EFIBOOTMGR(8)                                                                                                EFIBOOTMGR(8)

NAME
       efibootmgr - manipulate the EFI Boot Manager

SYNOPSIS
       efibootmgr [ -a ] [ -A ] [ -b XXXX ] [ -r | -y ] [ -B ] [ -c ] [ -d DISK ] [ -D ] [ -e 1|3|-1 ] [ -E NUM ] [ -g ] [
       -i NAME ] [ -l NAME ] [ -L LABEL ] [ -m t|f ] [ -M X ] [ -n XXXX ] [ -N ] [ -o XXXX,YYYY,ZZZZ ... ] [  -O  ]  [  -p
       PART ] [ -q ] [ -t seconds ] [ -T ] [ -u ] [ -v ] [ -V ] [ -w ] [ -@ file ]

DESCRIPTION
       efibootmgr  is  a  userspace application used to modify the Intel Extensible Firmware Interface (EFI) Boot Manager.
       This application can create and destroy boot entries, change the boot order, change the next running  boot  option,
       and more.

       Details on the EFI Boot Manager are available from the EFI Specification, v1.02 or later, available from:
        <URL:http://developer.intel.com>

              Note:   efibootmgr   requires  that  the  kernel  support  access  to  EFI  non-volatile  variables  through
              /sys/firmware/efi/vars or /sys/firmware/efi/efivars/.

OPTIONS
       The following is a list of options accepted by efibootmgr:

       -a | --active
              Sets bootnum active

       -A | --inactive
              Sets bootnum inactive

       -b | --bootnum XXXX
              Modify BootXXXX (hex)

       -B | --delete-bootnum
              Delete bootnum

       -c | --create
              Create new variable bootnum and add to bootorder

       -d | --disk DISK
              The disk containing the loader (defaults to /dev/sda)

       -D | --remove-dups
              Remove duplicated entries from BootOrder

       -e | --edd30 1|3|-1
              Force EDD 1.0 or 3.0 creation variables, or guess.

       -E | --edd-device NUM
              EDD 1.0 device number (defaults to 0x80)

       -g | --gpt
              Force disk with invalid PMBR to be treated as GPT

       -i | --iface NAME
              create a netboot entry for the named interface

       -l | --loader NAME
              Specify a loader (defaults to \\elilo.efi)

       -L | --label LABEL
              Boot manager display label (defaults to "Linux")

       -m | --mirror-below-4G t|f
              Set t if you want to mirror memory below 4GB

       -M | --mirror-above-4G X
              X percentage memory to mirror above 4GB. Floating-point value with up to 2 decimal places is accepted.

       -n | --bootnext XXXX
              Set BootNext to XXXX (hex)

       -N | --delete-bootnext
              Delete BootNext

       -o | --bootorder XXXX,YYYY,ZZZZ
              Explicitly set BootOrder (hex).  Any value from 0 to FFFF is accepted so long as it corresponds to an exist‐
              ing Boot#### variable, and zero padding is not required.

       -O | --delete-bootorder
              Delete BootOrder

       -p | --part PART
              Partition number containing the bootloader (defaults to 1)

       -q | --quiet
              Quiet mode - supresses output.

       -r | --driver
              Operate on Driver#### variables instead of Boot#### variables.

       -t | --timeout seconds
              Boot Manager timeout, in seconds.

       -T | --delete-timeout
              Delete Timeout variable.

       -u | --unicode | --UCS-2
              Handle extra command line arguments as UCS-2 (default is ASCII)

       -v | --verbose
              Verbose mode - prints additional information

       -V | --version
              Just print version string and exit.

       -w | --write-signature
              write unique signature to the MBR if needed

       -y | --sysprep
              Operate on SysPrep#### variables instead of Boot#### variables.

       -@ | --append-binary-args
              append  extra  variable args from file (use - to read from stdin).  Data in file is appended as command line
              arguments to the boot loader command, with no modification to the data, so you can pass any binary  or  text
              data necessary.

EXAMPLES
       1.

   DISPLAYING THE CURRENT SETTINGS (MUST BE ROOT).
       [root@localhost ~]# efibootmgr
       BootCurrent: 0004
       BootNext: 0003
       BootOrder: 0004,0000,0001,0002,0003
       Timeout: 30 seconds
       Boot0000* Diskette Drive(device:0)
       Boot0001* CD-ROM Drive(device:FF)
       Boot0002* Hard Drive(Device:80)/HD(Part1,Sig00112233)
       Boot0003* PXE Boot: MAC(00D0B7C15D91)
       Boot0004* Linux

       This shows:

              • BootCurrent - the boot entry used to start the currently running system

              • BootOrder  - the boot order as would appear in the boot manager.  The boot manager tries to boot the first
                active entry in this list.  If unsuccessful, it tries the next entry, and so on.

