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 cre-
       ate 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 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:

	      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 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)

								  11 August 2005						     EFIBOOTMGR(8)