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X11R7.4 - man page for dmidecode (x11r4 section 8)

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DMIDECODE(8)									     DMIDECODE(8)

NAME
       dmidecode - DMI table decoder

SYNOPSIS
       dmidecode [OPTIONS]

DESCRIPTION
       dmidecode  is  a  tool  for dumping a computer's DMI (some say SMBIOS) table contents in a
       human-readable format. This table contains a description of the system's  hardware  compo-
       nents, as well as other useful pieces of information such as serial numbers and BIOS revi-
       sion. Thanks to this table, you can retrieve this information without having to probe  for
       the  actual  hardware.	While this is a good point in terms of report speed and safeness,
       this also makes the presented information possibly unreliable.

       The DMI table doesn't only describe what the system is currently  made  of,  it	also  can
       report the possible evolutions (such as the fastest supported CPU or the maximal amount of
       memory supported).

       SMBIOS stands for System Management BIOS, while DMI stands for Desktop  Management  Inter-
       face.  Both  standards  are  tightly related and developed by the DMTF (Desktop Management
       Task Force).

       As you run it, dmidecode will try to locate the DMI table. If it succeeds,  it  will  then
       parse this table and display a list of records like this one:

       Handle 0x0002, DMI type 2, 8 bytes.  Base Board Information
	       Manufacturer: Intel
	       Product Name: C440GX+
	       Version: 727281-001
	       Serial Number: INCY92700942

       Each record has:

       o A handle. This is a unique identifier, which allows records to reference each other. For
	 example, processor records usually reference cache memory records using their handles.

       o A type. The SMBIOS specification defines different types of elements a computer  can  be
	 made  of.  In	this  example,	the type is 2, which means that the record contains "Base
	 Board Information".

       o A size. Each record has a 4-byte header (2 for the handle, 1 for the  type,  1  for  the
	 size),  the  rest  is used by the record data. This value doesn't take text strings into
	 account (these are placed at the end of the record), so the actual length of the  record
	 may be (and is often) greater than the displayed value.

       o Decoded values. The information presented of course depends on the type of record. Here,
	 we learn about the board's manufacturer, model, version and serial number.

OPTIONS
       -d, --dev-mem FILE
	      Read memory from device FILE (default: /dev/mem)

       -q, --quiet
	      Be less verbose. Unknown, inactive and  OEM-specific  entries  are  not  displayed.
	      Meta-data and handle references are hidden.

       -s, --string KEYWORD
	      Only  display the value of the DMI string identified by KEYWORD.	KEYWORD must be a
	      keyword from the following list: bios-vendor, bios-version, bios-release-date, sys-
	      tem-manufacturer,  system-product-name,  system-version, system-serial-number, sys-
	      tem-uuid, baseboard-manufacturer, baseboard-product-name, baseboard-version,  base-
	      board-serial-number, baseboard-asset-tag, chassis-manufacturer, chassis-type, chas-
	      sis-version, chassis-serial-number, chassis-asset-tag, processor-family, processor-
	      manufacturer,  processor-version, processor-frequency.  Each keyword corresponds to
	      a given DMI type and a given offset within this entry type.  Not all strings may be
	      meaningful  or  even defined on all systems. Some keywords may return more than one
	      result on some systems (e.g.  processor-version on a multi-processor  system).   If
	      KEYWORD  is  not provided or not valid, a list of all valid keywords is printed and
	      dmidecode exits with an error.  This option cannot be used more than once.

       -t, --type TYPE
	      Only display the entries of type TYPE. TYPE can be either a DMI type number,  or	a
	      comma-separated  list  of type numbers, or a keyword from the following list: bios,
	      system, baseboard, chassis, processor, memory, cache, connector, slot. Refer to the
	      DMI  TYPES  section  below for details.  If this option is used more than once, the
	      set of displayed entries will be the union of all the given types.  If TYPE is  not
	      provided	or not valid, a list of all valid keywords is printed and dmidecode exits
	      with an error.

       -u, --dump
	      Do not decode the entries, dump their contents as hexadecimal instead.   Note  that
	      this  is	still  a text output, no binary data will be thrown upon you. The strings
	      attached to each entry are displayed as both hexadecimal and ASCII. This option  is
	      mainly useful for debugging.

	   --dump-bin FILE
	      Do  not decode the entries, instead dump the DMI data to a file in binary form. The
	      generated file is suitable to pass to --from-dump later.

	   --from-dump FILE
	      Read the DMI data from a binary file previously generated using --dump-bin.

       -h, --help
	      Display usage information and exit

       -V, --version
	      Display the version and exit

       Options --string, --type and --dump-bin determine  the  output  format  and  are  mutually
       exclusive.

DMI TYPES
       The SMBIOS specification defines the following DMI types:

       Type   Information
       ----------------------------------------
	  0   BIOS
	  1   System
	  2   Base Board
	  3   Chassis
	  4   Processor
	  5   Memory Controller
	  6   Memory Module
	  7   Cache
	  8   Port Connector
	  9   System Slots
	 10   On Board Devices
	 11   OEM Strings
	 12   System Configuration Options
	 13   BIOS Language
	 14   Group Associations
	 15   System Event Log
	 16   Physical Memory Array

	 17   Memory Device
	 18   32-bit Memory Error
	 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
	 32   System Boot
	 33   64-bit Memory Error
	 34   Management Device
	 35   Management Device Component
	 36   Management Device Threshold Data
	 37   Memory Channel
	 38   IPMI Device
	 39   Power Supply
	 40   Additional Information
	 41   Onboard Device

       Additionally,  type  126  is  used  for	disabled  entries and type 127 is an end-of-table
       marker. Types 128 to 255 are for OEM-specific data.  dmidecode will display these  entries
       by default, but it can only decode them when the vendors have contributed documentation or
       code for them.

       Keywords can be used instead of type numbers with --type.  Each keyword is equivalent to a
       list of type numbers:

       Keyword	   Types
       ------------------------------
       bios	   0, 13
       system	   1, 12, 15, 23, 32
       baseboard   2, 10, 41
       chassis	   3
       processor   4
       memory	   5, 6, 16, 17
       cache	   7
       connector   8
       slot	   9

       Keywords are matched case-insensitively. The following command lines are equivalent:

       o dmidecode --type 0 --type 13

       o dmidecode --type 0,13

       o dmidecode --type bios

       o dmidecode --type BIOS

BINARY DUMP FILE FORMAT
       The  binary dump files generated by --dump-bin and read using --from-dump are formatted as
       follows:

       o The SMBIOS or DMI entry point is located at offset 0x00.  It is crafted to hard-code the
	 table address at offset 0x20.

       o The DMI table is located at offset 0x20.

FILES
       /dev/mem

BUGS
       More  often than not, information contained in the DMI tables is inaccurate, incomplete or
       simply wrong.

AUTHORS
       Alan Cox, Jean Delvare

SEE ALSO
       biosdecode(8), mem(4), ownership(8), vpddecode(8)

dmidecode				  November 2008 			     DMIDECODE(8)
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