LOADER.CONF(5) loader.conf LOADER.CONF(5)
NAME
loader.conf - Configuration file for systemd-boot
SYNOPSIS
ESP/loader/loader.conf, ESP/loader/entries/*.conf
DESCRIPTION
systemd-boot(7) will read ESP/loader/loader.conf and any files with the
".conf" extension under ESP/loader/entries/ on the EFI system partition
(ESP).
Each configuration file must consist of an option name, followed by
whitespace, and the option value. "#" may be used to start a comment
line. Empty and comment lines are ignored.
Boolean arguments may be written as "yes"/"y"/"true"/"1" or
"no"/"n"/"false"/"0".
OPTIONS
The following configuration options in loader.conf are understood:
default
A glob pattern to select the default entry. The default entry may
be changed in the boot menu itself, in which case the name of the
selected entry will be stored as an EFI variable, overriding this
option.
timeout
How long the boot menu should be shown before the default entry is
booted, in seconds. This may be changed in the boot menu itself and
will be stored as an EFI variable in that case, overriding this
option.
If the timeout is disabled, the default entry will be booted
immediately. The menu can be shown by pressing and holding a key
before systemd-boot is launched.
console-mode
This option configures the resolution of the console. Takes a
number or one of the special values listed below. The following
values may be used:
0
Standard UEFI 80x25 mode
1
80x50 mode, not supported by all devices
2
the first non-standard mode provided by the device firmware, if
any
auto
Pick a suitable mode automatically using heuristics
max
Pick the highest-numbered available mode
keep
Keep the mode selected by firmware (the default)
editor
Takes a boolean argument. Enable (the default) or disable the
editor. The editor should be disabled if the machine can be
accessed by unauthorized persons.
auto-entries
Takes a boolean argument. Enable (the default) or disable entries
for other boot entries found on the boot partition. In particular,
this may be useful when loader entries are created to show
replacement descriptions for those entries.
auto-firmware
Takes a boolean argument. Enable (the default) or disable the
"Reboot into firmware" entry.
random-seed-mode
Takes one of "off", "with-system-token" and "always". If "off" no
random seed data is read off the ESP, nor passed to the OS. If
"with-system-token" (the default) systemd-boot will read a random
seed from the ESP (from the file /loader/random-seed) only if the
LoaderSystemToken EFI variable is set, and then derive the random
seed to pass to the OS from the combination. If "always" the boot
loader will do so even if LoaderSystemToken is not set. This mode
is useful in environments where protection against OS image reuse
is not a concern, and the random seed shall be used even with no
further setup in place. User bootctl random-seed to initialize both
the random seed file in the ESP and the system token EFI variable.
See Random Seeds[1] for further information.
EXAMPLE
# /boot/efi/loader/loader.conf
timeout 0
default 01234567890abcdef1234567890abdf0-*
editor no
The menu will not be shown by default (the menu can still be shown by
pressing and holding a key during boot). One of the entries with files
with a name starting with "01234567890abcdef1234567890abdf0-" will be
selected by default. If more than one entry matches, the one with the
highest priority will be selected (generally the one with the highest
version number). The editor will be disabled, so it is not possible to
alter the kernel command line.
SEE ALSO
systemd-boot(7), bootctl(1)
NOTES
1. Random Seeds
https://systemd.io/RANDOM_SEEDS
systemd 245 LOADER.CONF(5)