Typical Boot Sequence - IBM RS/6000 44P 270 Service Manual

Typical Boot Sequence

After the ac power is turned on, the System Support Controller (SSC) startup begins the
service processor. If the SSC cannot communicate with the service processor, the LCD
displays 4BA00000. If the service processor is not present, the LCD displays
4BA00001.
1. Service processor self-test
v Service processor card performs self-test and NVRAM initialization.
v LCD code range is E000 - E07F.
v LCD code is OK when complete.
2. Service processor in standby mode
v You can enter the service processor menus whenever the LCD code is OK,
3. Built-In-Self-Test (BIST)
v The service processor initiates built-in-self-test (BIST) on the central electronics
v The VPD data are read and the CRC is checked.
v The processor compatibility test is run.
v LCD code range is E0A0 - E0E1.
4. System Initialization
v System firmware begins to execute and initializes system registers after LCD
v LCD code range is E1XX - E2XX.
5. Memory Test
v The system firmware tests the system memory and identifies failing memory
v LCD code range is E3XX.
6. Device Configuration and Test
v System firmware checks to see which devices are in the system and performs a
v The system firmware displays the device name or device icon being tested. After
v The user can also enter one of the following:
v IPL Boot Code
v Boot Image Execution
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Service Guide
STBY, or has an eight-digit error code on the LCD display, by pressing the Enter
key on an ASCII terminal connected to serial port 1.
complex (CEC) chips when the Power button is pressed.
code E0E1.
cards and memory module locations.
simple test on them.
the keyboard name or icon appears, the user can enter the System Management
Services menu by pressing the 1 key (if ASCII terminal) or the F1 key (if graphics
terminal).
– 5 or F5 to start the standalone diagnostics (CD).
– 6 or F6 to start the online diagnostics (disk drive).
– The system firmware attempts to boot from the devices listed in the boot list.
– LCD code range is E1XX.