1 files changed, 90 insertions, 0 deletions
diff --git a/doc/usage/cmd/bootmenu.rst b/doc/usage/cmd/bootmenu.rst
new file mode 100644
index 0000000000..1016ac8ceb
--- /dev/null
+++ b/doc/usage/cmd/bootmenu.rst
@@ -0,0 +1,90 @@
+.. 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