Sun Microsystems SPARCclassic Service Manual page 31

Diagnostic Tools
TABLE 2–3
Diagnostic Tool
Power-On Self-Test (POST)
On-Board Diagnostics
Sundiag System Exerciser
Forth Toolkit
SunDiagnostic Executive
When or Why to Use the Tool
Executes automatically at power-on when Stop-d keys
are pressed or when the diag-switch? parameter is
set to True. The POST code resides in the boot PROM
and is driven by the POK signal from the power
supply. POST tells you if there is a problem with the
main logic board, the NVRAM, or the DSIMMs in the
default bank installed.
Tests functions such as the Ethernet and SCSI
interfaces, system memory, and the diskette drive
controller. (The SCSI and diskette drive controller tests
do not apply to the SPARCclassic X terminal.) You
must be at the ok prompt (the Forth Toolkit) to run
the On-Board Diagnostics. Enter n at the > prompt to
enter the Forth Toolkit. The On-Board Diagnostics
reside in the boot PROM.
Runs under the operating system. It displays real-time
use of the system resources and peripherals. The
Sundiag System Exerciser tells you if your system is
functioning correctly. If Sundiag fails, run the
Power-On Self-Test. If all power-on self-tests pass,
then run the SunDiagnostic Executive to identify the
problem. See the Sundiag User's Guide for more
information. (This test is not applicable to the
SPARCclassic X terminal.)
Allows input to the system at the boot PROM level.
Supports functions such as changing NVRAM
parameters, resetting the system, running diagnostic
tests, displaying system information, and redirecting
input and output. See the Open Boot Command
Reference for more information.
Runs extensive, configurable subsystem tests that are
independent of the operating system. Run the
SunDiagnostic Executive if all tests pass when you run
the POST. Running the SunDiagnostic Executive
allows you to determine which customer replaceable
unit needs to be replaced. See the latest version of
SunDiagnostic Executive User's Guide for the
SPARCstations for more information. (This test is not
applicable to the SPARCclassic X terminal.)
Troubleshooting Overview
17