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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1+ -->
<refentry id="sd-boot" conditional='ENABLE_EFI'
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd-boot</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>I wrote this page</contrib>
<firstname>Zbigniew</firstname>
<surname>Jędrzejewski-Szmek</surname>
<email>zbyszek@in.waw.pl</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>sd-boot</refentrytitle>
<manvolnum>7</manvolnum>
</refmeta>
<refnamediv>
<refname>sd-boot</refname>
<refpurpose>A simple UEFI boot manager</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para><command>systemd-boot</command> or <command>sd-boot</command> is a simple
UEFI boot manager, previously known as <command>gummiboot</command>. It provides
a graphical menu to select the entry to boot and an editor for the kernel command
line. sd-boot is only useful on machines using UEFI.
</para>
<para>sd-boot loads information from the EFI system partition (ESP), usually
mounted at <filename>/boot</filename>, <filename>/efi</filename>, or
<filename>/boot/efi</filename>. Configuration file fragments, kernels, initrds,
other EFI images need to reside on the ESP. Linux kernels must be built with
<option>CONFIG_EFI_STUB</option> to be able to be directly executed as an EFI
image. sd-boot will automatically list other boot entries registered as EFI boot
variables, and a list of kernels from configuration files following the <ulink
url="https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec">Boot Loader
Specification</ulink> located under <filename>/loader/entries/</filename> on the
ESP.</para>
<para><citerefentry><refentrytitle>kernel-install</refentrytitle><manvolnum>8</manvolnum></citerefentry>
may be used to copy kernel images onto the ESP and to generate entries compliant
with the Boot Loader Specification.
<citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
may be used from a running system to locate the ESP, list available entries, and
install sd-boot itself.</para>
<para>sd-boot will provide information about the time spent in UEFI firmware
using the
<ulink url="https://www.freedesktop.org/wiki/Software/systemd/BootLoaderInterface">Boot Loader Interface</ulink>.
This information can be displayed using
<citerefentry><refentrytitle>systemd-analyze</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>
<title>Configuration</title>
<para>sd-boot reads configuration like the timeout and default entry from
<filename>/loader/loader.conf</filename> on the ESP and from EFI variables. See
<citerefentry><refentrytitle>loader.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>
<title>Key bindings</title>
<para>The following keys may be used in the boot menu:</para>
<variablelist>
<varlistentry>
<term>↑ (Up)</term>
<term>↓ (Down)</term>
<term>j</term>
<term>k</term>
<term>PageUp</term>
<term>PageDown</term>
<term>Home</term>
<term>End</term>
<listitem><para>Navigate up/down in the entry list</para></listitem>
</varlistentry>
<varlistentry>
<term>↵ (Enter)</term>
<listitem><para>Boot selected entry</para></listitem>
</varlistentry>
<varlistentry>
<term>d</term>
<listitem><para>Make selected entry the default</para></listitem>
</varlistentry>
<varlistentry>
<term>e</term>
<listitem><para>Edit the kernel command line for selected entry</para></listitem>
</varlistentry>
<varlistentry>
<term>+</term>
<term>t</term>
<listitem><para>Increase the timeout before default entry is booted</para></listitem>
</varlistentry>
<varlistentry>
<term>-</term>
<term>T</term>
<listitem><para>Decrease the timeout</para></listitem>
</varlistentry>
<varlistentry>
<term>v</term>
<listitem><para>Show sd-boot, UEFI, and firmware versions</para></listitem>
</varlistentry>
<varlistentry>
<term>P</term>
<listitem><para>Print status</para></listitem>
</varlistentry>
<varlistentry>
<term>Q</term>
<listitem><para>Quit</para></listitem>
</varlistentry>
<varlistentry>
<term>h</term>
<term>?</term>
<listitem><para>Show a help screen</para></listitem>
</varlistentry>
<varlistentry>
<term>Ctrl + l</term>
<listitem><para>Reprint the screen</para></listitem>
</varlistentry>
</variablelist>
<para>The following keys may be used during bootup or in the boot menu to
directly boot a specific entry:</para>
<variablelist>
<varlistentry>
<term>l</term>
<listitem><para>Linux</para></listitem>
</varlistentry>
<varlistentry>
<term>w</term>
<listitem><para>Windows</para></listitem>
</varlistentry>
<varlistentry>
<term>a</term>
<listitem><para>OS X</para></listitem>
</varlistentry>
<varlistentry>
<term>s</term>
<listitem><para>EFI shell</para></listitem>
</varlistentry>
<varlistentry>
<term>1</term>
<term>2</term>
<term>3</term>
<term>4</term>
<term>5</term>
<term>6</term>
<term>7</term>
<term>8</term>
<term>9</term>
<listitem><para>Entry number 1 .. 9</para></listitem>
</varlistentry>
</variablelist>
<para>In the editor, most keys simply insert themselves, but the following keys
may be used to perform additional actions:</para>
<variablelist>
<varlistentry>
<term>← (Left)</term>
<term>→ (Right)</term>
<term>Home</term>
<term>End</term>
<listitem><para>Navigate left/right</para></listitem>
</varlistentry>
<varlistentry>
<term>Esc</term>
<listitem><para>Abort the edit and quit the editor</para></listitem>
</varlistentry>
<varlistentry>
<term>Ctrl + k</term>
<listitem><para>Clear the command line</para></listitem>
</varlistentry>
<varlistentry>
<term>Ctrl + w</term>
<term>Alt + Backspace</term>
<listitem><para>Delete word backwards</para></listitem>
</varlistentry>
<varlistentry>
<term>Alt + d </term>
<listitem><para>Delete word forwards</para></listitem>
</varlistentry>
<varlistentry>
<term>↵ (Enter)</term>
<listitem><para>Boot entry with the edited command line</para></listitem>
</varlistentry>
</variablelist>
<para>Note that unless configured otherwise in the UEFI firmware, sd-boot will
use the US keyboard layout, so key labels might not match for keys like +/-.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>loader.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<ulink url="https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec">Boot Loader Specification</ulink>,
<ulink url="https://www.freedesktop.org/wiki/Software/systemd/BootLoaderInterface">Boot Loader Interface</ulink>,
<ulink url="https://www.freedesktop.org/wiki/Software/systemd/systemd-boot/">upstream wiki page</ulink>
</para>
</refsect1>
</refentry>
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