Chapter 4 Sequence of Events at Power Up 4-3
Note – If a system is not working, check the cooling fans first to see if the system
shut down is due to a defective fan.
4.2 Reset Cautions
Review these cautions before proceeding.
Caution – Under certain conditions a soft reset (from the command line) may leave
the system in an unknown state, indicated by a ”Wait-for-reset-timeout error”
message at the “OK” prompt. To correct this condition, power cycle the system.
Probe PCIB slot J2003
Probe PCIA, SCSI device. HDD activity light illuminates
momentarily.
Probe PCIA slot J2101
Probe PCIA slot J2102
Probe PCIA slot J2103
Probe floppy disk drive. FDD activity light illuminates
momentarily.
At OBP Prompt User Control OBP Prompt appears ok
boot command
entered
PROM loads bootblock (bootblk) program Boot messages appear.
Bootblook program loads boot (usfboot) program
The boot (usfboot) program loads the kernel
The kernel initializes itself, loads all boot device
drivers, modules and starts init process
The init process starts the run control scripts Boot process takes about 3 minute
Console login
TABLE 4-1 Power Up Sequence (Continued)
Phase Description Observation
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