Sun Microsystems Netra CT 410, Service Manual

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Chapter 4 Troubleshooting the System 4-29
4.7.9 OpenBoot Diagnostics
OpenBoot Diagnostics is an interactive tool that tests various hardware and
peripheral devices. When
obdiag
is typed at the ok prompt in OBP, the menu
shown in
CODE EXAMPLE 4-6
is displayed on the screen.
obdiag
performs root-cause failure analysis on the referenced devices by testing
internal registers, confirming subsystem integrity, and verifying device functionality.
To run
obdiag
:
Caution – Prior to running
obdiag
, do not run any other OBP command that might
change the hardware state of the board. After
obdiag
tests are run, always reset the
system to bring it to a known state.
1. At the ok prompt, enter
obdiag
.
This displays the OBDiag menu as shown in
CODE EXAMPLE 4-6
.
test ttya
test ttyb
Outputs an alphanumeric test
pattern on the system serial
ports: ttya, serial port A; ttyb,
serial port B. A terminal must be connected to the
port being tested to observe the
output.
test
keyboard
Executes the keyboard self-test. Four keyboard LEDs should flash
once and a message is displayed:
Keyboard Present.
test -all
Sequentially test system-
configured devices containing
self-test. Tests are sequentially executed in
device-tree order (viewed with the
show-devs
command).
TABLE 4-7
Selected OpenBoot PROM On-Board Diagnostic Tests (Continued)
Type of Test Description Preparation