About Power-On Self-Test (Post) Diagnostics - Sun Microsystems Enterprise 250 Owner's Manual

About Power-On Self-Test (POST)
Diagnostics
The POST diagnostic code resides in flash PROM on the main logic board. It runs
whenever the system is turned on or when a system reset is issued. POST tests the
following system components:
CPU modules
Memory modules
NVRAM
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 242 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 241. For information about running POST,
see "How to Use POST Diagnostics" on page 219.
218 Sun Enterprise 250 Server Owner's Guide • June 1998