Appendix F. Interpreting Firmware Error Codes - IBM RS/6000 44P 270 Service Manual

Appendix F. Interpreting Firmware Error Codes

The error code is an 8-character (4-byte) hexadecimal code produced by firmware to
identify the potential failing function or FRU in a system. The code consists of 5 source
code characters and 3 reason code characters. Individual characters within the error
code have specific field definitions, as defined in the following tables.
Table 6. Service Reference Code Field Layout
Source Code
Byte 0
S1
Table 7. Service Reference Code Field Descriptions
Field
S1
S2
S3-S4
S5
R1
R2 - R3
Byte 1
S2 S3 S4
Description
Maintenance Package Source that produced the error code.
0 Reserved
1 Reserved
2 POST, firmware
3 BIST
4 Service processor, base system controller, etc.
5 Reserved
8 Product-specific service guide, MAPs
9 Reserved
A-F Reserved
Base class
Sub-class
Unique version of the device/FRU type for a particular product.
Device/FRU unique failure reason codes.
1-7 Use in combination with R2, R3 for diagnostic test failure when
maximum isolation was obtained.
8-9 Use in combination with R2, R3 for diagnostic test failure when
maximum isolation was not obtained.
A Log analysis of POST error log
B Log analysis of machine check or checkstop error log
C Reserved
D Diagnostic detected missing resource
E-F Reserved
Device/FRU unique failure reason codes.
Reason Code
Byte 2 Byte 3
S5 R1 R2 R3
315