Max And Min Levels Of Post - Sun Microsystems Ultra 1 Series Service Manual

ok setenv diag-switch? true
Turn the power off, wait a few seconds, and then press the power on switch. This
action causes the system to start running the POST diagnostics. While POST is
running, you should see the Caps Lock key on the keyboard flashing on and off.
When you have finished testing the system using POST, set the diag-switch?
variable back to false (the system"s default setting).
ok setenv diag-switch? false

Max and Min Levels of POST

Two levels of POST are available in the system: max (maximum level) and min
(minimum level). The system runs the selected level of POST based on the setting of
the NVRAM variable called diag-level.
The default setting for diag-level is max. In this mode, POST takes about one
minute to run and will send progress and error messages to the system serial port A.
For an example of max POST output on serial port A, see "Diag-level NVRAM
Variable is Set to Max" on page 12."
When the diag-level variable is set to min, POST takes about 30 seconds to run
and only an abbreviated set of messages and error information are sent to serial port
A. For an example of min POST output on serial port A, see "Diag-level NVRAM
Variable is Set to Min" on page 16."
To set the diag-level variable to min, at the system"s ok prompt type:
ok setenv diag-level min
To return to the default setting:
ok setenv diag-level max
To observe POST messages on serial port A, you must connect a terminal to port A
or set up a tip connection to another workstation. For information about setting up
tip connections, refer to the Solaris software reference manuals.
Sun Ultra 1 Series Service Manual ♦ Revision A, November 1995
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