Specifications

6
Troubleshooting
108
TheusercandotoseveralthingsrespondtoapersistentIPMBisolationissuewhenthereisa
shelfwideIPMBisolationalarmthatisalwaysreportedbytheactiveSCM.Performthe
followingsteps:
1. ReadtheIPMBsensor(sensor0x1100)ontheactiveSCM.Ifthereadingis0xF8or0x8F
thenitindicatesthattheSCMisdetectinganexternalfaultonthebus.Thismeansthat
someotherIPMConthebusiscausingtheIPMBissue.An0xF8or0x8Freadingalso
indicatesthatonlyoneIPMBisdown.0xFFwouldindicatethatbothIPMBsaredown.
2. Read
theIPMBsensoronalltheboardsaswell.Thereadingwillprovideda taonwhatis
causingtheIPMBisolation.RefertothePICMGspecificationforinformationonwhatthe
IPMBsensorreadingmeans.Again,readinga'8'inonlyoneofthenibblesintheIPMB‐0
sensorreadingindicatesthattheFRUiscommunicatingonjustonebuswhileitisisolated
fromtheother.Areadingof0x88indicatesthattheFRUiscommunicatingonbothIPMBs
andtherearenoissues.
3. IfonlyoneIPMBisdown(asreportedfromIPMB‐0sensorreadingsinsteps1and2)try
isolatingboardsinthechassis,onebyone,fromthatIPMB,asfollows:
a. ThiscanbedoneviaHPIusing theIPMBcontrolsoneachboard'sResource.These
controlsarenumbered0x1101forIPMB‐Aand0x1102forIPMB‐B.IftheIPMB‐0
sensorontheactiveSCMreads0x8FthenIPMB‐Aisdownandifitreads0xF8then
IPMB‐Bisdown.Toforce‐isolateaboardoffIPMB‐Ayouneedtousecontrol0x1101
ontheResourceforthatboard(e.g.Resource0xA008Cforaboardinslot10).For
IPMB‐B,usecontrol0x1102.
b. ToisolateaboardoffanIPMByoucanalternativelyusethePlatformMgmtCLIas
follows(yourinputisshowninbold):
platform‐mgmt#front<N‐slotnumberofboard>
platform‐mgmt(frontN)##configurecontrol<0x1101/0x1102>
CurrentControlDetails:
ControlType:ANALOG
Analog:0
Enternewvalueforthecontrol:
Value[0]:0
Successfullysetcontrol.
NewlysetControlDetails:
ControlType:ANALOG
Analog:0
platform‐mgmt(frontN)#
AtthispointtheIPMContheboardshouldhaveisolateditselfofftheintendedIPMB.
c. Afterdoingthisforeachboard,waitfor60secondsandchecktoseeiftheIPMB
isolationalarmisgonefromtheactiveSCMbeforemovingontothenextboard.Ifan
IPMC
isconnectedtotheIPMBevenwhenitisinanerrorstatethenforceisolateit
fromthatIPMBtoresolvetheissue.Thisshouldalsohelpidentifytheboardthatis
responsibleforthisissue.ThenrunsomededicatedIPMBstabilitytestswithjustthat
boardandtheSCM‐sinthechassis.