One can find out BIOS version under for Linux Box using the dmidecode command which is a great tool to analyse BIOS data.
Dmidecode command helps you to find out the BIOS version without rebooting the server.
root@server [~]# dmidecode --type 0
# dmidecode 2.11 SMBIOS 2.6 present. Handle 0x0000, DMI type 0, 24 bytes BIOS Information Vendor: Dell Inc. Version: 1.3.8 Release Date: 02/26/2010 Address: 0xF0000 Runtime Size: 64 kB ROM Size: 4096 kB Characteristics: ISA is supported PCI is supported PNP is supported BIOS is upgradeable BIOS shadowing is allowed Boot from CD is supported Selectable boot is supported EDD is supported Japanese floppy for Toshiba 1.2 MB is supported (int 13h) 5.25"/360 kB floppy services are supported (int 13h) 5.25"/1.2 MB floppy services are supported (int 13h) 3.5"/720 kB floppy services are supported (int 13h) 8042 keyboard services are supported (int 9h) Serial services are supported (int 14h) CGA/mono video services are supported (int 10h) ACPI is supported USB legacy is supported BIOS boot specification is supported Function key-initiated network boot is supported Targeted content distribution is supported BIOS Revision: 1.3
root@server [~]# dmidecode -s bios-version 1.3.8