15
C H A P T E R
3
Power-On Self-Test (POST)
■
“Normal Mode” on page 15
■
“Diagnostic Mode” on page 15
■
“How to Invoke POST at Power On” on page 17
■
“Tests POST Runs” on page 17
■
“Status Lights (LEDs) and Indicators” on page 20
■
“Power-On Self-Test” on page 21
The Power-On Self-Test (POST) diagnostics reside in the OpenBoot PROM located
on the system board. There are two POST modes: Normal and Diagnostic.
Normal Mode
Under normal mode, when the system is turned on, control is sent to the OpenBoot
PROM. Depending on the options set in the OpenBoot PROM, for example if
diag-
switch?
is disabled (set to false) and
auto-boot?
is enabled (set to true), the
operating system will load.
Low level diagnostic testing is not run, but memory will be tested based on the
setting of the
selftest-#megs
parameter in the system’s NVRAM. The default for
selftest-#megs
is 1 (one megabyte). Change this parameter to increase the
amount of memory tested at power on time.
Diagnostic Mode
You need to remove the PCMCIA card from the system to run a full diagnostic mode
test by POST. If there is any PCMCIA card inserted in the system, POST will not run
the following tests:
Summary of Contents for SPARCstation Voyager
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