mirror of
https://github.com/systemd/systemd.git
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241 lines
7.8 KiB
XML
241 lines
7.8 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//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="sd-boot" 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>sd-boot</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>I wrote this page</contrib>
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<firstname>Zbigniew</firstname>
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<surname>Jędrzejewski-Szmek</surname>
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<email>zbyszek@in.waw.pl</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd-boot</refentrytitle>
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<manvolnum>7</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd-boot</refname>
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<refpurpose>A simple UEFI boot manager</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-boot</command> or <command>sd-boot</command> is a simple
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UEFI boot manager, previously known as <command>gummiboot</command>. It provides
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a graphical menu to select the entry to boot and an editor for the kernel command
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line. sd-boot is only useful on machines using UEFI.
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</para>
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<para>sd-boot loads information from the EFI system partition (ESP), usually
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mounted at <filename>/boot</filename>, <filename>/efi</filename>, or
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<filename>/boot/efi</filename>. Configuration file fragments, kernels, initrds,
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other EFI images need to reside on the ESP. Linux kernels must be built with
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<option>CONFIG_EFI_STUB</option> to be able to be directly executed as an EFI
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image. sd-boot will automatically list other boot entries registered as EFI boot
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variables, and a list of kernels from configuration files following the <ulink
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url="https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec">Boot Loader
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Specification</ulink> located under <filename>/loader/entries/</filename> on the
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ESP.</para>
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<para><citerefentry><refentrytitle>kernel-install</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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may be used to copy kernel images onto the ESP and to generate entries compliant
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with the Boot Loader Specification.
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<citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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may be used from a running system to locate the ESP, list available entries, and
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install sd-boot itself.</para>
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<para>sd-boot will provide information about the time spent in UEFI firmware
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using the
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<ulink url="https://www.freedesktop.org/wiki/Software/systemd/BootLoaderInterface">Boot Loader Interface</ulink>.
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This information can be displayed using
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<citerefentry><refentrytitle>systemd-analyze</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
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</para>
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</refsect1>
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<refsect1>
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<title>Configuration</title>
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<para>sd-boot reads configuration like the timeout and default entry from
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<filename>/loader/loader.conf</filename> on the ESP and from EFI variables. See
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<citerefentry><refentrytitle>loader.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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</refsect1>
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<refsect1>
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<title>Key bindings</title>
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<para>The following keys may be used in the boot menu:</para>
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<variablelist>
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<varlistentry>
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<term>↑ (Up)</term>
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<term>↓ (Down)</term>
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<term>j</term>
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<term>k</term>
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<term>PageUp</term>
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<term>PageDown</term>
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<term>Home</term>
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<term>End</term>
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<listitem><para>Navigate up/down in the entry list</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>↵ (Enter)</term>
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<listitem><para>Boot selected entry</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>d</term>
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<listitem><para>Make selected entry the default</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>e</term>
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<listitem><para>Edit the kernel command line for selected entry</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>+</term>
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<term>t</term>
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<listitem><para>Increase the timeout before default entry is booted</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>-</term>
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<term>T</term>
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<listitem><para>Decrease the timeout</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>v</term>
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<listitem><para>Show sd-boot, UEFI, and firmware versions</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>P</term>
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<listitem><para>Print status</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>Q</term>
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<listitem><para>Quit</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>h</term>
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<term>?</term>
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<listitem><para>Show a help screen</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>Ctrl + l</term>
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<listitem><para>Reprint the screen</para></listitem>
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</varlistentry>
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</variablelist>
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<para>The following keys may be used during bootup or in the boot menu to
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directly boot a specific entry:</para>
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<variablelist>
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<varlistentry>
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<term>l</term>
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<listitem><para>Linux</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>w</term>
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<listitem><para>Windows</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>a</term>
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<listitem><para>OS X</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>s</term>
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<listitem><para>EFI shell</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>1</term>
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<term>2</term>
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<term>3</term>
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<term>4</term>
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<term>5</term>
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<term>6</term>
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<term>7</term>
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<term>8</term>
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<term>9</term>
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<listitem><para>Entry number 1 .. 9</para></listitem>
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</varlistentry>
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</variablelist>
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<para>In the editor, most keys simply insert themselves, but the following keys
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may be used to perform additional actions:</para>
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<variablelist>
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<varlistentry>
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<term>← (Left)</term>
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<term>→ (Right)</term>
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<term>Home</term>
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<term>End</term>
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<listitem><para>Navigate left/right</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>Esc</term>
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<listitem><para>Abort the edit and quit the editor</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>Ctrl + k</term>
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<listitem><para>Clear the command line</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>Ctrl + w</term>
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<term>Alt + Backspace</term>
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<listitem><para>Delete word backwards</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>Alt + d </term>
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<listitem><para>Delete word forwards</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>↵ (Enter)</term>
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<listitem><para>Boot entry with the edited command line</para></listitem>
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</varlistentry>
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</variablelist>
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<para>Note that unless configured otherwise in the UEFI firmware, sd-boot will
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use the US keyboard layout, so key labels might not match for keys like +/-.
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</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>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>loader.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<ulink url="https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec">Boot Loader Specification</ulink>,
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<ulink url="https://www.freedesktop.org/wiki/Software/systemd/BootLoaderInterface">Boot Loader Interface</ulink>,
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<ulink url="https://www.freedesktop.org/wiki/Software/systemd/systemd-boot/">upstream wiki page</ulink>
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</para>
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</refsect1>
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</refentry>
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