EFIBOOTMGR(8)                                                                                                      EFIBOOTMGR(8)



NAME
       efibootmgr - manipulate the EFI Boot Manager

SYNOPSIS
       efibootmgr [ -a ] [ -A ] [ -b XXXX ] [ -B XXXX ] [ -c ] [ -d DISK ] [ -e 1|3|-1 ] [ -E NUM ] [ -g ] [ -H XXXX ] [ -i NAME
       ] [ -l NAME ] [ -L LABEL ] [ -n XXXX ] [ -N ] [ -o XXXX,YYYY,ZZZZ ... ] [ -O ] [ -p PART ] [ -q ] [ -t seconds ] [ -T ] [
       -u ] [ -U XXXX ] [ -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 /proc/efi/vars  on
              2.4 kernels, /sys/firmware/efi/vars on 2.6 kernels).  modprobe efivars should do the trick.

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 (hex)

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

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

       -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

       -H | --acpi_hid XXXX
              set the ACPI HID (used with -i)

       -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")

       -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
              Partition number containing the bootloader (defaults to 1)

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

       --test filename
              Don't write to NVRAM, write to filename.

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

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

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

       -U | --acpi_uid XXXX
              set the ACPI UID (used with -i)

       -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

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

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:

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

              o 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.

              o 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.

              o Timeout - the time in seconds between when the boot manager appears on the screen until  when  it  automatically
                chooses the startup value from BootNext or BootOrder.

              o Five  boot entries (0000 - 0004), along with the active/inactive flag (* means active) and the name displayed 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.  Options 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 (PXE).  Unfortunately, this requires knowing a  lit-
       tle  more information about your system than can be easily found by efibootmgr, so you've got to pass additional informa-
       tion - the ACPI HID and UID values.  These can generally be found by using the EFI Boot Manager (in the EFI  environment)
       to  create  a  network  boot  entry,  then  using  efibootmgr  to  print  it  verbosely.   Here's  one  example: Boot003*
       Acpi(PNP0A03,0)/PCI(5|0)/Mac(00D0B7F9F510) \ ACPI(a0341d0,0)PCI(0,5)MAC(00d0b7f9f510,0) In this case,  the  ACPI  HID  is
       "0A0341d0"  and  the  UID is "0".  For the zx2000 gigE, the HID is "222F" and the UID is "500".  For the rx2000 gigE, the
       HID is "0002" and the UID is "100".  You create the boot entry with: efibootmgr -c -i eth0 -H 222F -U 500 -L netboot

BUGS
       Please direct any bugs, features, patches, etc. to Matt Domsch <Matt_DomschATdell.com>.

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

SEE ALSO
       elilo(1)



                                                         11 August 2005                                            EFIBOOTMGR(8)