RadiSys ATCA-4616 Specifications download pdf (Page 105)

Troubleshooting

105

IPMI frame structure and message flow

TherearenoframesinIPMBmessages.Figure 10showsthemessageflowthroughanSCM

pairforIPMBmessages.

Figure 10. IPMI Message Flow

IPMB bus operation

TwoIPMBbuses(IPMB‐AandIPMB‐B)providetheprimarymeansofcommunication

betweenShMCs.TheactiveShMContheSCMisalsotheIPMCfortheSCMFRU,theCOM‐E,

andtheSCMRTM.TheactiveShMCperformsthesameoperationsotherIPMCsdoto

maintaintheirFRUs.Messagessenttoaddress0x82/0x84LUN0areallprocessedbytheIPMC

portionoftheShMCandarenotforwardedtotheShMS.Inaddition,theShMCperformsthe

tasksofarbitration(determiningactive/standbystate)andforwardingmessagesoverthe

serialinterfacetotheShMS.TheShMCisbasically

asupersetoftheIPMC.

Standby ShMSActive ShMS

Active ShMC

Standby ShMC

HSD

DEL

FRU

Table

FRU

Table

Fwd Event

Handler

Event

Handler

Event

Processors

Event

Processors

SEL

Local

SEL

Local

SEL

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RadiSys ATCA-4616 Specifications Page 105