Kontron RTM8242 - Manual (Page 21)

8 RTM8242
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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.
The onboard voltages and temperatures are monitored by the MMC. The MMC will send an event to the front
board if any of the thresholds are exceeded. These and other events are sent over the IPMB-L bus to the front
board's IPMC which forwards them to the SHMC. This ensures that 'post-mortem' logging information is
available even if the power of the RTM is disabled.
To increase the reliability of the RTM8242 management subsystem, an external watchdog supervisor for the
MMC is implemented. If the MMC ceases to service the watchdog supervisor, the watchdog resets the MMC.
The external watchdog supervisor is not configurable and must not be confused with the IPMI watchdog timer
commands.
2.5.1 Sensor Data Record (SDR)
Every sensor on the RTM is associated with a Sensor Data Record (SDR). Sensor Data Records contain
information about the sensor’s identification such as sensor type, sensor name and sensor unit. The SDR also
contains the configuration of a specific sensor such as threshold/hysteresis and event generation
capabilities that specify sensor behaviour. Some fields of the SDR are configurable through IPMI command
and are set with built-in initial values. Finally, the sensor owner field must reflect the module addresses that
allows 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 an IPMI perspective, the RTM8242 management controller is set up as a satellite management
controller (SMC). It supports sensor devices, and uses the IPMI static sensor population feature of IPMI to
merge the hot swapped RTM sensor with the front board sensors population. The SHMC is informed about an
RTM insertion 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. Module sensors that have been implemented are listed
below.
2.5.2 Hardware Sensors
Table 2-4:IPMI Hardware Sensors
IPMI
sensor
ID Sensor Name Description (Sensor Type, Event trigger) Scanning En-
abled under
Power State Health LED
(Green to Am-
ber)
0 IPMI Info-1 Internal Management Controller firmware diagnostic * N
1 IPMI Info-2 Internal Management Controller firmware diagnostic * N
2 FRU Agent FRU Information Agent - FRU0 Data Error Detection * N
3 Module HS Hot Swap state * N
4 IPMBL State IPMB-L branch from FRU0 fault detection sensor * N
5 MMC Stor Err Management sub-system health: non volatile memory error * N
6 MMC Reboot IPMC reboot detection * N
7 IPMC VChange IPMC Version Change Detection * N