Sun Microsystems Sun Fire V440 Diagnostics And Troubleshooting Manual page 34

Following the successful execution of POST diagnostics, the OpenBoot firmware
proceeds to run OpenBoot Diagnostics tests. Like the POST diagnostics, OpenBoot
Diagnostics code is firmware-based and resides in the boot PROM.
The Purpose of OpenBoot Diagnostics Tests
OpenBoot Diagnostics tests focus on system I/O and peripheral devices. Any device
in the device tree, regardless of manufacturer, that includes an IEEE 1275-compatible
self-test is included in the suite of OpenBoot Diagnostics tests. On a Sun Fire V440
server, OpenBoot Diagnostics examine the following system components:
I/O interfaces; including USB and serial ports, SCSI and IDE controllers, and
Ethernet interfaces
ALOM card
Keyboard, mouse, and video (when present)
Inter-Integrated Circuit (I
of sensors located on the motherboard, CPU/memory modules, DIMMs, power
supply, and SCSI backplane
Any PCI option card with an IEEE 1275-compatible built-in self-test
The OpenBoot Diagnostics tests run automatically via a script when you start up the
system in diagnostics mode. However, you can also run OpenBoot Diagnostics tests
manually, as explained in the next section.
Like POST diagnostics, OpenBoot Diagnostics tests catch persistent errors. To
disclose intermittent problems, consider running a system exercising tool. See
"About Exercising the System" on page 39.
Controlling OpenBoot Diagnostics Tests
When you restart the system, you can run OpenBoot Diagnostics tests either
interactively from a test menu, or by entering commands directly from the ok
prompt.
Note – You cannot reliably run OpenBoot Diagnostics tests following an operating
system halt, since the halt leaves system memory in an unpredictable state. Best
practice is to reset the system before running these tests.
Most of the same OpenBoot configuration variables you use to control POST (see
TABLE 2-1
OpenBoot Diagnostics testing level—or suppress testing entirely—by appropriately
setting the diag-level variable.
16 Sun Fire V440 Server Diagnostics and Troubleshooting Guide • July 2003
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C) bus components; including thermal and other kinds
) also affect OpenBoot Diagnostics tests. Notably, you can determine