How To Use Post Diagnostics - Sun Microsystems Enterprise 250 Owner's Manual

4 CPU modules
4 Memory modules
4 NVRAM
4 Main logic board
POST reports its test results via LEDs located on the system keyboard and on the
system front panel. See "Error Indications" on page 257 for more information about
LEDs and error messages.
POST displays detailed diagnostic and error messages on a local terminal, if one is
attached to the system's serial port A. You can also choose to display POST output
remotely on a Remote System Control (RSC) console.
The System Service Processor (SSP) runs its own POST diagnostics, separate from the
main POST diagnostics. To view detailed diagnostic and error messages from SSP
POST, you must attach a local terminal to the SSP (RSC) serial port prior to running
SSP POST.
For more information about RSC and the System Service Processor, see "About
Remote System Control (RSC)" on page 256. For information about running POST,
see "How to Use POST Diagnostics" on page 236.

How to Use POST Diagnostics

When you turn on the system power, POST diagnostics run automatically if any of
the following conditions apply:
4 The OpenBoot PROM variable diag-switch? is set to true when you power on
the system.
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.
Sun Enterprise 250 Server Owner's Guide ♦ Revision A, June 1998
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