Provided by: efibootmgr_0.5.1-1ubuntu1_i386 bug

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 ]

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

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 automatically chooses the
                startup value from BootNext or BootOrder.

              · 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 little more  information
       about your system than can be easily found by efibootmgr, so you’ve got
       to pass additional information - 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_Domsch@dell.com>.

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)

                               06 February 2004                  EFIBOOTMGR(8)