efibootmgr -- manipulate the EFI Boot Manager
efibootmgr [-a] [-A] [-b XXXX] [-B XXXX] [-c] [-d DISK] [-e
1|3|-1] [-E NUM] [-l NAME] [-L LABEL] [-n XXXX] [-N] [-o
XXXX,YYYY,ZZZZ ...] [-O] [-p PART] [-q] [-v] [-V]
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:
(link to URL http://developer.intel.com)
Note:
efibootmgr requires that the kernel module efivars be loaded
prior to use. 'modprobe efivars' should do the trick.
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)
-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.
-v | --verbose
Verbose mode - prints additional information
-V | --version
Just print version string and exit.
1.
Displaying the current settings (must be root). [Toc] [Back]
[root@localhost ~]# efibootmgr BootCurrent: 0004 BootNext:
0003 BootOrder: 0004,0000,0001,0002,0003 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 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 [Toc] [Back]
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 [Toc] [Back]
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 [Toc] [Back]
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 [Toc] [Back]
Assuming the configuration in Example #1, efibootmgr -b 4 -B
could be called to delete entry 4 and remove it from the
BootOrder.
Please direct any bugs, features, patches, etc. to Matt Domsch
[email protected].
This man page was generated by dann frazier [email protected] for the
Debian GNU/Linux operating system, but may be used by others.
elilo(1)
EFIBOOTMGR(8)
[ Back ] |
