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.
137
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