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man: document XBOOTLDR search logic for sd-boot
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Lennart Poettering
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<refsect1>
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<title>Description</title>
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<para><command>systemd-boot</command> (short: <command>sd-boot</command>) is a simple UEFI boot manager. It
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provides a graphical menu to select the entry to boot and an editor for the kernel command line. systemd-boot
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supports systems with UEFI firmware only.</para>
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<para><command>systemd-boot</command> (short: <command>sd-boot</command>) is a simple UEFI boot
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manager. It provides a graphical menu to select the entry to boot and an editor for the kernel command
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line. <command>systemd-boot</command> supports systems with UEFI firmware only.</para>
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<para>systemd-boot loads boot entry information from the EFI system partition (ESP), usually mounted at
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<filename>/boot</filename>, <filename>/efi</filename>, or <filename>/boot/efi</filename> during OS
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runtime. Configuration file fragments, kernels, initrds and other EFI images to boot generally need to reside on
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the ESP. Linux kernels must be built with <option>CONFIG_EFI_STUB</option> to be able to be directly executed as an
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EFI image. During boot systemd-boot automatically assembles a list of boot entries from the following
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sources:</para>
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<filename>/efi/</filename>, <filename>/boot/</filename>, or <filename>/boot/efi/</filename> during OS
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runtime, as well as from the Extended Boot Loader partition if it exists (usually mounted to
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<filename>/boot/</filename>). Configuration file fragments, kernels, initrds and other EFI images to boot
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generally need to reside on the ESP or the Extended Boot Loader partition. Linux kernels must be built
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with <option>CONFIG_EFI_STUB</option> to be able to be directly executed as an EFI image. During boot
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systemd-boot automatically assembles a list of boot entries from the following sources:</para>
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<itemizedlist>
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<listitem><para>Boot entries defined with <ulink
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url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader
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Specification</ulink> description files located in <filename>/loader/entries/</filename> on the ESP. These
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usually describe Linux kernel images with associated initrd images, but alternatively may also describe
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arbitrary other EFI executables.</para></listitem>
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url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader Specification</ulink> description files
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located in <filename>/loader/entries/</filename> on the ESP and the Extended Boot Loader
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Partition. These usually describe Linux kernel images with associated initrd images, but alternatively
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may also describe arbitrary other EFI executables.</para></listitem>
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<listitem><para>Unified kernel images following the <ulink
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url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader
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Specification</ulink>, as executable EFI binaries in <filename>/EFI/Linux/</filename> on the ESP.
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url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader Specification</ulink>, as executable EFI
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binaries in <filename>/EFI/Linux/</filename> on the ESP and the Extended Boot Loader Partition.
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</para></listitem>
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<listitem><para>The Microsoft Windows EFI boot manager, if installed</para></listitem>
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@ -57,10 +58,12 @@
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<listitem><para>A reboot into the UEFI firmware setup option, if supported by the firmware</para></listitem>
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</itemizedlist>
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<para><citerefentry><refentrytitle>kernel-install</refentrytitle><manvolnum>8</manvolnum></citerefentry> may be
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used to copy kernel images onto the ESP and to generate description files compliant with the Boot Loader
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Specification. <citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> may be
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used from a running system to locate the ESP, list available entries, and install systemd-boot itself.</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 or the Extended Boot Loader Partition and to generate
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description files compliant with the Boot Loader
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Specification. <citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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may be used from a running system to locate the ESP and the Extended Boot Loader Partition, list
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available entries, and install <command>systemd-boot</command> itself.</para>
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<para>systemd-boot will provide information about the time spent in UEFI firmware using the <ulink
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url="https://systemd.io/BOOT_LOADER_INTERFACE">Boot Loader Interface</ulink>. This information can be displayed
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@ -224,16 +227,19 @@
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<refsect1>
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<title>Files</title>
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<para>The files systemd-boot reads generally reside on the UEFI ESP which is usually mounted to
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<filename>/boot/</filename>, <filename>/efi/</filename> or <filename>/boot/efi</filename> during OS
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runtime. systemd-boot reads runtime configuration such as the boot timeout and default entry from
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<filename>/loader/loader.conf</filename> on the ESP (in combination with data read from EFI variables). See
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<citerefentry><refentrytitle>loader.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>. Boot entry
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description files following the <ulink
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url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader
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Specification</ulink> are read from <filename>/loader/entries/</filename> on the ESP. Unified kernel boot entries
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following the <ulink url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot
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Loader Specification</ulink> are read from <filename>/EFI/Linux/</filename> on the ESP.</para>
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<para>The files <command>systemd-boot</command> processes generally reside on the UEFI ESP which is
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usually mounted to <filename>/efi/</filename>, <filename>/boot/</filename> or
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<filename>/boot/efi/</filename> during OS runtime. It also processes files on the Extended Boot Loader
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partition which is typically mounted to <filename>/boot/</filename>, if it
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exists. <command>systemd-boot</command> reads runtime configuration such as the boot timeout and default
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entry from <filename>/loader/loader.conf</filename> on the ESP (in combination with data read from EFI
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variables). See
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<citerefentry><refentrytitle>loader.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>. Boot
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entry description files following the <ulink url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot
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Loader Specification</ulink> are read from <filename>/loader/entries/</filename> on the ESP and the
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Extended Boot Loader partition. Unified kernel boot entries following the <ulink
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url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader Specification</ulink> are read from
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<filename>/EFI/Linux/</filename> on the ESP and the Extended Boot Loader partition.</para>
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</refsect1>
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<refsect1>
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