automatic system reset, POST diagnostics run under either of the
following conditions:
4 The diag-switch? variable is set to true and the diag-trigger variable is set
to error-reset or soft-reset.
4 The front panel keyswitch is in the Diagnostics position and the diag-trigger
variable is set to error-reset or soft-reset.
For information about the various keyswitch positions, see "About the Status and
Control Panel" on page 6.
OBDiag tests run automatically, without operator intervention, under the conditions
described above. However, you can also run OBDiag in an interactive mode and
select which tests you want to perform. The following procedure describes how to
run OBDiag interactively from the system ok prompt.
What to Do
Note -
position.
1. With the keyswitch in the Power-on position, press the Break key on your
alphanumeric terminal's keyboard, or enter the Stop-a sequence on a Sun
keyboard.
To enter the Stop-a sequence, press the Stop key and the a key simultaneously.
The ok prompt is displayed.
2. (Optional) Select a diagnostic level.
Four different levels of diagnostic testing are available for OBDiag; see "How to
Set the Diagnostic Level for POST and OBDiag" on page 250.
Sun Enterprise 250 Server Owner's Guide ♦ Revision A, June 1998
248
Perform this procedure with the power on and the keyswitch in the Power-on