Appendix H. 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 15 and Table 16.
Table 15. Service Reference Code Field Layout
Source Code Reason Code
Byte 0 Byte 1 Byte 2 Byte 3
S1 S2 S3 S4 S5 R1 R2 R3
Table 16. Service Reference Code Field Descriptions
Field Description
S1 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
S2 Base class
S3-S4 Sub-class
S5 Unique version of the device/FRU type for a particular product.
R1 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
© Copyright IBM Corp. 1999, 2000
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