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30 .Nd manipulate the EFI Boot Manager
74 program manipulates how UEFI Boot Managers boot the system.
75 It can create and destroy methods for booting along with activating or
77 It can also change the defined order of boot methods.
78 It can create a temporary boot (BootNext) variable that references a
79 boot method to be tried once upon the next boot.
81 The UEFI standard defines how hosts may control what is used to
83 Each method is encapsulated within a persistent UEFI variable, stored
84 by the UEFI BIOS of the form
86 (where XXXX are uppercase hexadecimal digits).
87 These variables are numbered, each describing where to load the bootstrap
88 program from, and whether or not the method is active (used for booting,
89 otherwise the method will be skipped).
90 The order of these methods is controlled by another variable,
92 The currently booted method is communicated using
94 A global timeout can also be set.
97 requires that the kernel module
99 module be present or loaded to get and set these
100 non-volatile variables.
102 The following options are available:
107 boot entry, or the new entry when used with
113 .It Fl b -bootnum Ar bootnum
114 When creating or modifying an entry, use
117 When creating a new entry, fail if it already exists.
125 variable (aka method or entry).
127 Process but do not change any variables.
131 path to the ESP device, derived from the EFI variables
135 This is the ESP partition used by UEFI to boot the current
136 instance of the system.
139 is specified, the UEFI device path to the ESP is reported instead.
142 is specified, the mount point of the ESP is reported instead.
143 .It Fl f -fw-ui , Fl F -no-fw-ui
144 Set or clear the request to the system firmware to stop in its user
145 interface on the next boot.
146 .It Fl k -kernel Ar kernel
147 The path to and name of the kernel.
148 .It Fl l -loader Ar loader
149 The path to and name of the loader.
150 .It Fl L -label Ar label
151 An optional description for the method.
158 .It Fl N -delete-bootnext
162 .It Fl o -bootorder Ar bootorder
165 variable to the given comma delimited set of
167 The numbers are in hex to match
168 .Cm Boot Ns Em XXXX ,
169 but may omit leading zeros.
170 .It Fl t -set-timeout Ar timeout
171 Set the bootmenu timeout value.
172 .It Fl T -del-timeout
176 .It Fl u -efidev Ar unix-path
177 Displays the UEFI device path of
180 Display the device path of boot entries in the output.
183 To display the current
185 related variables in the system:
189 This will display the optional
193 (currently booted method), followed by the optional
197 that may be set, followed finally by all currently defined
199 variables, active or not.
202 augments this output with the disk partition uuids,
203 size/offset and device-path of the variable.
204 The flag will also include any unreferenced (by BootOrder) variables.
208 program can be used to create new EFI boot variables.
209 The following command may be used to create a new boot method, using
210 the EFI partition mounted under
212 mark the method active, using
213 the given loader and label the method
216 .Dl efibootmgr -a -c -l /boot/efi/EFI/freebsd/loader.efi -L FreeBSD-11
218 This will result in the next available bootnum being assigned to a
219 new UEFI boot variable, and given the label
223 .Dl Boot0009 FreeBSD-11
225 Note newly created boot entries are, by default, created inactive, hence
228 flag is specified above so that it will be considered for booting.
229 The active state is denoted by a '*' following the
232 They are also inserted into the first position of current
234 variable if it exists.
235 They must first be set to active before being considered available to attempt
236 booting from, else they are ignored.
238 .Dl efibootmgr -B -b 0009
240 Will delete the given boot entry Boot0009.
242 To set the given boot entry active:
244 .Dl efibootmgr -a -b 0009
246 To set a given boot entry to be used as the
248 variable, irrespective of its active state, use:
250 .Dl efibootmgr -n -b 0009
254 for the next reboot use:
256 .Dl efibootmgr -o 0009,0003,...
263 The Unified Extensible Firmware Interface Specification is available