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11
C H A P T E R
Power-On Self-Test
This chapter describes the
(POST). Topics covered are:
Section 11.1, "POST Overview" on page 11-1
Section 11.2, "post Command" on page 11-2
Section 11.3, "POST Output" on page 11-4
Section 11.4, "Analyzing POST Messages" on page 11-14
Section 11.5, "Setting Up for POST" on page 11-16
Section 11.6, "Disabling Diagnostics and Auto Boot" on page 11-20
11.1
POST Overview
Power-on self-test (POST) performs tests on workstation core components such as
CPU and memory. POST checks low-level interaction between the CPU, caches,
memory, JBus, and the I/O bridge chip.
Typing the post command from the ok prompt initiates tests that check the CPU,
I/O bridge chip, and memory modules. The output of the post command is
directed to the serial port of the system under test. An external display device and a
Tip connection are required to view this output. Tip connections are described in
"Configuring an External Display Device" on page 11-17.
11.1.1
Configuring POST Output
The post command uses two variables to determine its output. The command
syntax is:
ok post level verbosity
Sun Ultra 45 and Ultra 25 workstation
power-on self-test
11-1
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