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download PDF document: efibootmgr.8.pdf

EFIBOOTMGR(8) FreeBSD System Manager's Manual EFIBOOTMGR(8)
NAME efibootmgr - manipulate the EFI Boot Manager
SYNOPSIS efibootmgr [-v] efibootmgr -a -b bootnum efibootmgr -A -b bootnum efibootmgr -B -b bootnum efibootmgr -c -l loader [-aD] [-b bootnum] [-k kernel] [-L label] [-e env] efibootmgr -E [-d] [-p] efibootmgr -F efibootmgr -f efibootmgr -n -b bootnum efibootmgr -N efibootmgr -o bootorder efibootmgr -t timeout efibootmgr -T efibootmgr -u unix-path
DESCRIPTION The efibootmgr program manipulates how UEFI Boot Managers boot the system. It can create and destroy methods for booting along with activating or deactivating them. It can also change the defined order of boot methods. It can create a temporary boot (BootNext) variable that references a boot method to be tried once upon the next boot.
The UEFI standard defines how hosts may control what is used to bootstrap the system. Each method is encapsulated within a persistent UEFI variable, stored by the UEFI BIOS of the form BootXXXX (where XXXX are uppercase hexadecimal digits). These variables are numbered, each describing where to load the bootstrap program from, and whether or not the method is active (used for booting, otherwise the method will be skipped). The order of these methods is controlled by another variable, BootOrder. The currently booted method is communicated using BootCurrent. A global timeout can also be set.
efibootmgr requires that the kernel module efirt(9) module be present or loaded to get and set these non-volatile variables.
The following options are available:
-a --activate Activate the given bootnum boot entry, or the new entry when used with -c.
-A --deactivate Deactivate the given bootnum boot entry.
-b --bootnum bootnum When creating or modifying an entry, use bootnum as the index. When creating a new entry, fail if it already exists.
-B --delete Delete the given bootnum boot entry.
-c --create variables BootCurrent and BootXXXX. This is the ESP partition used by UEFI to boot the current instance of the system. If -d --device-path is specified, the UEFI device path to the ESP is reported instead. If -p --unix-path is specified, the mount point of the ESP is reported instead.
-f --fw-ui, -F --no-fw-ui Set or clear the request to the system firmware to stop in its user interface on the next boot.
-k --kernel kernel The path to and name of the kernel.
-l --loader loader The path to and name of the loader.
-L --label label An optional description for the method.
-n --bootnext Set bootnum boot entry as the BootNext variable.
-N --delete-bootnext Delete the BootNext optional variable.
-o --bootorder bootorder Set BootOrder variable to the given comma delimited set of bootnums. The numbers are in hex to match BootXXXX, but may omit leading zeros.
-t --set-timeout timeout Set the bootmenu timeout value.
-T --del-timeout Delete the BootTimeout variable.
-u --efidev unix-path Displays the UEFI device path of unix-path.
-v --verbose Display the device path of boot entries in the output.
Examples To display the current Boot related variables in the system:
efibootmgr -v
This will display the optional BootNext (if present), BootCurrent (currently booted method), followed by the optional Timeout value, any BootOrder that may be set, followed finally by all currently defined Boot variables, active or not. The verbose flag, (-v), augments this output with the disk partition uuids, size/offset and device-path of the variable. The flag will also include any unreferenced (by BootOrder) variables.
The efibootmgr program can be used to create new EFI boot variables. The following command may be used to create a new boot method, using the EFI partition mounted under /boot/efi, mark the method active, using the given loader and label the method "FreeBSD-11":
Note newly created boot entries are, by default, created inactive, hence the reason -a flag is specified above so that it will be considered for booting. The active state is denoted by a '*' following the BootXXXX name in the output. They are also inserted into the first position of current BootOrder variable if it exists. They must first be set to active before being considered available to attempt booting from, else they are ignored.
efibootmgr -B -b 0009
Will delete the given boot entry Boot0009.
To set the given boot entry active:
efibootmgr -a -b 0009
To set a given boot entry to be used as the BootNext variable, irrespective of its active state, use:
efibootmgr -n -b 0009
To set the BootOrder for the next reboot use:
efibootmgr -o 0009,0003,...
SEE ALSO efirt(9), efivar(8), gpart(8), uefi(8)
STANDARDS The Unified Extensible Firmware Interface Specification is available from www.uefi.org.
FreeBSD 14.0-RELEASE-p11 February 15, 2023 FreeBSD 14.0-RELEASE-p11