System Management Interrupt (SMI) Handler - (NF 8500R - Type 8681)

System Management Interrupt (SMI) Handler

System Management Interrupt (SMI) Handler is the means of detecting system errors and logging error messages into the system error log.
It is installed during the POST sequence at check point A9, and is functional thereafter.
SMI Handler detects errors that are generated by system hardware such as CPU, memory and PCI devices.
Any SMI-logged error message has "SMI Hdlr" in the SOURCE field as part of the system error message entry.
Error messages are logged at different levels as system errors are detected.
A single system failure could be the combination of errors, and it will cause multiple unique error messages to be logged in the error log.
For example, a single PCI device failure will cause multiple PCI errors, and it will also cause multiple errors at the PCI Bridge level.
Each of those errors will create an entry in the system error log.
It is very important to retrieve all the SMI error messages (SOURCE = SMI Hdlr), the data in the ERROR CODE and ERROR DATA fields for each message, and the sequence in which the error messages were posted to the system error log.

The following table describes SMI error messages, along with possible failing FRUs or appropriate action to be taken.

SMI Error Message	FRU/Action
Memory UNC ECC	DIMM yy, port A
Error on port A, DIMM yy
Memory UNC ECC	DIMM yy, port B
Error on port B, DIMM yy
Memory SBC ECC	DIMM yy, port A
Error on port A, DIMM yy
Memory SBC ECC	DIMM yy, port B
Error on port B, DIMM yy
UNC on P6	Suspect FRUs in the following order:
Processor Bus A	1. Processors on bus A
	2. Processor daughter board A
	3. Processor controller board
UNC on P6	Suspect FRUs in the following order:
Processor Bus B	1. Processors on bus B
	2. Processor daughter board B
	3. Processor controller board
Error on processor An	Suspect FRUs in the following order:
	1. Run diagnostics on the processors
	2. Processor An
	3. Processor daughter board A
	4. Processor controller board
Error on Processor Bn	Suspect FRUs in the following order:
	1. Processor Bn
	2. Run diagnostics on the processors
	3. Processor daughter board B
	4. Processor controller board
P6 I/O bus UNC error	If message "UNC Error on PCI bus slot x" is also displayed,
	follow the FRU/Action for that message first, then suspect
	FRUs in the following order:
	1. I/O board
	2. Processor controller board
UNC Error on PCI bus M	Suspect FRUs in the following order:
	1. Any PCI adapters on bus M (including I/O Function card or
	System Management Adapter for bus A)
	2. System management adapter cable
	3. I/O board
P6 I/O Bus Hard Failure	Reinstall the device driver for the last PCI adapter installed,
Response (HFR)	then suspect FRUs in the following order:
	1. The last installed PCI adapter
	2. Any other PCI adapter
	3. System Management Adapter
	4. I/O Function card
	5. I/O board
UNC Error on PCI bus slot x	Suspect FRUs in the following order:
	1. PCI adapter in slot x
	2. I/O board
	3. Another adapter on the same PCI bus Address Parity
Error (APE) on PCI bus M	Suspect FRUs in the following order:
	1. Any PCI adapters on bus M (including I/O function card
	or System Management Adapter for bus A)
	2. System management adapter cable
	3. I/O board
SBC error on P6 Process Bus A	Suspect FRUs in the following order:
	1. Run diagnostics on the processors
	2. Any processor on bus A
	3. Processor daughter board A
	4. Processor controller board
SBC error on P6 Process Bus B	Suspect FRUs in the following order:
	1. Run diagnostics on the processors
	2. Any processor on bus B
	3. Processor daughter board B
	4. Processor controller board
SBC error on P6 I/O bus	Suspect FRUs in the following order:
	1. I/O board
	2. Processor controller board
Uncorrectable MCA error	Suspect any processor on bus A and B
	1. Run diagnostics on the processors
Correctable MCA error	Suspect any processor on bus A and B
	1. Run diagnostics on the processors
SBC Memory error has occurred	Suspect any DIMM on memory bus A and B
	1. Run diagnostics on the memory