mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
![Warner Losh](/assets/img/avatar_default.png)
efibootmgr manages the UEFI BootXXXX variables that implement the UEFI Boot Manager protocol defined in the UEFI standards. It is modeled after the Linux program of the same name with a mostly compatible set of command line options. Since there's a fair amount of OS specifioc code due to differeing names and methods of doing things, the compatibility isn't 100%. Basic functionality is implemented, though the more advanced next boot functionality that's been defined elsewhere is unimplemented. Submitted by: Matt Williams (with unix / efi path xlate by me) Sponsored by: Netflix
151 lines
5.2 KiB
Groff
151 lines
5.2 KiB
Groff
.\" Copyright (c) 2017 Netflix, Inc
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd December 8, 2017
|
|
.Dt EFIBOOTMGR 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm efibootmgr
|
|
.Nd manipulate the EFI Boot Manager
|
|
.Sh SYNOPSIS
|
|
.Op Fl aAnNB Ar Bootvar
|
|
.Op Fl t Ar timeout
|
|
.Op Fl T
|
|
.Op Fl o Ar bootorder
|
|
.Op Fl verbose
|
|
.Op Fl c -k Ar kernel -l Ar loader [-L Ar label] [--dry-run]
|
|
.Sh "DESCRIPTION"
|
|
.Nm
|
|
manipulates how UEFI Boot Managers boot the system.
|
|
Methods of booting can be created and destroyed.
|
|
Boot methods can be activated or deactivated.
|
|
The order of boot methods tried can be changed.
|
|
Temporary boot methods can override the usual booting methods.
|
|
.Pp
|
|
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
|
|
.Va BootXXXX .
|
|
These variables are numbered, describe where to load the bootstrap
|
|
program from, and whether or not the method is active.
|
|
The boot order of these methods is controlled by another variable
|
|
.Va BootOrder .
|
|
The currently booting method is communicated using
|
|
.Va BootCurrent .
|
|
A global timeout can also be set.
|
|
.Pp
|
|
.Nm
|
|
requires that the kernel efirt module to get and set these
|
|
non-volatile variables.
|
|
.Pp
|
|
The following options are available:
|
|
.Bl -tag -width 28m
|
|
.It Fl c Fl -create
|
|
Create a new Boot Variable
|
|
.It Fl l -loader Ar loader
|
|
The path to and name of the loader.
|
|
.It Fl k -kernel Ar kernel
|
|
The path to and name of the kernel.
|
|
.It Fl L -label Ar label
|
|
An optional description for the entry.
|
|
.It Fl D -dry-run
|
|
Process but do not set the given BootVar.
|
|
.It Fl B -delete Ar BootVarNum
|
|
Delete the given BootVar Num.
|
|
.It Fl a -activate Ar BootVarNum
|
|
Activate the given BootVarNum.
|
|
.It Fl A -deactivate Ar BootVarNum
|
|
Deactivate the given BootVarNum.
|
|
.It Fl n -bootnext Ar BootVarNum
|
|
Set BootVarNum as the BootNext variable.
|
|
.It Fl N -delete-bootnext
|
|
Delete the BootNext optional BootVar.
|
|
.It Fl o -bootorder Ar bootorder
|
|
Set BootOrder variable to the given comma delimited set of BootVarNums.
|
|
The numbers are in hex to match BootXXXX, but may omit leading zeros.
|
|
.It Fl t -set-timeout Ar timeout
|
|
Set the bootmenu timeout value.
|
|
.It Fl T -del-timeout
|
|
Delete the BootTimeout variable.
|
|
.It Fl v -verbose
|
|
Display the device path of BootVars in the output.
|
|
.El
|
|
.Pp
|
|
.Sh Exammples
|
|
.Pp
|
|
To Display the current Boot related variables in the system:
|
|
.Pp
|
|
.Dl efibootmgr [-v]
|
|
.Pp
|
|
This will display the optional BootNext BootVar, BootCurrent,
|
|
or currently booted BootVar, followed by the optional Timeout value, any
|
|
BootOrder that maybe set, followed finally by all currently defined Boot
|
|
variables, active or not. The verbose flag will augment this output with
|
|
the hardrive partition uuids, size/offset and device-path of the
|
|
variable.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
program can be used to create new EFI boot variables. To create a new
|
|
boot var pointing to an installation on partition 1 of device ada0 using
|
|
the given loader with a description FreeBSD-11:
|
|
.Pp
|
|
.Dl efibootmgr -c -d ada0 -p 1 -l/EFI/BOOT/BOOTX64.EFI -L FreeBSD-11
|
|
.Pp
|
|
This will result in the next available BootVarNum being assigned to a
|
|
new UEFI load variable, and given the label "FreeBSD-11" such as:
|
|
.Pp
|
|
.Dl Boot0009 FreeBSD-11
|
|
.Pp
|
|
Note newly created BootVars are created inactive. The active state is denoted
|
|
by an '*' following the BootVar 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.
|
|
.Pp
|
|
.Dl efibootmgr -B 0009
|
|
.Pp
|
|
Will delete the given BootVar Boot0009
|
|
.Pp
|
|
To set a given newly created BootVar active use:
|
|
.Pp
|
|
.Dl efibootmgr -a 0009
|
|
.Pp
|
|
To set a given BootVar to be used as the BootNext variable, irrespective
|
|
of its active state, use:
|
|
.Pp
|
|
.Dl efibootmgr -n 0009
|
|
.Pp
|
|
To set the BootOrder for the next reboot use:
|
|
.Pp
|
|
.Dl efibootmgr -o 0009,0003,...
|
|
.Pp
|
|
.Sh SEE ALSO
|
|
.Xr efivar 8 ,
|
|
.Xr uefi 8 ,
|
|
.Xr gpart 8
|