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.
Power-up actions differ, depending on the state of the Power-Up Mode switch
on the console module. The mode switch has three settings: loopback test,
language inquiry, and run. The differences are described below.
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), 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.
Power-Up Mode Switch Set to Test
Use the test position on the H3604 to verify a proper connection between the
CPU and the console terminal. During the test, the firmware toggles between
the active and passive states. Refer to Chapter 5 for instructions on performing
loopback tests.
System Initialization and Acceptance Testing (Normal Operation)
4–1
