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Document Identifier: DSP0134
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Date: 2017-01-12
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Version: 3.1.1
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System Management BIOS (SMBIOS) Reference
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Specification
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Supersedes: 3.1.0
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Document Class: Normative
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Document Status: Published
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Document Language: en-US
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System Management BIOS (SMBIOS) Reference Specification DSP0134
2 Published Version 3.1.1
Copyright Notice
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Copyright © 1996 - 2002, 2004, 2006, 2008 – 2012, 2015 – 2017
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Distributed Management Task Force, Inc. (DMTF). All rights reserved.
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DMTF is a not-for-profit association of industry members dedicated to promoting enterprise and systems
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management and interoperability. Members and non-members may reproduce DMTF specifications and
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documents, provided that correct attribution is given. As DMTF specifications may be revised from time to
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time, the particular version and release date should always be noted.
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Implementation of certain elements of this standard or proposed standard may be subject to third party
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patent rights, including provisional patent rights (herein "patent rights"). DMTF makes no representations
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to users of the standard as to the existence of such rights, and is not responsible to recognize, disclose,
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or identify any or all such third party patent right, owners or claimants, nor for any incomplete or
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inaccurate identification or disclosure of such rights, owners or claimants. DMTF shall have no liability to
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any party, in any manner or circumstance, under any legal theory whatsoever, for failure to recognize,
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disclose, or identify any such third party patent rights, or for such party’s reliance on the standard or
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incorporation thereof in its product, protocols or testing procedures. DMTF shall have no liability to any
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party implementing such standard, whether such implementation is foreseeable or not, nor to any patent
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owner or claimant, and shall have no liability or responsibility for costs or losses incurred if a standard is
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withdrawn or modified after publication, and shall be indemnified and held harmless by any party
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implementing the standard from any and all claims of infringement by a patent owner for such
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implementations.
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For information about patents held by third-parties which have notified the DMTF that, in their opinion,
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such patent may relate to or impact implementations of DMTF standards, visit
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http://www.dmtf.org/about/policies/disclosures.php.
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This document’s normative language is English. Translation into other languages is permitted.
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DSP0134 System Management BIOS (SMBIOS) Reference Specification
Version 3.1.1 Published 3
CONTENTS
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Foreword ....................................................................................................................................................... 9
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Introduction.................................................................................................................................................. 10
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Document conventions ........................................................................................................................ 10
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Typographical conventions ....................................................................................................... 10
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Document version number conventions ................................................................................... 10
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1 Scope .................................................................................................................................................. 13
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1.1 Supported processor architectures ........................................................................................... 13
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2 Normative references .......................................................................................................................... 13
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3 Terms and definitions .......................................................................................................................... 15
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4 Symbols and abbreviated terms .......................................................................................................... 15
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5 Accessing SMBIOS information .......................................................................................................... 21
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5.1 General ..................................................................................................................................... 21
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5.2 Table convention ....................................................................................................................... 21
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5.2.1 SMBIOS 2.1 (32-bit) Entry Point .................................................................................. 22
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5.2.2 SMBIOS 3.0 (64-bit) Entry Point .................................................................................. 23
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6 SMBIOS structures .............................................................................................................................. 24
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6.1 Structure standards ................................................................................................................... 24
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6.1.1 Structure evolution and usage guidelines .................................................................... 25
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6.1.2 Structure header format ............................................................................................... 26
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6.1.3 Text strings .................................................................................................................. 26
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6.2 Required structures and data ................................................................................................... 27
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6.3 SMBIOS fields and CIM MOF properties .................................................................................. 28
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7 Structure definitions ............................................................................................................................. 29
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7.1 BIOS Information (Type 0) ........................................................................................................ 29
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7.1.1 BIOS Characteristics.................................................................................................... 31
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7.1.2 BIOS Characteristics Extension Bytes......................................................................... 32
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7.2 System Information (Type 1) .................................................................................................... 33
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7.2.1 System — UUID ........................................................................................................... 34
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7.2.2 System — Wake-up Type ............................................................................................ 35
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7.3 Baseboard (or Module) Information (Type 2) ........................................................................... 35
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7.3.1 Baseboard — feature flags .......................................................................................... 36
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7.3.2 Baseboard — Board Type ........................................................................................... 37
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7.4 System Enclosure or Chassis (Type 3) .................................................................................... 37
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7.4.1 System Enclosure or Chassis Types ........................................................................... 39
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7.4.2 System Enclosure or Chassis States........................................................................... 40
