IBM RS/6000 7043 260, Service Manual

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Typical Boot Sequence for 7043 Model 260
After the A/C power is turned on, the System Support Controller (SSC) startup
begins, and releases reset to 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
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Service processor card performs self test and NVRAM initialization.
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LCD Code range is E000 - E07F.
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LCD code is "OK" when complete.
2. Service processor in standby mode
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You can enter the service processor menus whenever the LCD code is "OK",
"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.
3. Built-In-Self-Test (BIST)
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The service processor initiates Built-In-Self-Test (BIST) on the Central
Electronics Complex (CEC) chips when the POWER Button is pressed.
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The VPD data is read and the CRC is checked.
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The processor compatibility test is run.
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LCD Code range is E0A0 - E0E1.
4. System Initialization
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System firmware begins to execute and initializes system registers after LCD
code E0E1.
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LCD Code range is E1XX - E2XX.
5. Memory Test
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The system firmware tests the system memory and identifies failing memory
cards and memory module locations.
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LCD Code range is E3XX.
6. Device Configuration and Test
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System firmware checks to see what devices are in the system and performs
a simple test on them.
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The system firmware displays the device name or device icon being tested.
After the keyboard name or icon appears, the user can enter the Systems
Management Services menu by hitting the "1" key (if ASCII terminal) or the
"F1" key (if Graphics terminal).
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The user can also enter one of the following:
– "5" or "F5" to start the Stand-alone Diagnostics (CD).
– "6" or "F6" to start the On-line Diagnostics (hard disk).
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Service Guide