RadiSys ATCA-5400 RTM, Справочник

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5
Components and Subsystems
26
Hardware management
The RTM includes a module management controller (MMC), which enables the RTM to provide
local IPMC functions for self-control and monitoring. The ability to provide these functions
makes the RTM an intelligent FRU. It connects to the CPM’s local IPMB and reports events from
its managed sensors to the CPM, which sends them to the Shelf Manager.
The MMC subsystem on the RTM consists of a ATmega128 microcontroller and non-volatile
(NV) memory. The RTM’s MMC is similar to the MMC used on the Promentum AMCs, and
follows many of the requirements specified in the
PICMG AMC.0 R2.0 Advanced Mezzanine
Card Base Specification . The MMC has the following features:
For information on the IPMI commands the MMC responds to and the sensors it manages, see
Appendix B, IPMI Commands and Managed Sensors, on page 35 .
Hot swap
The RTM can be hot swapped, and functions as the AMC module does during the hot-swap
process. The hot-swap latch status is read by the MMC. Hot swapping means that the RTM can
be removed or inserted without shutting down any other part of the CPM or the platform.
Exception : Do not removing the RTM if the CPM has mounted a root file system on:

The hard disk drive on the RTM

A SAS hard disk drive on the AMC, because the SAS hard disk drive is accessible only
through the RTM SAS/SATA controller

A remote hard disk drive connected by cable to a SAS/SATA connector on the RTM

A remote NFS server accessible only through an SFP port on the RTM
W
ARNING
!
Do not remove the RTM if the CPM is accessing the operating system via the RTM. The
CPM will hang if it loses access to the OS root file system.
See the ATCA-4500 Compute Processing Module Reference for details about hot swapping the
RTM.

Conforms to the “Module Management”
section of the PICMG AMC.0 specification

Sensors and I/O interfaces that can be
configured

A local power input that routes through the
IPMC management power (MP) feed from
the carrier

A single I
2
C management link over Zone 3
IPMB-L pins

Non-volatile storage for FRU records
included inside the microcontroller core

An MMC enable control through the
RTM_ENABLE* pin

A global payload reset to force payload
devices to the reset state

An MMC internal watchdog timer that
provides isolation services and
microcontroller fault recovery

GPIOs for E-Key control

Reads the module handle switch state

An MMC console port interface

A JTAG programming and test interface

A “soft” I
2
C port for inlet and outlet
temperature sensors

Drives the standard ATCA LEDs on the RTM
for hot swap, service, and power