Справочник Пользователя для Intel SE7520JR2

Revision 1.0 

It can take up to one minute to clear a System Event Log based upon other concurrent mBMC 
operations. 

The mBMC maintains a four-byte internal timestamp clock used by the SEL and SDR 
subsystems. This clock is incremented once per second and is read and set using the Get SEL 
Time and Set SEL Time commands, respectively. The Get SDR Time command can also be 
used to read the timestamp clock. These commands are specified in the Intelligent Platform 
Management Interface Specification, Version 1.5. 

The mBMC SEL timestamp is initialized by the BIOS prior to booting to the operating system 
using the IPMI command Set SEL Time. 

After a mBMC reset, the mBMC sets the initial value of the timestamp clock to 0x00000000. It is 
incremented once per second after that. A SEL event containing a timestamp from 0x00000000 
to 0x140000000 has a timestamp value that is relative to mBMC initialization. 

During POST, the BIOS tells the mBMC the current real-time clock (RTC) time via the Set SEL 
Time command. The mBMC maintains this time, incrementing it once per second, until the 
mBMC is reset or until the time is changed via another Set SEL Time command. 

System Management Software is responsible for keeping the mBMC and system time synchronized. 

The mBMC includes built-in Sensor Data Records (SDRs) that provide platform management 
capabilities (sensor types, locations, event generation and access information). The SDR 
Repository is stored in the non-volatile storage area (flash) of the mBMC. The SDR Repository 
is accessible via all channels. This way, out-of-band interfaces can be used to access SDR 
Repository information while the system is down. See Table 25 and Table 26 for additional 
sensor support. 

The mBMC supports 2176 bytes of storage for SDR records The SDR defines the type of 
sensor, thresholds, hysteresis values and event configuration. The mBMC supports up to six 
threshold values for threshold-based full sensor records, and up to 15 events for non threshold-
based full and compact sensor records. The mBMC supports both low-going and high-going sensor 
devices. 

If an Intel Management Module is installed in the server, the mBMC SDRs are not accessible 
and are replaced by the Intel Management Module SDRs. 

The mBMC implements the internal sensor initialization agent functionality specified in the 
Intelligent Platform Management Interface Specification, Version 1.5. When the mBMC is 
initialized, or a system is rebooted, the initialization agent scans the SDR repository and 
configures the mBMC sensors referenced by the SDRs. This includes setting sensor thresholds, 
enabling/disabling sensor event message scanning, and enabling/disabling sensor event 
messages.