X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=man%2Fbootup.xml;h=65923528d4429d5046955ffc76873353fcbe7860;hp=f65abf5452364219e3a36cbbf941102522de82ee;hb=4c42e8e1618e2352cb628d459593233a86202ce6;hpb=0a4c519bd3f5cd00c77e022504f38fc899e23c1b

diff --git a/man/bootup.xml b/man/bootup.xml
index f65abf545..65923528d 100644
--- a/man/bootup.xml
+++ b/man/bootup.xml
@@ -173,6 +173,77 @@
                 to them.</para>
         </refsect1>
 
+        <refsect1>
+                <title>Initrd System Manager Bootup</title>
+                <para>The default target in the initrd is the initrd.target. The bootup process is
+                identical to the System Manager Bootup until it reaches basic.target. From there,
+                systemd approaches the special initrd.target. If the root device can be mounted at
+                /sysroot, the sysroot.mount unit becomes active and the initrd-root-fs.target is
+                reached.
+                The initrd-parse-etc.service scans /sysroot/etc/fstab for a possible /usr mountpoint
+                and additional entries marked with the <emphasis>x-initrd.mount</emphasis> option.
+                All entries found are mounted below /sysroot, and the initrd-fs.target is reached.
+                The initrd-cleanup.service isolates to the initrd-switch-root.target, where cleanup
+                services can run. As the very last step, the initrd-switch-root.service is activated,
+                which will cause the system to switch its root to /sysroot.
+                </para>
+
+<programlisting>
+                             (identical to System Manager Bootup)
+                                               :
+                                               :
+                                               v
+                                         basic.target
+                                               |                                 emergency.service
+                        ______________________/|                                         |
+                       /                       |                                         v
+                       |                  sysroot.mount                          <emphasis>emergency.target</emphasis>
+                       |                       |
+                       |                       v
+                       |             initrd-root-fs.target
+                       |                       |
+                       |                       v
+                       |            initrd-parse-etc.service
+           (custom initrd services)            |
+                       |                       v
+                       |            (sysroot-usr.mount and
+                       |             various mounts marked
+                       |               with fstab option
+                       |                x-initrd.mount)
+                       |                       |
+                       |                       v
+                       |                initrd-fs.target
+                       \______________________ |
+                                              \|
+                                               v
+                                          initrd.target
+                                               |
+                                               v
+                                     initrd-cleanup.service
+                                          isolates to
+                                    initrd-switch-root.target
+                                               |
+                                               v
+                        ______________________/|
+                       /                       |
+                       |        initrd-udevadm-cleanup-db.service
+                       |                       |
+           (custom initrd services)            |
+                       |                       |
+                       \______________________ |
+                                              \|
+                                               v
+                                   initrd-switch-root.target
+                                               |
+                                               v
+                                   initrd-switch-root.service
+                                               |
+                                               v
+                                          switch-root
+</programlisting>
+        </refsect1>
+
+
         <refsect1>
                 <title>System Manager Shutdown</title>