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https://github.com/systemd/systemd.git
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204 lines
7.4 KiB
XML
204 lines
7.4 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1+ -->
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<refentry id="loader.conf" conditional='ENABLE_EFI'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>loader.conf</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>loader.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>loader.conf</refname>
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<refpurpose>Configuration file for systemd-boot</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename><replaceable>ESP</replaceable>/loader/loader.conf</filename>,
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<filename><replaceable>ESP</replaceable>/loader/entries/*.conf</filename>
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</para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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will read <filename><replaceable>ESP</replaceable>/loader/loader.conf</filename> and any files with the
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<literal>.conf</literal> extension under
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<filename><replaceable>ESP</replaceable>/loader/entries/</filename> on the EFI system partition (ESP).
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</para>
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<para>Each configuration file must consist of an option name, followed by
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whitespace, and the option value. <literal>#</literal> may be used to start
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a comment line. Empty and comment lines are ignored.</para>
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<para>Boolean arguments may be written as
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<literal>yes</literal>/<literal>y</literal>/<literal>true</literal>/<literal>1</literal> or
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<literal>no</literal>/<literal>n</literal>/<literal>false</literal>/<literal>0</literal>.
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following configuration options in <filename>loader.conf</filename> are understood:</para>
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<variablelist>
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<varlistentry>
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<term>default</term>
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<listitem><para>A glob pattern to select the default entry. The default entry
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may be changed in the boot menu itself, in which case the name of the
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selected entry will be stored as an EFI variable, overriding this option.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>timeout</term>
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<listitem><para>How long the boot menu should be shown before the default
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entry is booted, in seconds. This may be changed in the boot menu itself and
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will be stored as an EFI variable in that case, overriding this option.
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</para>
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<para>If the timeout is disabled, the default entry will be booted
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immediately. The menu can be shown by pressing and holding a key before
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systemd-boot is launched.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>console-mode</term>
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<listitem><para>This option configures the resolution of the console. Takes a
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number or one of the special values listed below. The following values may be
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used:</para>
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<variablelist>
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<varlistentry>
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<term>0</term>
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<listitem>
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<para>Standard UEFI 80x25 mode</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>1</term>
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<listitem>
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<para>80x50 mode, not supported by all devices</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>2</term>
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<listitem>
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<para>the first non-standard mode provided by the device
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firmware, if any</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>auto</term>
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<listitem>
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<para>Pick a suitable mode automatically using heuristics</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>max</term>
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<listitem>
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<para>Pick the highest-numbered available mode</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>keep</term>
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<listitem>
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<para>Keep the mode selected by firmware (the default)</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>editor</term>
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<listitem><para>Takes a boolean argument. Enable (the default) or disable the
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editor. The editor should be disabled if the machine can be accessed by
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unauthorized persons.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>auto-entries</term>
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<listitem><para>Takes a boolean argument. Enable (the default) or disable
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entries for other boot entries found on the boot partition. In particular,
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this may be useful when loader entries are created to show replacement
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descriptions for those entries.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>auto-firmware</term>
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<listitem><para>Takes a boolean argument. Enable (the default) or disable
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the "Reboot into firmware" entry.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>random-seed-mode</term>
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<listitem><para>Takes one of <literal>off</literal>, <literal>with-system-token</literal> and
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<literal>always</literal>. If <literal>off</literal> no random seed data is read off the ESP, nor
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passed to the OS. If <literal>with-system-token</literal> (the default)
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<command>systemd-boot</command> will read a random seed from the ESP (from the file
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<filename>/loader/random-seed</filename>) only if the <varname>LoaderSystemToken</varname> EFI
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variable is set, and then derive the random seed to pass to the OS from the combination. If
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<literal>always</literal> the boot loader will do so even if <varname>LoaderSystemToken</varname> is
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not set. This mode is useful in environments where protection against OS image reuse is not a
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concern, and the random seed shall be used even with no further setup in place. User <command>bootctl
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random-seed</command> to initialize both the random seed file in the ESP and the system token EFI
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variable.</para>
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<para>See <ulink url="https://systemd.io/RANDOM_SEEDS">Random Seeds</ulink> for further
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information.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Example</title>
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<programlisting># /boot/efi/loader/loader.conf
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timeout 0
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default 01234567890abcdef1234567890abdf0-*
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editor no
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</programlisting>
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<para>The menu will not be shown by default (the menu can still be shown by
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pressing and holding a key during boot). One of the entries with files with a
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name starting with <literal>01234567890abcdef1234567890abdf0-</literal> will be
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selected by default. If more than one entry matches, the one with the highest
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priority will be selected (generally the one with the highest version number).
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The editor will be disabled, so it is not possible to alter the kernel command
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line.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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