Sun Microsystems, Inc.   Sun System Handbook - ISO 3.4 June 2011 Internal/Partner Edition
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Power-On Self Test

Power-On Self Test (POST) is a diagnostic that performs hardware tests at power-on. When POST runs in Diagnostic mode, output is sent to Serial Port A. Frame buffer output occurs during memory initialization after POST has completed. Answer Books, Service Manuals, and Owners Guides provide system specific details on how to use POST and the available options.

Normal Mode runs when:

The NVRAM parameter diag-switch? is set to false.
The NVRAM parameter diag-level is set to off.
The front panel keyswitch is in the Normal or Secure position.
Diagnostic Mode runs when:
The NVRAM parameter diag-switch? is set to true.
The NVRAM parameter diag-level is set to min, med, or max.
The front panel keyswitch is in the Diagnostic position.
DEMON and Extended Modes is initialized after POST when:
The s key (Stop after POST) is depressed after power-on.
The m key (Menus) is depressed after power-on.

DEMON is available on the SS1000(E) and SC2000(E).
Extended POST is available on the E3x00-E6x00.
OBDiag in interactive mode is initialized from OBP when:
The forth word obdiag is entered at the ok prompt.
The forth words obdiag obtest are entered at the ok prompt.
The NVRAM parameter diag-level is set to menus.

OBDiag is available on the Ultra 5, Ultra 10, Ultra 30, Ultra 60, Ultra 80, Enterprise 250, and Ultra Enterprise 450.
OBDiag runs automatically on the E250/E450 after POST when:
The NVRAM parameter diag-switch? is set to true.
The NVRAM parameter diag-level is set to min, med, or max.
The front panel keyswitch is in the Diagnostic position.
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