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man: document how to get the boot menu with zero time-out 

Fixes: #15125
This commit is contained in:
Lennart Poettering 2020-04-21 11:18:56 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent 4a582e73b9
commit e14a0c21e9
1 changed files with 13 additions and 2 deletions
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15
man/systemd-boot.xml
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@ -176,8 +176,8 @@
</varlistentry>
</variablelist>
<para>The following keys may be used during bootup or in the boot menu to
directly boot a specific entry:</para>
<para>The following keys may be pressed during bootup or in the boot menu to directly boot a specific
entry:</para>
<variablelist>
<varlistentry>
@ -214,6 +214,17 @@
</varlistentry>
</variablelist>
<para>The boot menu is shown when a non-zero menu timeout has been configured. If the menu timeout has
been set to zero, it is sufficient to press any key — before the boot loader initializes — to bring up
the boot menu, except for the keys listed immediately above as they directly boot into the selected boot
menu item. Note that depending on the firmware implementation the time window where key presses are
accepted before the boot loader initializes might be short. If the window is missed, reboot and try
again, possibly pressing a suitable key (e.g. the space bar) continuously; on most systems it should be
possible to hit the time window after a few attempts. To avoid this problem, consider setting a non-zero
timeout, thus showing the boot menu unconditionally. Some desktop environments might offer an option to
directly boot into the boot menu, to avoid the problem altogether. Alternatively, use the command line
<command>systemctl reboot --boot-loader-menu=0</command> from the shell.</para>
<para>In the editor, most keys simply insert themselves, but the following keys
may be used to perform additional actions:</para>