Sel Erasure; Timestamp Clock; Sensor Data Record (Sdr) Repository; Initialization Agent - Intel SE7520JR2 Technical Manual

Platform Management
5.3.10.1

SEL Erasure

It can take up to one minute to clear a System Event Log based upon other concurrent mBMC
operations.
5.3.10.2

Timestamp Clock

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.
5.3.11

Sensor Data Record (SDR) Repository

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.
5.3.11.1

Initialization Agent

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.
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Revision 1.0