Sun Microsystems 220R How to Use OpenBoot Diagnostics OBDiag, Optional Select a diagnostic level

7.6How to Use OpenBoot Diagnostics (OBDiag)

When you turn on the system power, OBDiag runs automatically if any of the following conditions apply:

4The diag-switch?OpenBoot PROM variable is set to true.

You hold down the keyboard's Stop and D keys as you power on the system. The systems's ok prompt will appear.

In the event of an automatic system reset, POST diagnostics run under the following condition:4

The OpenBoot PROM variable diag-switch?is set to true.

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.

7.6.1What to Do

Note - Perform this procedure with the power on and the keyswitch in the

Power-On/Off position.

1.With the keyswitch in the Power-On/Off position, press the Break key on your alphanumeric terminal keyboard, or enter the Stop-asequence 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.

Three different levels of diagnostic testing are available for OBDiag; see Section 7.7 “How to Set the Diagnostic Level for POST and OBDiag” on page 205.

3.At the ok prompt type:

ok setenv diag-switch? true

diag-switch? = true

Diagnostics and Troubleshooting 195