efibootmgr quick guide

Been working on UEFI/Secure Boot recently.

efibootmgr -v
efibootmgr -O
efibootmgr -O -o XXXX,YYYY,ZZZZ

How to delete an unwanted entry in efibootmgr?

efibootmgr -Bb 0000

# efibootmgr -Bb 0000
BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0002,2001,0001,2002,2003
Boot0001* Debian
Boot0002* rEFInd Boot Manager
Boot2001* EFI USB Device
Boot2002* EFI DVD/CDROM
Boot2003* EFI Network

Deleting a boot entry

efibootmgr -b 2 -B

Creating a boot entry
To create an EFI boot entry, a couple of arguments are passed to efibootmgr:

--create (-c) to create a new entry;
--part (-p) followed by the partition number on which the EFI System Partition is hosted;
--disk (-d) followed by the disk on which the EFI System Partition is hosted;
--label (-L) followed by the label to use as the boot entry;
--loader (-l) followed by the path of the EFI image to boot

#efibootmgr -c -d /dev/sda -p 2 -L "Gentoo" -l "\efi\boot\bootx64.efi"
efibootmgr -c -d /dev/sda -p 1 -L "SHIM" -l "\EFI\BOOT\BOOTX64.EFI"

/File(\EFI\fedora\shimx64.efi)