Openboot Prom Diagnostics; Table 2-2 Autoboot And Diagnostic Switch Settings; Table 2-3 Openboot Prom Diagnostic Tests - Sun Microsystems SPARCstation 20 Service Manual

TABLE 2-2
Autoboot Switch
False
True
True

OpenBoot PROM Diagnostics

On-board diagnostics are executed from the ok prompt. If there is a problem with
the operating system, the system will default to the ok prompt. The ok prompt can
also be accessed by shutting down the operating system.
TABLE 2-3
before each test can be executed. Some of the tests verify the proper operation of the
network controller, while other tests verify the diskette drive system, memory, and
system clock. Appendix E provides a detailed description of each test.
TABLE 2-3
Type of Test Description
Tests the video graphics hardware and
test screen
monitor
Tests the diskette drive response to
test floppy
commands
Tests the system board SCSI interface
test scsi
logic
Performs an internal and external
test net-aui
loopback test on the AUI (Thick)
Ethernet interface
Performs an internal and external
test net-tpe
loopback test on the TPE interface
Performs an internal and external
test net
loopback test on the auto-selected
system Ethernet interface
12 SPARCstation 20 Service Manual • July 1996
Autoboot and Diagnostic Switch Settings
Diagnostic Switch
Either true or false
False
True
describes selected OpenBoot PROM diagnostic tests and what must occur
OpenBoot PROM Diagnostic Tests
Result
ok prompt (OpenBoot PROM commands)
Boot operating system from disk (default)
Boot operating system from network
(default)
Preparation
The diag-switch? NVRAM parameter must
be set to true.
Insert a formatted diskette into the drive.
The diag-switch? NVRAM parameter must
be set to true.
A cable must be connected between the rear
panel AUI Ethernet port and the Ethernet
transceiver.
A cable must be connected between the rear
panel TPE port and a TPE hub. If the tpe-
link-test? parameter is false (disabled), the
external loopback test will appear to pass even
if a cable is not connected.
A cable must be connected between the system
and the Ethernet transceiver or hub.