Chapter 4. Checkpoints
Checkpoints display on the primary I/O drawer operator panel while the system is
powering on and going through the initial program load (IPL). This chapter explains the
IPL flow of the system and provides a table that lists checkpoints that you might see in
the primary I/O drawer operator panel.
IPL Flow
The IPL process starts when ac power is connected to the system. The IPL process
has four phases:
v Phase 1: Service Processor Initialization
Phase 1 starts when ac power is connected to the system and ends when OK is
displayed in the primary I/O drawer operator panel. 8xxx checkpoints are displayed
during this phase. Several 9xxx codes may also be displayed. Service processor
menus are available at the end of this phase by pressing any key on the console
keyboard.
v Phase 2: Hardware Initialization by the Service Processor
Phase 2 starts when system power up is initiated by pressing the power on button on
the primary I/O drawer operator panel. 9xxx checkpoints are displayed during this
time. 91FF, the last checkpoint in this phase, indicates the transition to Phase 3 is
taking place.
v Phase 3: System Firmware initialization
At phase 3, a system processor takes over control and continues initializing system
resources. During this phase, checkpoints in the form Exxx are displayed. E105, the
last checkpoint in this phase, indicates that control is being passed to the AIX boot
program. Location codes may also be displayed in the second line of the primary I/O
drawer operator panel.
v Phase 4: AIX Boot
When AIX starts to boot, checkpoints in the form 0xxx and 2xxx are displayed.
Location codes may also be displayed in the second line of the primary I/O drawer
operator panel. This phase ends when the AIX login prompt displays on the AIX
console. The primary I/O drawer operator panel should be blank.
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