doc: move README.bootmenu to HTML doc
Convert README.bootmenu to reStructured text and move it to
usage/bootmenu.rst.
Adjust the text concerning configuration settings as these now are managed
via Kconfig.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Pali Rohár <pali@kernel.org>
diff --git a/doc/usage/bootmenu.rst b/doc/usage/bootmenu.rst
new file mode 100644
index 0000000..1f094ad
--- /dev/null
+++ b/doc/usage/bootmenu.rst
@@ -0,0 +1,95 @@
+.. SPDX-License-Identifier: GPL-2.0+
+.. (C) Copyright 2011-2012 Pali Rohár <pali@kernel.org>
+
+bootmenu command
+================
+
+The "bootmenu" command uses U-Boot menu interfaces and provides
+a simple mechanism for creating menus with different boot items.
+The cursor keys "Up" and "Down" are used for navigation through
+the items. Current active menu item is highlighted and can be
+selected using the "Enter" key. The selection of the highlighted
+menu entry invokes an U-Boot command (or a list of commands)
+associated with this menu entry.
+
+The "bootmenu" command interprets ANSI escape sequencies, so
+an ANSI terminal is required for proper menu rendering and item
+selection.
+
+The assembling of the menu is done via a set of environment variables
+"bootmenu_<num>" and "bootmenu_delay", i.e.::
+
+ bootmenu_delay=<delay>
+ bootmenu_<num>="<title>=<commands>"
+
+<delay>
+ is the autoboot delay in seconds, after which the first
+ menu entry will be selected automatically
+
+<num>
+ is the boot menu entry number, starting from zero
+
+<title>
+ is the text of the menu entry shown on the console
+ or on the boot screen
+
+<commands>
+ are commands which will be executed when a menu
+ entry is selected
+
+Title and commands are separated by the first appearance of a '='
+character in the value of the environment variable.
+
+The first (optional) argument of the "bootmenu" command is a delay specifier
+and it overrides the delay value defined by "bootmenu_delay" environment
+variable. If the environment variable "bootmenu_delay" is not set or if
+the argument of the "bootmenu" command is not specified, the default delay
+will be CONFIG_BOOTDELAY. If delay is 0, no menu entries will be shown on
+the console (or on the screen) and the command of the first menu entry will
+be called immediately. If delay is less then 0, bootmenu will be shown and
+autoboot will be disabled.
+
+Bootmenu always adds menu entry "U-Boot console" at the end of all menu
+entries specified by environment variables. When selecting this entry
+the bootmenu terminates and the usual U-Boot command prompt is presented
+to the user.
+
+Example environment::
+
+ setenv bootmenu_0 Boot 1. kernel=bootm 0x82000000 # Set first menu entry
+ setenv bootmenu_1 Boot 2. kernel=bootm 0x83000000 # Set second menu entry
+ setenv bootmenu_2 Reset board=reset # Set third menu entry
+ setenv bootmenu_3 U-Boot boot order=boot # Set fourth menu entry
+ bootmenu 20 # Run bootmenu with autoboot delay 20s
+
+
+The above example will be rendered as below::
+
+ *** U-Boot Boot Menu ***
+
+ Boot 1. kernel
+ Boot 2. kernel
+ Reset board
+ U-Boot boot order
+ U-Boot console
+
+ Hit any key to stop autoboot: 20
+ Press UP/DOWN to move, ENTER to select
+
+The selected menu entry will be highlighted - it will have inverted
+background and text colors.
+
+The "bootmenu" cammand is enabled by::
+
+ CONFIG_CMD_BOOTMENU=y
+
+To run the bootmenu at startup add these additional settings::
+
+ CONFIG_AUTOBOOT_KEYED=y
+ CONFIG_BOOTDELAY=30
+ CONFIG_AUTOBOOT_MENU_SHOW=y
+
+When you intend to use the bootmenu on a color frame buffer console,
+make sure to additionally define::
+
+ CONFIG_CFB_CONSOLE_ANSI=y
diff --git a/doc/usage/index.rst b/doc/usage/index.rst
index 063e970..d0f5a9f 100644
--- a/doc/usage/index.rst
+++ b/doc/usage/index.rst
@@ -11,4 +11,5 @@
.. toctree::
:maxdepth: 1
+ bootmenu
pstore