Troubleshooting Overview 2-5
2
Note – If you are in the Sunmon compatibility mode (prompt is >) type n to
return to the OBP monitor (prompt is ok).
Table 2-1 contains a list of NVRAM parameters and explains their effect on the
power-up sequence. For more detailed information about NVRAM parameters,
see the OpenBoot Command Summary.
Note – At any point during the high-level OBP execution, you can abort the
OBP sequence and access the FORTH Monitor by pressing the Stop and “a”
keys simultaneously.
At the FORTH Monitor prompt, you can direct the system to boot the
operating system from a location that you specify, or you can execute a variety
of additional FORTH-based tests. See the OpenBoot Command Reference for a
complete description of the FORTH Monitor.
Table 2-1 NVRAM Parameters Used During POST and Boot Sequence
NVRAM Parameter Description
selftest-#megs
Default = 1
This parameter determines how many megabytes of
memory to test during high-level OBP testing if diag-
switch? is concurrently set to false. The minimum is
zero; the maximum is the amount actually installed in
the system. The default is a 1-megabyte test.
diag-switch?
Default = false
When set to true, this parameter forces the system to test
automatically all available memory. It also enables
diagnostic message output to serial port A. If a properly
configured terminal or “tip window” is connected,
diagnostic progress can be monitored through this port.
When auto-boot? is set to true and diag-switch? is
set to false, diag-switch? forces the system to boot
from the device and file specified in boot-dev and
boot-file.
auto-boot?
Default = true
If auto-boot? is set to true and diag-switch? is set
to true, the system boots the operating system from the
device and file specified in the diag-device and
diag-file NVRAM parameter fields. When set to
false, this will suppress the boot sequence. The system
halts with the ok prompt.
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