User`s guide

4
System Initialization and Acceptance
Testing (Normal Operation)
This chapter describes the system initialization, testing, and bootstrap
processes that occur at power-up. In addition, the acceptance test procedure to
be performed when installing a system or whenever adding or replacing FRUs
is described.
4.1 Basic Initialization Flow
On power-up, the firmware identifies the console device, optionally performs a
language inquiry, and runs the diagnostics.
The firmware waits for power to stabilize by monitoring SCR<15>(POK).
Once power is stable, the firmware verifies that the console battery
backup RAM (BBU RAM) is valid (backup battery is charged) by checking
SSCCR<31>(BLO). If it is invalid or zero (battery is discharged), the BBU
RAM is initialized.
After the battery check, the firmware tries to determine the type of terminal
attached to the console serial line. It uses this information to determine if
multinational support is appropriate.
The console uses the saved console language if the contents of the BBU RAM
are valid.
If the firmware detects that the contents of the BBU RAM are invalid, the
firmware prompts you for the language to be used for displaying the following
system messages (if the console terminal supports the multinational character
set):
System Initialization and Acceptance Testing (Normal Operation) 4–1