Power-On Self-Test; Post Overview - Sun Microsystems Sun Ultra 60 Service Manual

3
CHAPTER

Power-On Self-Test

This chapter describes how to initiate power-on self-test (POST) diagnostics.
This chapter contains the following topics:
4 Section 3.1 "POST Overview" on page 3-1
4 Section 3.2 "Pre-POST Preparation" on page 3-2
4 Section 3.3 "Initializing POST" on page 3-4
4 Section 3.4 "Maximum and Minimum Levels of POST" on page 3-6
4 Section 3.4.3 "POST Progress and Error Reporting" on page 3-17
4 Section 3.5 "Bypassing POST" on page 3-19
4 Section 3.6 "Additional Keyboard Control Commands" on page 3-20
4 Section 3.7 "System and Keyboard LEDs" on page 3-20
4 Section 3.8 "Initializing Motherboard POST" on page 3-20
3.1

POST Overview

POST is useful in determining if a portion of the system unit has failed and should be
replaced. POST detects approximately 95 percent of system unit faults and is located
in the system board OpenBoot
the diag-switch? and the diag-level flag, determine if POST is executed. Table
3–1 lists the diag-switch? and diag-level flag settings for disabling POST (off),
enabling POST maximum (max), or enabling POST minimum (min).
TM
PROM (OBP). The setting of two NVRAM variables,
3-1