Under Linux operating systems use the dmidecode command to check system BIOS information. The output from the dmidecode command include the BIOS version, Bios release date, BIOS vendor, BIOS language and other BIOS characteristics available on the system.
Type the following command as root

# dmidecode --type bios

Output

SMBIOS 2.4 present.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: Phoenix Technologies LTD
        Version: 6.00
        Release Date: 10/13/2009
        Address: 0xEA2E0
        Runtime Size: 89376 bytes
        ROM Size: 64 kB
        Characteristics:
                ISA is supported
                PCI is supported
                PC Card (PCMCIA) is supported
                PNP is supported
                APM is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                ESCD support is available
                USB legacy is supported
                Smart battery is supported
                BIOS boot specification is supported
                Targeted content distribution is supported
        BIOS Revision: 4.6
        Firmware Revision: 0.0

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Dmidecode reports information about your system’s hardware as described in your system BIOS according to the SMBIOS/DMI standard (see a sample output). This information typically includes system manufacturer, model name, serial number, BIOS version, asset tag as well as a lot of other details of varying level of interest and reliability depending on the manufacturer. This will often include usage status for the CPU sockets, expansion slots (e.g. AGP, PCI, ISA) and memory module slots, and the list of I/O ports (e.g. serial, parallel, USB).
The command example below show the use of dmidecode command to display motherboard information or baseboard information.

[root@lifelinux ~]# dmidecode --type baseboard

Sample outputs:

# dmidecode 2.10
SMBIOS 2.6 present.

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
	Manufacturer: Supermicro
	Product Name: X8SIE
	Version: 0123456789
	Serial Number: 0123456789
	Asset Tag: To Be Filled By O.E.M.
	Features:
		Board is a hosting board
		Board is replaceable
	Location In Chassis: To Be Filled By O.E.M.
	Chassis Handle: 0x0003
	Type: Motherboard
	Contained Object Handles: 0

Handle 0x0047, DMI type 41, 11 bytes
Onboard Device
	Reference Designation: To Be Filled By O.E.M.
	Type: Video
	Status: Enabled
	Type Instance: 0

Handle 0x0048, DMI type 41, 11 bytes
Onboard Device
	Reference Designation: To Be Filled By O.E.M.
	Type: SCSI Controller
	Status: Disabled
	Type Instance: 0

Get more infomation using dmidecode command. Type the following command:

[root@lifelinux ~]# dmidecode --type

Output:

dmidecode: option `--type' requires an argument
Type number or keyword expected
Valid type keywords are:
  bios
  system
  baseboard
  chassis
  processor
  memory
  cache
  connector
  slot

Example, get processor information. Type the following command:

[root@lifelinux ~]# dmidecode --type processor

Sample outputs:

# dmidecode 2.10
SMBIOS 2.6 present.

Handle 0x0004, DMI type 4, 42 bytes
Processor Information
	Socket Designation: CPU
	Type: Central Processor
	Family: Xeon
	Manufacturer: Intel            
	ID: E5 06 01 00 FF FB EB BF
	Signature: Type 0, Family 6, Model 30, Stepping 5
	Flags:
		FPU (Floating-point unit on-chip)
		VME (Virtual mode extension)
		DE (Debugging extension)
		PSE (Page size extension)
		TSC (Time stamp counter)
		MSR (Model specific registers)
		PAE (Physical address extension)
		MCE (Machine check exception)
		CX8 (CMPXCHG8 instruction supported)
		APIC (On-chip APIC hardware supported)
		SEP (Fast system call)
		MTRR (Memory type range registers)
		PGE (Page global enable)
		MCA (Machine check architecture)
		CMOV (Conditional move instruction supported)
		PAT (Page attribute table)
		PSE-36 (36-bit page size extension)
		CLFSH (CLFLUSH instruction supported)
		DS (Debug store)
		ACPI (ACPI supported)
		MMX (MMX technology supported)
		FXSR (Fast floating-point save and restore)
		SSE (Streaming SIMD extensions)
		SSE2 (Streaming SIMD extensions 2)
		SS (Self-snoop)
		HTT (Hyper-threading technology)
		TM (Thermal monitor supported)
		PBE (Pending break enabled)
	Version: Intel(R) Xeon(R) CPU           X3440  @ 2.53GHz     
	Voltage: Unknown
	External Clock: 133 MHz
	Max Speed: 2533 MHz
	Current Speed: 2533 MHz
	Status: Populated, Enabled
	Upgrade: Other
	L1 Cache Handle: 0x0005
	L2 Cache Handle: 0x0006
	L3 Cache Handle: 0x0007
	Serial Number: To Be Filled By O.E.M.
	Asset Tag: To Be Filled By O.E.M.
	Part Number: To Be Filled By O.E.M.
	Core Count: 4
	Core Enabled: 4
	Thread Count: 8
	Characteristics:
		64-bit capable

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