Chapter 4. Checkpoints
Checkpoints are displayed on the operator panel when the system is going through
powering on and the initial program load (IPL). This chapter explains the IPL flow of the
system and provides a table that lists checkpoints that you may see during IPL.
IPL Flow
The IPL process starts when the power is turned on. The IPL process is comprised of
four phases as defined below:
v Phase 1: Service Processor Initialization
Represents the time from system power-on (8-digit checkpoints on the operator
panel) to the point that E0xx (4-digit checkpoints on the operator panel) checkpoints
are displayed.
Note: Service processor menus can be accessed at the end of this phase.
v Phase 2: Hardware Initialization by Service Processor
Represents the time between the first 8-digit checkpoint after phase 1 to the point
when the operator panel is first cleared (display is blank).
v Phase 3: System Firmware initialization
Represents the time from the end of phase 2 to the first appearance of 0000 (4-digit
checkpoint on the operator panel). During this phase 4-digit checkpoints of the form
Eyxx are displayed where y is not 0 (zero) and x can be any number in the range
0-F (hexadecimal).
v Phase 4: AIX Boot
Represents the time from the end of phase 3 until the time when the operator panel
is cleared again. AIX login prompt follows shortly thereafter.
© Copyright IBM Corp. 1999, 2000 135
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