Machine Checks/Interrupts; Cpu Correctable Errors (Scb: 630); Cpu Uncorrectable Error (Scb: 670) - Compaq ES40CSLP Installation, User & Service Manual

6.7.4 Machine Checks/Interrupts

The exceptions that result from hardware system errors are called machine checks/interrupts.
They occur when a system error is detected during the processing of a data request.
During the error-handling process, errors are first handled by the appropriate PALcode error
routine and then by the associated operating system error handler. PALcode transfers control to
the operating system through the system control block (SCB) vector. The SCB vectors pertain
to Tru64 UNIX and OpenVMS systems only.
The following types of machine checks/interrupts are related to system events.
•
CPU Correctable Error (630)
•
CPU Uncorrectable Error (670)
•
System Correctable Error (620)
•
System Uncorrectable Error (660)
•
System Environmental Error (680)

6.7.4.1 CPU Correctable Errors (SCB: 630)

CPU correctable errors are generic Alpha 21264 microprocessor correctable errors. The
following EV6-detected conditions cause PALcode to invoke the operating system 630 error
handler:
Error Code
(Hex)
86
9E
86
86
86
86

6.7.4.2 CPU Uncorrectable Error (SCB: 670)

CPU uncorrectable errors are fatal microprocessor machine check errors that result in a system
crash. The error conditions are:
Error Code
(Hex)
8E
90
98
98
98
98
98
98
Machine Check
Type Error Description
Correctable B-cache probe hit single-bit ECC error
Correctable D-cache tag parity error on issue
Correctable I-cache tag or data parity error
Correctable D-cache victim single-bit ECC error
Correctable B-cache single-bit ECC fill error to I-stream or D-stream
Correctable Memory single-bit ECC fill error to I-stream or D-stream
Machine Check
Type Error Description
CPU uncorrect PAL detected bugcheck error
CPU uncorrect Operating system detected bugcheck error
CPU uncorrect EV6 detected second D-cache store EEC error
CPU uncorrect EV6 detected D-cache tag parity error in pipeline 0 or 1
CPU uncorrect EV6 detected duplicate d-cache tag parity error
CPU uncorrect EV6 detected double-bit ECC memory fill error
CPU uncorrect EV6 detected double-bit probe hit EEC error
CPU uncorrect EV6 detected B-cache tag parity error
Compaq ES40CSLP Rackmount System Installation/User/Service Guide 6–53
Troubleshooting and Diagnostics