              • BootNext - the boot entry which is scheduled to be run on next boot.  This supercedes  BootOrder  for  one
                boot  only,  and  is deleted by the boot manager after first use.  This allows you to change the next boot
                behavior without changing BootOrder.

              • Timeout - the time in seconds between when the boot manager appears on the screen until when it  automati‐
                cally chooses the startup value from BootNext or BootOrder.

              • Five  boot  entries  (0000 - 0004), along with the active/inactive flag (* means active) and the name dis‐
                played on the screen.

       2.

   CREATING A NEW BOOT OPTION
       An OS installer would call efibootmgr -c.  This assumes that /boot/efi is your EFI System Partition, and is mounted
       at  /dev/sda1.  This creates a new boot option, called "Linux", and puts it at the top of the boot order list.  Op‐
       tions may be passed to modify the default behavior.  The default OS Loader is elilo.efi.

       3.

   CHANGING THE BOOT ORDER
       Assuming the configuration in Example #1, efibootmgr -o 3,4 could be called to specify PXE boot first,  then  Linux
       boot.

       4.

   CHANGING THE BOOT ORDER FOR THE NEXT BOOT ONLY
       Assuming  the configuration in Example #1, efibootmgr -n 4 could be called to specify that the Linux entry be taken
       on next boot.

       5.

   DELETING A BOOT OPTION
       Assuming the configuration in Example #1, efibootmgr -b 4 -B could be called to delete entry 4 and remove  it  from
       the BootOrder.

       6.

   CREATING NETWORK BOOT ENTRIES
       A  system  administrator wants to create a boot option to network boot.  You create the boot entry with: efibootmgr
       -c -i eth0 -L netboot [ -l '\filename.efi' ]

BUGS
       Please direct any bugs, features, patches, etc. to Peter Jones: https://github.com/rhinstaller/efibootmgr .

AUTHOR
       This man page was generated by dann frazier <dannf@debian.org> for the Debian GNU/Linux operating system,  but  may
       be used by others.

SEE ALSO
       elilo(1)

                                                      11 January 2012                                        EFIBOOTMGR(8)

efibootmgr version 15
usage: efibootmgr [options]
        -a | --active         sets bootnum active
        -A | --inactive       sets bootnum inactive
        -b | --bootnum XXXX   modify BootXXXX (hex)
        -B | --delete-bootnum delete bootnum
        -c | --create         create new variable bootnum and add to bootorder
        -C | --create-only      create new variable bootnum and do not add to bootorder
        -D | --remove-dups      remove duplicate values from BootOrder
        -d | --disk disk       (defaults to /dev/sda) containing loader
        -r | --driver         Operate on Driver variables, not Boot Variables.
        -e | --edd [1|3|-1]   force EDD 1.0 or 3.0 creation variables, or guess
        -E | --device num      EDD 1.0 device number (defaults to 0x80)
        -g | --gpt            force disk with invalid PMBR to be treated as GPT
        -i | --iface name     create a netboot entry for the named interface
        -l | --loader name     (defaults to "\EFI\debian\grub.efi")
        -L | --label label     Boot manager display label (defaults to "Linux")
        -m | --mirror-below-4G t|f mirror memory below 4GB
        -M | --mirror-above-4G X percentage memory to mirror above 4GB
        -n | --bootnext XXXX   set BootNext to XXXX (hex)
        -N | --delete-bootnext delete BootNext
        -o | --bootorder XXXX,YYYY,ZZZZ,...     explicitly set BootOrder (hex)
        -O | --delete-bootorder delete BootOrder
        -p | --part part        (defaults to 1) containing loader
        -q | --quiet            be quiet
        -t | --timeout seconds  set boot manager timeout waiting for user input.
        -T | --delete-timeout   delete Timeout.
        -u | --unicode | --UCS-2  handle extra args as UCS-2 (default is ASCII)
        -v | --verbose          print additional information
        -V | --version          return version and exit
        -w | --write-signature  write unique sig to MBR if needed
        -y | --sysprep          Operate on SysPrep variables, not Boot Variables.
        -@ | --append-binary-args file  append extra args from file (use "-" for stdin)
        -h | --help             show help/usage