System Management BIOS

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Not to be confused with DMI.
System Management BIOS
Current Status Published
Started 1999
Version 2.8.0
Version Date April 2013
Organization Distributed Management Task Force (DMTF)
Related Standards Desktop Management Interface (DMI) and Web-Based Enterprise Management (WBEM)
Domain BIOS management
Abbreviation SMBIOS
Website www.dmtf.org/standards/smbios

In computing, the System Management BIOS (SMBIOS) specification defines data structures (and access methods) that can be used to read information stored in the BIOS of a computer. Circa 1999, it became part of the domain of the Distributed Management Task Force (DMTF). Before this integration, SMBIOS functionality had the name DMIBIOS, since it interacted with Desktop Management Interface (DMI). At approximately the same time Microsoft started to require that OEMs and BIOS vendors support the interface/data-set in order to have Microsoft certification.

The DMTF released the current version of the specification, version 2.8.0, on April 3, 2013.

Structure types[edit]

As of version 2.7.1, the SMBIOS specification defines these structure types:

Type Description
0 BIOS Information
1 System Information
2 Baseboard (or Module) Information
3 System Enclosure or Chassis
4 Processor Information
5 Memory Controller Information (Obsolete)
6 Memory Module Information (Obsolete)
7 Cache Information
8 Port Connector Information
9 System Slots
10 On Board Devices Information
11 OEM Strings
12 System Configuration Options
13 BIOS Language Information
14 Group Associations
15 System Event Log
16 Physical Memory Array
17 Memory Device
18 32-Bit Memory Error Information
19 Memory Array Mapped Address
20 Memory Device Mapped Address
21 Built-in Pointing Device
22 Portable Battery
23 System Reset
24 Hardware Security
25 System Power Controls
26 Voltage Probe
27 Cooling Device
28 Temperature Probe
29 Electrical Current Probe
30 Out-of-Band Remote Access
31 Boot Integrity Services (BIS) Entry Point
32 System Boot Information
33 64-Bit Memory Error Information
34 Management Device
35 Management Device Component
36 Management Device Threshold Data
37 Memory Channel
38 IPMI Device Information
39 System Power Supply
40 Additional Information
41 Onboard Devices Extended Information
42 Management Controller Host Interface
126 Inactive
127 End-of-Table
128–255 Available for system- and OEM- specific information

Accessing SMBIOS data[edit]

From Linux[edit]

The Linux kernel contains an SMBIOS decoder, allowing systems administrators to inspect system hardware configuration and to enable or disable certain workarounds for problems with specific systems, based on the provided SMBIOS information.

The userspace command-line utility dmidecode(8) inspects this data. Information provided by this utility typically includes the system manufacturer, model name, serial number, BIOS version and asset tag, as well as a lot of other details of varying level of interest and reliability what depends on the system manufacturer. The information often includes usage status for the CPU sockets, expansion slots (including AGP, PCI and ISA) and memory module slots, and the list of I/O ports (including serial, parallel and USB).[1][2]

From Microsoft Windows[edit]

Microsoft specifies WMI as the preferred mechanism for accessing SMBIOS information from Microsoft Windows.[3]

On Windows systems that support it (XP and later), some SMBIOS information can be viewed with either the WMIC utility with 'BIOS'/'MEMORYCHIP'/'BASEBOARD' and similar parameters, or by looking in the Windows Registry under HKLM\HARDWARE\DESCRIPTION\System

Various software utilities can retrieve raw SMBIOS data, including smbiosw[4] and SMBIOS Peek.[5]

From UEFI[edit]

In UEFI, the "SmbiosView" shell application can retrieve the SMBIOS data.[6]

See also[edit]

References[edit]

  1. ^ "dmidecode". nongnu.org. Retrieved 2013-10-30. 
  2. ^ Joe Barr (2004-11-29). "dmidecode: What's it good for?". linux.com. Retrieved 2013-10-30. 
  3. ^ SMBIOS Support in Windows, Microsoft paper, updated April 25, 2005
  4. ^ 2/15/2005 9:27 amContributed By: Darwin Sanoy (2005-02-15). "FREE: SMBIOS Utilities for Windows and Command Line". DesktopEngineer.com. Retrieved 2012-05-12. 
  5. ^ wjfrancis (2008-03-27). "SMBIOS Peek - CodeProject". Codeproject.com. Retrieved 2012-05-12. 
  6. ^ "Tianocore / edk2-ShellPkg / [139bad] /Library/UefiShellDebug1CommandsLib/SmbiosView". Sourceforge.net. Retrieved 2014-03-26. 

External links[edit]