RadiSys ATCA-5400 RTM Spezifikationen PDF herunterladen (Seite 77)

Correctable and uncorrectable memory error logging

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]

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RadiSys ATCA-5400 RTM Spezifikationen Seite 77