Chapter 2
Troubleshooting Overview
2-7
2.3
Diagnostic Tools and When to Use Them
TABLE 2-3
provides a summary of the available diagnostic tools and describes when
to use each tool.
2.4
Power-On Self-Test
For information about the POST, see Chapter 3.
TABLE 2-3
Diagnostic Tools
Diagnostic Tool
When or Why to Use the Tool
Power-On Self-Test (POST)
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 system board, the NVRAM, or the DSIMMs. See
Section 3.1 “Power-On Self-Test (POST)” on page 3-1.
FORTH Diagnostics
Tests functions such as the Ethernet and SCSI interfaces, system memory, and
the diskette drive controller. You must be at the
ok
prompt (the FORTH
Monitor) to run the FORTH Diagnostics. The FORTH Diagnostics reside in the
boot PROM.
FORTH Monitor
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
OpenBoot Command Reference for more information.
SunDiag System Exerciser
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.
Summary of Contents for SPARCstation 4 110
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