IBM RS/6000 44P 270 Service Manual page 94

Table 2. Firmware Checkpoints.
Checkpoint
E100
E101
E102
E103
E104
E105
E108
E109
E10A
E10B
E10C
E10D
E10E
E10F
E110
E111
E112
E113
E114
E115
E116
76
Service Guide
Description
Reserved
Video enabled, extended memory test
Firmware restart
Set memory refresh (composite img)
Set memory refresh (recovery block)
Transfer control to operating system
(normal boot).
Run recovery block base memory (test
2K), set stack
Copy CRC verification code to RAM
Turn on cache
Flush cache
Jump to CRC verification code in RAM
Compute composite image CRC
Jump back to ROM
Transfer control to open firmware
Turn off cache. Check if composite
image CRC is valid
Good CRC - jump to composite image
Bad CRC - initialize base memory, stack Go to "MAP 1540: Minimum
Bad CRC - copy uncompressed
recovery block code to RAM
Bad CRC - jump to code in RAM
Bad CRC - turn on cache
Bad CRC - copy recovery block data
section to RAM
Action/ Possible Failing FRU
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
See "Boot Problems/Concerns" on
page 90.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.
Go to "MAP 1540: Minimum
Configuration" on page 50.