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Old 09-05-2015, 03:34 AM   #1
Registered: Sep 2010
Location: Algarve
Distribution: Linux Multiboot
Posts: 295

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Detect via Terminal if BIOS can be emulated

On several distros
sudo dmidecode -t0 | grep -Ei "BIOS boot|UEFI"
gives you, if you have UEFI with CSM, the output:
		BIOS boot specification is supported
		UEFI is supported
On ARCH based distros?

"[ -d /sys/firmware/efi ] && echo UEFI || echo BIOS"
-> only shows (it is not enough)

Last edited by alfredo10; 09-05-2015 at 03:41 AM. Reason: Addition
Old 09-05-2015, 07:50 PM   #2
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Registered: Dec 2014
Location: London, England
Distribution: Debian stable (and OpenBSD-current)
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empty@Arch ~ % sudo dmidecode -t0 | grep -Ei "BIOS boot|UEFI"
[sudo] password for empty: 
sudo: dmidecode: command not found
1 empty@Arch ~ % pkgfile dmidecode                                                                                                  :(
empty@Arch ~ % sudo pacman -S dmidecode
resolving dependencies...
looking for conflicting packages...

Package (1)      New Version  Net Change  Download Size

extra/dmidecode  2.12-2         0.16 MiB       0.05 MiB

Total Download Size:   0.05 MiB
Total Installed Size:  0.16 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages ...
 dmidecode-2.12-2-x86_64                                 54.9 KiB   914K/s 00:00 [----------------------------------------------] 100%
(1/1) checking keys in keyring                                                   [----------------------------------------------] 100%
(1/1) checking package integrity                                                 [----------------------------------------------] 100%
(1/1) loading package files                                                      [----------------------------------------------] 100%
(1/1) checking for file conflicts                                                [----------------------------------------------] 100%
(1/1) checking available disk space                                              [----------------------------------------------] 100%
(1/1) installing dmidecode                                                       [----------------------------------------------] 100%
empty@Arch ~ % sudo dmidecode -t0 | grep -Ei "BIOS boot|UEFI"
		BIOS boot specification is supported
		UEFI is supported
EDIT: *All* UEFI machines should support "CSM"/"Legacy" mode, at least according to the official UEFI specification.

Unfortunately, implementations of this standard are highly variable (to put it politely)...

Last edited by Head_on_a_Stick; 09-05-2015 at 08:05 PM.
1 members found this post helpful.
Old 09-07-2015, 03:43 AM   #3
Registered: Sep 2010
Location: Algarve
Distribution: Linux Multiboot
Posts: 295

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Rep: Reputation: 15
Thank you - solved!


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