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Chapter 10 Isolating Failed Parts 181
● To set OpenBoot configuration variables that accept multiple keywords, separate
keywords with a space:
Note – The test-args variable operates differently from other OpenBoot
configuration variables. It requires a single argument consisting of a comma-
separated list of keywords. For details, see “Controlling OpenBoot Diagnostics
Tests” on page 85.
What Next
Changes to OpenBoot configuration variables usually take effect upon the next
reboot.
Reference for Choosing a Fault Isolation
Tool
This section helps you choose the right tool to isolate a failed part in a Sun Fire V490
system. Consider the following questions when selecting a tool.
1. Have you checked the LEDs?
Certain system components have built-in LEDs that can alert you when that
component requires replacement. For detailed instructions, see “How to Isolate
Faults Using LEDs” on page 172.
2. Does the system have main power?
If there is no main power to the system, standby power from the SC card may
enable you to check the status of some components. See “About Monitoring the
System” on page 101.
3. Does the system boot?
■ If the system cannot boot, you have to run firmware-based diagnostics that do not
depend on the operating system.
■ If the system can boot, you should use a more comprehensive tool. The typical
fault isolation process is illustrated in
FIGURE 10-1.
ok setenv post-trigger power-on-reset error-reset
post-trigger = power-on-reset error-reset