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Intel Intel NetStructure MPCHC5525 System Master Processor Board IPMI Reference Driver, MPCHC5525 2.2.2 Communication between Chassis

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16 Intel® NetStructure™ MPCHC5525 System Master Processor Board IPMI Reference Dri ver User’s Guide

IBMU Functionality

2.2.1.3 On-Board Temperature Sensor

To read out the actual temperature value from the on-board sensor, the procedure is as follows:

1. The system management software sends the IPMI command “Get Sensor Reading” to the

BMC, the BMC reads the value from the on-board sensor and sends it to the s ystem

management software.

2. The system management software compares the read value with a threshold value.

3. If the temperature is too high, the system management sof tware can, for example, initiate a

switch board or an alarm module to switch off the board by deactivating the BD_SEL# signal.

2.2.2 Communication between Chassis

Communication between several chassis is p ossible wit h the I CMB, which i s an R S-485-ba sed bus.

It connects the BMCs of two or more chassis. You can connect up to 42 chassis, according to the

ICMB Specification v1.0 Rev. 1.2. Refer to this specification for information on maximum cable

length.

The chassis are connected via the CPU boards ’ RTBs. The ICMB connector is typically located on

the RTB’s front pane l. S ee t he Intel® Ne tStructure™ MPRTM4808 Technical Product Spe cific ation

for further reference.

Figure 7. Example for Nonintelligent Devices

Figure 8. Example: On-Board Sensor

Contents

Main Page Contents Figures Tables Page Page Intel NetStructure MPCHC5525 System Master Processor Board IPMI Reference Driver Users Guide 7 Using This Guid e Using This Guide 1 1.1 Terms and Definitions Table 1. Terms and Definitions 8Intel Using This Guide 1.2 Other Sources of Information Table 2. Reference Documents Table 1. Terms and Definitions IBMU Functionality 2 2.1 Introduction 2.1.1 Purpose of IPMI 2.1.3 Where Is IPMI-Relevant Information Stored? 2.1.4 Basic Communication Principles 2.1.5 Requirements Page 2.1.6 Available D rivers 2.2 How Does Communication Work? 2.2.1 Communication Within a Chassis 2.2.1.1 Devices with IPMI Controller 2.2.1.2 Nonintelligent Devices 2.2.1.3 On-Board Temperature Sensor 2.2.2 Communication between Chassis Page Page Preparing Software for IPMI Usage 3 3.1 Action Plan 3.2 Notes on Writing Your Own IPMI Driver 3.3 Sensor Data Records 3.3.1 Obtaining SDR Settings 3.4 Notes on Writing System Managem ent Software With your management sof tw a re and For c e -sp e cif ic O E M IP MI co mm ands, you: 3.4.2 Checking CP U Boar d Si gn als 3.4.2.4 POST Code 3.4.3 Monitoring the IBMU 3.4.3.1 Self Test 3.4.3.2 IPMI Controller Watchdog Supported IPMI Commands and BMC/PM Addresses 4 4.1 Standard IPMI Commands 4.2 Global IPM I Co m mands 4.2.1 System Interface Commands 4.2.3 SEL Commands 4.2.4 SDR Commands 4.2.5 FRU Inventory Device Commands Intel NetStructure MPCHC5525 System Master Processor Board IPMI Reference Driver Users Guide 25 4.2.6 Sensor Device Commands All commands can be used in every operation mode. 4.2.7 ICMB Bridge Commands Table 7. Implemented Optional Sensor Device Commands Table 8. Implemented Optional ICMB Bridge Commands (Sheet 1 of 2) 4.3 Force-Specific Commands 4.3.1 BMC/PMChangeRole 4.3.1.2 Response Data 4.3.1.1 Request Data 4.3.2 FlashFileSystemClear 4.3.2.1 Request Data 4.3.2.2 Response Data 4.3.3 GetGeographicalAddress 4.3.3.1 Request Data 4.3.3.2 Response Data 4.4 BMC and PM Addresses Intel NetStructure MPCHC5525 System Master Processor Board IPMI Reference Driver Users Guide 29 Page Customer Support 5