Kontron RTM806x - Manual (Page 22)

9 RTM806X
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2.4 HD Hot-Swap Option
Kontron offers the possibility to add two Hot-Swap SAS hard drives on the RTM806X. Those hard drives are
located on the lower part of the RTM806X. The Hotswap infrastructure includes a Hot-Swap LED, Hot-Swap
handle, hard disk presence status and a thermal sensor. All of which are connected to the MMC. They are
managed by the IPMC and presented as a regular managed FRU to management subsystem.
2.5 SFP
The RTM806X has two SFP modules connectors available on the RTM face plate. The SFP module signals come
from the front board 1000Base-KX interface through the zone 3 connector.
2.6 MMC Boot Block
The MMC runs a firmware from its internal 256KB flash. It is programmed by an additional 8K boot block. It
keeps the last two copies of the MMC firmware in a dedicated flash memory. The boot block activates the MMC
image and can rollback a firmware update in case of problems.
2.7 Hardware Management Overview
The RTM communicates with the front board using the IPMB-L channel. Kontron’s 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. Events are sent over the IPMB-L bus to the front board which
then forwards it to the ShMc to ensure that 'post-mortem' logging information is available even if the power
of the RTM is disabled.
The onboard DC voltages and temperatures 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 RTM806X management subsystem, an external watchdog supervisor is
implemented for the MMC. 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.
2.7.1 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’s type, sensor name, sensor unit. SDRs also