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7.4.3 System Enclosure or Chassis Security Status ............................................................ 41
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7.4.4 System Enclosure or Chassis — Contained Elements................................................ 41
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7.5 Processor Information (Type 4) ................................................................................................ 42
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7.5.1 Processor Information — Processor Type ................................................................... 45
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7.5.2 Processor Information — Processor Family ................................................................ 46
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7.5.3 Processor ID field format ............................................................................................. 52
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7.5.4 Processor Information — Voltage ................................................................................ 52
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7.5.5 Processor Information — Processor Upgrade ............................................................. 53
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7.5.6 Processor Information — Core Count.......................................................................... 55
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7.5.7 Processor Information — Core Enabled ...................................................................... 55
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7.5.8 Processor Information — Thread Count ...................................................................... 55
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7.5.9 Processor Characteristics ............................................................................................ 56
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7.6 Memory Controller Information (Type 5, Obsolete) .................................................................. 56
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7.6.1 Memory Controller Error Detecting Method ................................................................. 58
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7.6.2 Memory Controller Error Correcting Capability ............................................................ 58
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7.6.3 Memory Controller Information — Interleave Support ................................................. 58
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System Management BIOS (SMBIOS) Reference Specification DSP0134
4 Published Version 3.1.1
7.6.4 Memory Controller Information — Memory Speeds .................................................... 59
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7.7 Memory Module Information (Type 6, Obsolete) ...................................................................... 59
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7.7.1 Memory Module Information — Memory Types .......................................................... 60
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7.7.2 Memory Module Information — Memory Size ............................................................. 60
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7.7.3 Memory subsystem example ....................................................................................... 61
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7.8 Cache Information (Type 7) ...................................................................................................... 63
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7.8.1 Cache Information — Maximum Cache Size and Installed Size ................................. 65
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7.8.2 Cache Information — SRAM Type .............................................................................. 65
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7.8.3 Cache Information — Error Correction Type ............................................................... 66
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7.8.4 Cache Information — System Cache Type ................................................................. 66
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7.8.5 Cache Information — Associativity .............................................................................. 66
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7.9 Port Connector Information (Type 8) ........................................................................................ 67
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7.9.1 Port Information example ............................................................................................. 68
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7.9.2 Port Information — Connector Types .......................................................................... 68
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7.9.3 Port Types .................................................................................................................... 69
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7.10 System Slots (Type 9)............................................................................................................... 70
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7.10.1 System Slots — Slot Type ........................................................................................... 71
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7.10.2 System Slots — Slot Data Bus Width .......................................................................... 73
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7.10.3 System Slots — Current Usage ................................................................................... 73
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7.10.4 System Slots — Slot Length ........................................................................................ 74
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7.10.5 System Slots — Slot ID ............................................................................................... 74
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7.10.6 Slot Characteristics 1 ................................................................................................... 75
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7.10.7 Slot Characteristics 2 ................................................................................................... 75
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7.10.8 Segment Group Number, Bus Number, Device/Function Number .............................. 75
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7.11 On Board Devices Information (Type 10, Obsolete) ................................................................. 75
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7.11.1 Onboard Device Types ................................................................................................ 76
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7.12 OEM Strings (Type 11) ............................................................................................................. 76
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7.13 System Configuration Options (Type 12).................................................................................. 77
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7.14 BIOS Language Information (Type 13) ..................................................................................... 77
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7.15 Group Associations (Type 14) .................................................................................................. 78
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7.16 System Event Log (Type 15) .................................................................................................... 80
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7.16.1 Supported Event Log Type descriptors ....................................................................... 82
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7.16.2 Indexed I/O Access method ......................................................................................... 82
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7.16.3 Access Method Address — DWORD layout ................................................................ 83
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7.16.4 Event Log organization ................................................................................................ 84
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7.16.5 Log Header format ....................................................................................................... 84
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7.16.6 Log Record format ....................................................................................................... 86
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7.17 Physical Memory Array (Type 16) ............................................................................................ 90
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7.17.1 Memory Array — Location ........................................................................................... 91
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7.17.2 Memory Array — Use .................................................................................................. 92
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7.17.3 Memory Array — Error Correction Types .................................................................... 92
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7.18 Memory Device (Type 17) ........................................................................................................ 93
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7.18.1 Memory Device — Form Factor ................................................................................... 95
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7.18.2 Memory Device — Type .............................................................................................. 95
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7.18.3 Memory Device — Type Detail .................................................................................... 96
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7.18.4 Memory Device — Memory Speed .............................................................................. 97
