Linux dmidecode command details

I. Introduction to dmidecode

Dmidecode allows you to obtain hardware information in Linux. Dmidecode complies with the SMBIOS/DMI standard. The output information includes BIOS, system, motherboard, processor, memory, cache, and so on.

DMI is a Management system that helps collect computer system information. DMI information must be collected in strict compliance with SMBIOS specifications. System Management BIOS (SMBIOS) is a unified specification for the motherboard or System manufacturer to display product Management information in a standard format. SMBIOS and DMI are open technical standards drafted by the industry-leading organization Desktop Management Task Force (DMTF), where DMI design applies to any platform and operating system.

DMI acts as an interface between the management tool and the system layer. It has established a standard manageable system to make it easier for computer vendors and users to understand the system. The main component of DMI is the Management Information Format (MIF) database. This database contains all information about computer systems and accessories. DMI allows you to obtain the serial number, computer vendor, serial port information, and other system accessories.

Dmidecode: Obtain hardware information in Linux

Dmidecode output format is generally as follows:

Handle 0x0002, DMI type 2, 95 bytes.

Base Board Information

Manufacturer: IBM

Product Name: Node1 Processor Card

Version: Not Specified

Serial Number: Not Specified

The first three lines are called recode headers, including:

1. recode id (Handle): record identifier in the DMI table, which is unique. For example, Handle 0x0002 in the preceding example.

2. DMI type id: record type, for example, BIOS and Memory. The preceding example is type 2, that is, "Base Board Information ".

3. recode size: the size of the corresponding record in the DMI table. The preceding example is 95 bytes. (Excluding text information, all actual output content is larger than this size ). After the record header is the record value.

4. recoded values: the record value can be multiple rows. For example, the previous example shows the Manufacturer, Product Name, Version, and Serial Number of the motherboard.

Ii. Role of dmidecode

Dmidecode decodes the information in the DMI database and displays it in readable text. Because DMI information can be manually modified, the information in it is not necessarily accurate information of the system.

Iii. dmidecode command usage

Running dmidecode without option usually outputs all hardware information. Dmidecode has a very useful option-t, which can specify the type of output information. To obtain information about the processor, run the following command:

Dmidecode-t processor

Usage: dmidecode [OPTIONS]

Options are:

-D :( default:/dev/mem) reads information from the device file, and the output content is the same as the standard output without parameters.

-H: displays help information.

-S: only information of the specified DMI string is displayed. (String)

-T: displays only the information of a specified entry. (Type)

-U: displays undecoded original entries.

-- Dump-bin FILE: Dump the DMI data to a binary file.

-- From-dump FILE: Read the DMI data from a binary file.

-V: displays version information.

Iv. dmidecode parameter string and type list

(1) Valid string keywords are:

Bios-vendor

Bios-version

Bios-release-date

System-manufacturer

System-product-name

System-version

System-serial-number

System-uuid

Baseboard-manufacturer

Baseboard-product-name

Baseboard-version

Baseboard-serial-number

Baseboard-asset-tag

Chassis-manufacturer

Chassis-type

Chassis-version

Chassis-serial-number

Chassis-asset-tag

Processor-family

Processor-manufacturer

Processor-version

Processor-frequency

(2) Valid type keywords are:

Bios

System

Baseboard

Chassis

Processor

Memory

Cache

Connector

Slot

(3) list of all types

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

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