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Power-On Self-Test
發表于：2007-06-08來源：作者：點擊數：
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InitializingPOST POSTcanbeinitializedintwoways: nBysettingthediag-switch?totrueandthediag-leveltomaxormin,followedbypower-cyclingthesystemBysimultaneouslypressingthekeyboardStopandDkeyswhilepowerisapplied tothesystemTosetthediag-switch?tot
Initializing POST
POST can be initialized in two ways:
n By setting the diag-switch? to true and the diag-level to max or min, followed by power-cycling the system By simultaneously pressing the keyboard Stop and D keys while power is applied
to the system To set the diag-switch? to true and power-cycle the system:
1. At the system prompt, type:
ok% setenv diag-switch? true
When the POST is complete, type the following at the system prompt:
ok% setenv diag-switch? false
Maximum and Minimum POST Levels
Two levels of POST are available: maximum (max) level and minimum (min) level.
The system initiates the selected level of POST based upon the setting of
diag-level, an NVRAM variable. The default setting for diag-level is max.
To set the diag-level variable to min before power-cycling the system, type:
ok% setenv diag-level min
To return to the default setting:
ok% setenv diag-level max
Resetting Variables to Default Settings To set the system NVRAM parameters to the original default settings:
1. Press and hold the Stop and N keys while powering on the system.
2. Continue to hold the Stop and N keys until the system banner displays on the monitor.
