Advantech MIC-5332 Bedienungsanleitung PDF herunterladen (Seite 69)

Figure 4.4 Real Time Clock Synchronization Overview

From IPMC’s point of view are two more participants in an ATCA System, which

maintain their own time, because they implement a separate Real-Time-Clock. These

are the Shelf Manager and the on-board payload.

The IPMC firmware has implemented a RTC synchronization feature, which allows

configuring the RTC synchronization between Shelf Manager, IPMC and payload

according to the need of each user.

The IPMC will synchronize the time from Shelf Manager as soon as the ShMC is

ready to communicate with the IPMC. This is done with the help of the “Get SEL Time”

IPMI command.

The IPMC will do a specified number of tries to read out the Shelf Manager time. If not

successful, it will generate an integrity sensor event.

IPMC synchronization with payload needs to be initiated by the payload itself (payload

has to use and issue the “Get/Set SEL Time” IPMI commands). This is done by BIOS

and can be performed by an OS driver via the KCS interface. IPMC is only configured

to accept or not accept these commands from payload.

RTC synchronization with the ShMM is only done during the early initialization of

IPMC. Synchronization with payload is always done later, after the ATCA board

transitioned to M4. Means synchronization from IPMC with Shelf Manager and

payload is basically independent from each other.

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Advantech MIC-5332 Bedienungsanleitung Seite 69