Sun Microsystems SPARCstation 4, Service Manual

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2-1
C H A P T E R
2
Troubleshooting Overview
This chapter describes the factory-defined boot sequence. It also describes the
different types of SPARCstation 4 and SPARC Xterminal 1 diagnostic firmware and
software tools that are available to you for troubleshooting; the chapter explains how
the tools are related and when to use them.
■
“Factory-Defined Boot Mode” on page 1
■
“After Power Is Switched On” on page 3
■
“Diagnostic Tools and When to Use Them” on page 7
■
“Power-On Self-Test” on page 7
■
“FORTH-Based PROM Diagnostics” on page 8
■
“FORTH Monitor” on page 10
■
“SunDiag System Exerciser” on page 11
2.1 Factory-Defined Boot Mode
The flowcharts in
FIGURE 2-1
and
FIGURE 2-2
outline the various diagnostics during a
factory-defined boot operation under the control of the OpenBoot™ PROM (OBP)
firmware.
The following sections describe the relationship between the various diagnostic
tools, and the role each tool plays during the system’s factory-defined boot
sequence. The descriptions in the following sections assume you are using a
graphics monitor to view test results.
FIGURE 2-1
(POST phase) and
FIGURE 2-2
(OBP phase) depict the flow of OBP
processing control, after power is switched on. Each figure diagrams the possible
paths for processing control, and the switch settings for the factory-defined boot
sequence. By examining the two flowcharts you can see where in the processing
sequence other diagnostic tests are available or are encountered. If you need to run
extended FORTH Diagnostics to take advantage of more extensive tests, see
Appendix D.