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7.18.5 Memory Device — Extended Size ............................................................................... 97
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7.19 32-Bit Memory Error Information (Type 18) .............................................................................. 97
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7.19.1 Memory Error — Error Type ........................................................................................ 98
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7.19.2 Memory Error — Error Granularity ............................................................................... 99
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7.19.3 Memory Error — Error Operation ................................................................................ 99
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7.20 Memory Array Mapped Address (Type 19)............................................................................... 99
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7.21 Memory Device Mapped Address (Type 20) .......................................................................... 101
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7.22 Built-in Pointing Device (Type 21) .......................................................................................... 102
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7.22.1 Pointing Device — Type ............................................................................................ 103
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7.22.2 Pointing Device — Interface ...................................................................................... 103
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DSP0134 System Management BIOS (SMBIOS) Reference Specification
Version 3.1.1 Published 5
7.23 Portable Battery (Type 22) ...................................................................................................... 104
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7.23.1 Portable Battery — Device Chemistry ....................................................................... 105
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7.24 System Reset (Type 23) ......................................................................................................... 106
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7.25 Hardware Security (Type 24) .................................................................................................. 107
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7.26 System Power Controls (Type 25) .......................................................................................... 108
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7.26.1 System Power Controls — Calculating the Next Scheduled Power-on Time............ 109
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7.27 Voltage Probe (Type 26) ......................................................................................................... 109
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7.27.1 Voltage Probe — Location and Status....................................................................... 110
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7.28 Cooling Device (Type 27) ....................................................................................................... 110
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7.28.1 Cooling Device — Device Type and Status ............................................................... 111
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7.29 Temperature Probe (Type 28) ................................................................................................ 112
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7.29.1 Temperature Probe — Location and Status .............................................................. 113
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7.30 Electrical Current Probe (Type 29) ......................................................................................... 113
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7.30.1 Current Probe — Location and Status ....................................................................... 114
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7.31 Out-of-Band Remote Access (Type 30) .................................................................................. 115
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7.32 Boot Integrity Services (BIS) Entry Point (Type 31) ............................................................... 116
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7.33 System Boot Information (Type 32) ........................................................................................ 116
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7.33.1 System boot status .................................................................................................... 116
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7.34 64-Bit Memory Error Information (Type 33) ............................................................................ 117
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7.35 Management Device (Type 34) .............................................................................................. 118
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7.35.1 Management Device — Type .................................................................................... 118
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7.35.2 Management Device — Address Type ...................................................................... 119
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7.36 Management Device Component (Type 35) ........................................................................... 119
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7.37 Management Device Threshold Data (Type 36) ..................................................................... 120
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7.38 Memory Channel (Type 37) .................................................................................................... 120
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7.38.1 Memory Channel — Channel Type ........................................................................... 121
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7.39 IPMI Device Information (Type 38) ......................................................................................... 121
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7.39.1 IPMI Device Information — BMC Interface Type ....................................................... 123
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7.40 System Power Supply (Type 39) ............................................................................................ 123
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7.40.1 Power supply characteristics ..................................................................................... 124
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7.41 Additional Information (Type 40) ............................................................................................. 125
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7.41.1 Additional Information Entry format ........................................................................... 126
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7.42 Onboard Devices Extended Information (Type 41) ................................................................ 127
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7.42.1 Reference Designation .............................................................................................. 127
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7.42.2 Onboard Device Types .............................................................................................. 127
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7.42.3 Device Type Instance ................................................................................................ 128
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7.42.4 Segment Group Number, Bus Number, Device/Function Number ............................ 128
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7.43 Management Controller Host Interface (Type 42) .................................................................. 128
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7.43.1 Management Controller Host Interface - Interface Types ......................................... 129
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7.43.2 Management Controller Host Interface - Protocol Types .......................................... 130
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7.44 TPM Device (Type 43) ............................................................................................................ 130
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7.44.1 TPM Device Characteristics ...................................................................................... 131
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7.45 Inactive (Type 126) ................................................................................................................. 131
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7.46 End-of-Table (Type 127) ......................................................................................................... 132
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ANNEX A (informative) Conformance guidelines .................................................................................... 133
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ANNEX B (informative) Using the table convention ................................................................................. 136
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ANNEX C (informative) Change log ......................................................................................................... 137
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Bibliography .............................................................................................................................................. 149
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Tables
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Table 1 – SMBIOS 2.1 (32-bit) Entry Point structure .................................................................................. 22
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Table 2- SMBIOS 3.0 (64-bit) Entry Point structure .................................................................................... 24
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