Oracle Sun Netra T5440, Service Manual, Page: 32 / 162

1.5 Running POST
32 Sun Netra T5440 Server • September 2015
clear_fault_action = (none)
Commands:
cd
show
1.5 Running POST
Power-on self-test (POST) is a group of PROM-based tests that run when the server is powered
on or reset. POST checks the basic integrity of the critical hardware components in the server
(CPU, memory, and I/O buses).
If POST detects a faulty component, the component is disabled automatically, preventing faulty
hardware from potentially harming any software. If the system is capable of running without the
disabled component, the system will boot when POST is complete. For example, if one of the
processor cores is deemed faulty by POST, the core will be disabled, and the system will boot
and run using the remaining cores.
1.5.1 Controlling How POST Runs
The server can be configured for normal, extensive, or no POST execution. You can also
control the level of tests that run, the amount of POST output that is displayed, and which reset
events trigger POST by using ALOM CMT CLI variables.
Table 1-7 lists the ALOM CMT CLI variables used to configure POST. Figure 1-8 shows how
the variables work together.
Note - Use the ALOM CMT CLI
setsc
command to set all the parameters in Table 1-7 except
setkeyswitch
.
TABLE 1-7
ALOM CMT CLI Parameters Used for POST Configuration
Parameter Values Description
setkeyswitch
normal
The system can power on and run POST (based on the other
parameter settings). For details see Figure 1-8 . This parameter
overrides all other commands.
diag
The system runs POST based on predetermined settings.
stby
The system cannot power on.
locked
The system can power on and run POST, but no flash updates
can be made.
diag_mode
off
POST does not run.
normal
Runs POST according to
diag_level
value.