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man: document the new systemd-boot drop-in driver dir logic

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Lennart Poettering 2021-09-21 17:28:16 +02:00
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28
man/systemd-boot.xml
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@ -280,17 +280,29 @@
usually mounted to <filename>/efi/</filename>, <filename>/boot/</filename> or
<filename>/boot/efi/</filename> during OS runtime. It also processes files on the Extended Boot Loader
partition which is typically mounted to <filename>/boot/</filename>, if it
exists. <command>systemd-boot</command> reads runtime configuration such as the boot timeout and default
exists.</para>
<para><command>systemd-boot</command> reads runtime configuration such as the boot timeout and default
entry from <filename>/loader/loader.conf</filename> on the ESP (in combination with data read from EFI
variables). See
<citerefentry><refentrytitle>loader.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>. Boot
entry description files following the <ulink url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot
Loader Specification</ulink> are read from <filename>/loader/entries/</filename> on the ESP and the
Extended Boot Loader partition. Unified kernel boot entries following the <ulink
<citerefentry><refentrytitle>loader.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
<para>Boot entry description files following the <ulink
url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader Specification</ulink> are read from
<filename>/EFI/Linux/</filename> on the ESP and the Extended Boot Loader partition. Optionally, a random
seed for early boot entropy pool provisioning is stored in <filename>/loader/random-seed</filename> in
the ESP.</para>
<filename>/loader/entries/</filename> on the ESP and the Extended Boot Loader partition.</para>
<para>Unified kernel boot entries following the <ulink
url="https://systemd.io/BOOT_LOADER_SPECIFICATION">Boot Loader Specification</ulink> are read from
<filename>/EFI/Linux/</filename> on the ESP and the Extended Boot Loader partition.</para>
<para>Optionally, a random seed for early boot entropy pool provisioning is stored in
<filename>/loader/random-seed</filename> in the ESP.</para>
<para>During initialization, <command>sd-boot</command> automatically loads all driver files placed in
the <filename>/EFI/systemd/drivers/</filename> directory of the ESP. The files placed there must have an
extension of the EFI architecture ID followed by <filename>.efi</filename> (e.g. for x86-64 this means a
suffix of <filename>x64.efi</filename>). This may be used to automatically load file system drivers and
similar, to extend the native firmware support.</para>
</refsect1>
<refsect1>