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<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
<!ENTITY % entities SYSTEM "custom-entities.ent" >
%entities;
]>
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="systemd-tpm2-generator">
<refentryinfo>
<title>systemd-tpm2-generator</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-tpm2-generator</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-tpm2-generator</refname>
<refpurpose>Generator for inserting TPM2 synchronization point in the boot process</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>/usr/lib/systemd/system-generators/systemd-tpm2-generator</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><filename>systemd-tpm2-generator</filename> is a generator that adds a <varname>Wants=</varname>
dependency from <filename>sysinit.target</filename> to <filename>tpm2.target</filename> when it detects
that the firmware discovered a TPM2 device but the OS kernel so far did
not. <filename>tpm2.target</filename> is supposed to act as synchronization point for all services that
require TPM2 device access. See
<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry> for
details.</para>
<para>The <option>systemd.tpm2_wait=</option> kernel command line option may be used to override
behaviour of the generator. It accepts a boolean value: if true then <filename>tpm2.target</filename>
will be added as synchronization point even if the firmware has not detected a TPM2 device. If false, the
target will not be inserted even if firmware reported a device but the OS kernel doesn't expose a device
for it yet. The latter might be useful in environments where a suitable TPM2 driver for the available
hardware is not available.</para>
<para><filename>systemd-tpm2-generator</filename> implements
<citerefentry><refentrytitle>systemd.generator</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para><simplelist type="inline">
<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
<member><citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
</simplelist></para>
</refsect1>
</refentry>
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