dmidecode 查詢電腦硬體資訊的工具

除了 lshw 可以查詢電腦硬體資訊外,還有另一個工具可以查詢它就是 「dmidecode」。它的用方似乎和 lshw 的用方大同小異。

dmidecode 工具套件的網站,無聊可以點來看看。

以下是呼叫 man dmidecode 的結果

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 components, as well as other useful pieces of information
such as serial numbers and BIOS revision. 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 evolu‐
tions (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 Interface. 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 dis‐
play 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:

· 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.

· 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".

· 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.

· 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 refer‐
ences are hidden. Mutually exclusive with –dump.

-s, –string KEYWORD
Only display the value of the DMI string identified by KEYWORD. KEYWORD must be a keyword from the follow‐
ing list: 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-ver‐
sion, baseboard-serial-number, baseboard-asset-tag, chassis-manufacturer, chassis-type, chassis-version,
chassis-serial-number, chassis-asset-tag, processor-family, processor-manufacturer, processor-version, pro‐
cessor-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 can‐
not be used more than once, and implies –quiet. Mutually exclusive with –type and –dump.

-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. Mutually exclusive
with –string.

-u, –dump
Do not decode the entries, dump their contents as hexadecimal instead. Note that this is still a text out‐
put, no binary data will be thrown upon you. The strings attached to each entry are displayed as both hexa‐
decimal and ASCII. This option is mainly useful for debugging. Mutually exclusive with –quiet and
–string.

-h, –help
Display usage information and exit

-V, –version
Display the version and exit

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

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 ven‐
dors 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
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:

· dmidecode –type 0 –type 13

· dmidecode –type 0,13

· dmidecode –type bios

· dmidecode –type BIOS

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 February 2007 DMIDECODE(8)

發表迴響

在下方填入你的資料或按右方圖示以社群網站登入:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / 變更 )

Twitter picture

You are commenting using your Twitter account. Log Out / 變更 )

Facebook照片

You are commenting using your Facebook account. Log Out / 變更 )

Google+ photo

You are commenting using your Google+ account. Log Out / 變更 )

連結到 %s