IBM B50 manual Appendix A. Interpreting Firmware Error Codes, Field, Bist

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 server. The error code consists of 5 source code characters and 3 reason code characters, as shown in the following

table.

Source Code					Reason Code
Byte 0		Byte 1		Byte 2		Byte 3
S1	S2	S3	S4	S5	R1	R2	R3

Individual characters within the error code have specific field definitions, as defined in the following table.

Field	Description
	Maintenance Package Source that produced the error code.
	0	Reserved
	1	Reserved
	2	POST, Firmware
S1	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.
	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.
R1	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

Appendix A. Interpreting Firmware Error Codes A-1