Appendix A. Interpreting Firmware Error Codes - IBM RS/6000 7043 43P Series Service Manual

Appendix A. 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. It 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 A-1 and
Table A-2.
Table A-1. Service Reference Code Field Layout
Source Code
Byte 0 Byte 1
S1 S2 S3
Table A-2 (Page 1 of 2). Service Reference Code Field Descriptions
Field Description
Maintenance Package Source that produced the error code.
0
1
2
3
S1
4
5
8
9
A-F
S2 Base class
S3-S4 Sub-class
S5 Unique version of the device/FRU type for a particular product.
Device/FRU unique failure reason codes.
1-7
8-9
R1
A
B
C
D
E-F
Reason Code
Byte 2
S4 S5
Reserved
Reserved
POST, Firmware
BIST
Service Processor, base system controller, etc.
Reserved
Product specific service guide, MAPs
Reserved
Reserved
Use in combination with R2, R3 for diagnostic test failure when
maximum isolation was obtained.
Use in combination with R2, R3 for diagnostic test failure when
maximum isolation was NOT obtained.
Log analysis of POST error log
Log analysis of machine check or checkstop error log
Reserved
Diagnostic detected missing resource
Reserved
Appendix A. Interpreting Firmware Error Codes
Byte 3
R1 R2 R3
A-1