Power-On Self-Test
After power is turned on and before the operating system is loaded, the partition does a power-on self-test
(POST). This test performs checks to ensure that the hardware is functioning correctly before the
operating system is loaded. During the POST, a POST screen displays, and POST indicators display on
the virtual terminal. The next section describes the POST indicators and functions that can be accessed
during the POST.
POST Indicators
POST indicators indicate tests that are being performed as the partition is preparing to load the operating
system. The POST indicators are words that display on the virtual terminal. Each time that the firmware
starts another step in the POST, a POST indicator word displays on the console. The POST screen
displays the following words:
Memory
Memory test
Keyboard
Initialize the keyboard and mouse. The time period for pressing a key to access the
System Management Services, or to initiate a service mode boot is now open. See “POST
Keys” for more information.
Network
Self-test on network adapters
SCSI
Adapters are being initialized
Speaker
Sounds an audible tone at the end of POST
POST Keys
The POST keys, if pressed
after
the
keyboard
POST indicator displays and
before
the last POST indicator
(
speaker
) displays, cause the system to start services or boot modes used for configuring the system and
diagnosing problems. The system will beep to remind you to press the POST key (if desired) at the
appropriate time. The keys are described as follows:
1 Key
The numeric 1 key, when pressed during POST, starts the System Management Services (SMS) interface.
5 Key
The numeric 5 key, when pressed during POST, initiates a partition boot in service mode using the default
service mode boot list.
This mode attempts to boot from the first device of each type found in the list. It does not search for other
bootable devices of that type if the first device is not bootable. Instead, it continues to the next device type
in the list. The firmware supports up to five entries in the boot list.
The default boot sequence is:
1. Diskette
2. CD-ROM
3. Hard file
4. Tape drive (if installed)
5. Network
a. Token ring
b. Ethernet
6 Key
The numeric 6 key works like the numeric 5 key, except that firmware uses the customized service mode
boot list, which can be set in the AIX service aids.
Chapter 1. Reference Information
15
Summary of Contents for pSeries 670
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