Specifications

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Correctable and uncorrectable memory error logging
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5. Asoftware‐maintainedcounterisincrementedwheneveracorrectablememoryerror
SMIoccurs.ItisasinglecounterforcorrectablememoryerrorfromallDIMMs.The
softwarecounterismaintainedbythe BIOSandisclearedwhenthesystemisbooted.
TheSMIonlyoccursifthecorrectableerrorthresholdisreached(thehardware
counter).SomecorrectablememoryerrorswillnottriggerSMIbecausethememory
errorthresholdistheactualtriggerevent.
6. Thesoftwarecounterisincremented.
7. TheBIOSreviewsthe past10correctablememoryerrorevents.Ifall10events
occurredwithinanhour,acorrectablememoryerrorlimitreachedeventislogged
(sensorspecificoffset5)andcorrectablememoryerrorreportingisdisabled.Memory
correctionisstillenabled,butitnolongerreportserrordetection.
8. Ifthesoftwarecounterhasnotreachedthelimit,anormalcorrectablememory error
eventislogged(sensor‐specificoffset0).
Uncorrectable memory error logging
Whenanuncorrectablememoryerrorisdetected,theCPUsignalsaMachineCheck
Exception(MCE)andassertsCATERR#.CATERR#isconnectedtotheGPIO8intheICH10,
whichisconfiguredbytheBIOStogenerateanSMIeventwhenanassertioneventis
detected.TheBIOSSMIhandlerreportsaplatformeventmessagewithsensortype0Ch
(Memory)totheIPMCwhentheuncorrectablememoryerrorisdetected.
Iftheuncorrectableerrorhappensinsuchawaythatitdestroysthecodeand/ordatathat
isusedbytheBIOSSMIhandler,theBIOSitselfmaybeunresponsiveandnotableto
completetheSMIhandlerroutine.
ThefollowingstepsdescribetheprocesstheCPMfollowsforperforminguncorrectable
errorloggingifamemoryerroroccurs:
1. Whenthememorycontrollerdetectsanuncorrectablememoryerror,itsignals
CATERR#.
2. TheCATERR#connectedtotheGPIOattheICHtriggersanSMIinterrupt.
3. WhenaSMI
occurs,theBIOSidentifiesthecauseoftheSMIanddeterminesitis
triggeredbyamemoryerror.
4. TheBIOSservicestheerror.
Note:ThereisnoguaranteetheBIOSwillexecutethecodetocompletionduetothe
natureofanuncorrectablememoryerror.
5. Anuncorrectablememoryerroreventislogged
(sensor‐specificoffset1).
6. Anon‐maskableinterrupt(NMI)issignaled.ItisconfigurabletoassertNMIwhenan
uncorrectablememoryerroroccurs.Thisisthesetupoption:
Advanced>RuntimeErrorLogging>ActiononFatalError=[Continue*/Assert
NMI/Reset]