Kontron RTM8050 - Manual (Page 21)

Board Features
8 RTM8050
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2.8 Hardware Management Overview
The RTM communicates with the front board using the IPMB-L channel. Kontron Intelligent RTM address on
the IPMB-L is fixed and has a value of 0xA6.
The memory subsystem of the MMC consists of an integrated flash memory to hold the MMC operation code
and integrated RAM for data. The field replacement unit (FRU) inventory information is stored in the
nonvolatile memory on an EEPROM connected via a local I2C interface to the MMC. It is possible to store up to
4 KBytes within the FRU inventory information. Event generation over IPMB-L bus to reach the front board
that forward it to the ShMc ensure that 'post-mortem' logging information is available even if the power of
the RTM is disabled.
The onboard DC voltages and temperature are monitored by the MMC device. The MMC will send an event to
the front board if any of the thresholds are exceeded.
To increase the reliability of the RTM8050 management subsystem, an external watchdog supervisor only for
the MMC is implemented. The MMC must strobe the external watchdog at 500 μsec. intervals to ensure
continuity of operation of the board's management subsystem. If the MMC ceases to strobe the watchdog
supervisor, the watchdog resets the MMC. The watchdog timeout expires after one second if strobes are not
generated. The external watchdog supervisor is not configurable and must not be confused with the IPMI
v1.5 watchdog timer commands. This external watchdog of the MMC is implemented in a separate chip.
2.8.1 Sensor Data Record (SDR)
Every sensor on the RTM is associated with a Sensor Data Record (SDR). Sensor Data Records contain
information about the sensors identification such as sensor type, sensor name, sensor unit. SDR also
contain the configuration of a specific sensor such as threshold/hystheresis, event generation capabilities
that specifies sensor behaviour. Some fields of the sensor SDR are configurable through IPMI v1.5 command
and are set with built-in initial value. Finally one field wich is the sensor owner must reflect the module
addresses that allow a system management software to identify the owner of the SDR when it is scanned from
the front board IPMC and merged within the IPMC Device SDR repository.
From IPMI prespective, the RTM8050 management controller is set up as a satellite management controller
(SMC). It does support sensor devices, and use the IPMI static sensor population feature of IPMI v1.5 to
merge the hot swaped RTM sensor with the front board sensors population. The usual way the SHMC is
informed about an RTM insertion is through the RTM Module Hot Swap sensor and a radial presence line on
the RTM connector. All SDRs can be queried using Device SDR commands to the firmware. Module sensors
that have been implemented are listed below.