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60971e63e6
Add the description of CLI commands to the generated index. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
168 lines
5.3 KiB
ReStructuredText
168 lines
5.3 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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.. (C) Copyright 2011-2012 Pali Rohár <pali@kernel.org>
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.. index::
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single: bootmenu (command)
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bootmenu command
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================
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Synopsis
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--------
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::
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bootmenu [delay]
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Description
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-----------
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The "bootmenu" command uses U-Boot menu interfaces and provides
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a simple mechanism for creating menus with different boot items.
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The cursor keys "Up" and "Down" are used for navigation through
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the items. Current active menu item is highlighted and can be
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selected using the "Enter" key. The selection of the highlighted
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menu entry invokes an U-Boot command (or a list of commands)
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associated with this menu entry.
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The "bootmenu" command interprets ANSI escape sequences, so
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an ANSI terminal is required for proper menu rendering and item
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selection.
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The assembling of the menu is done via a set of environment variables
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"bootmenu_<num>" and "bootmenu_delay", i.e.::
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bootmenu_delay=<delay>
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bootmenu_<num>="<title>=<commands>"
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<delay>
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is the autoboot delay in seconds, after which the first
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menu entry will be selected automatically
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<num>
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is the boot menu entry number, starting from zero
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<title>
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is the text of the menu entry shown on the console
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or on the boot screen
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<commands>
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are commands which will be executed when a menu
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entry is selected
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Title and commands are separated by the first appearance of a '='
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character in the value of the environment variable.
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The first (optional) argument of the "bootmenu" command is a delay specifier
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and it overrides the delay value defined by "bootmenu_delay" environment
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variable. If the environment variable "bootmenu_delay" is not set or if
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the argument of the "bootmenu" command is not specified, the default delay
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will be CONFIG_BOOTDELAY. If delay is 0, no menu entries will be shown on
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the console (or on the screen) and the command of the first menu entry will
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be called immediately. If delay is less then 0, bootmenu will be shown and
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autoboot will be disabled.
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Bootmenu always adds menu entry "U-Boot console" at the end of all menu
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entries specified by environment variables. When selecting this entry
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the bootmenu terminates and the usual U-Boot command prompt is presented
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to the user.
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Example environment::
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setenv bootmenu_0 Boot 1. kernel=bootm 0x82000000 # Set first menu entry
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setenv bootmenu_1 Boot 2. kernel=bootm 0x83000000 # Set second menu entry
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setenv bootmenu_2 Reset board=reset # Set third menu entry
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setenv bootmenu_3 U-Boot boot order=boot # Set fourth menu entry
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bootmenu 20 # Run bootmenu with autoboot delay 20s
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The above example will be rendered as below::
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*** U-Boot Boot Menu ***
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Boot 1. kernel
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Boot 2. kernel
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Reset board
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U-Boot boot order
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U-Boot console
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Hit any key to stop autoboot: 20
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Press UP/DOWN to move, ENTER to select
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The selected menu entry will be highlighted - it will have inverted
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background and text colors.
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UEFI boot variable enumeration
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''''''''''''''''''''''''''''''
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If enabled, the bootmenu command will automatically generate and add
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UEFI-related boot menu entries for the following items.
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* possible bootable media with default file names
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* user-defined UEFI boot options
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The bootmenu automatically enumerates the possible bootable
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media devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.
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This auto generated entry is named as "<interface> <devnum>:<part>" format.
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(e.g. "usb 0:1")
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The bootmenu displays the UEFI-related menu entries in order of "BootOrder".
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When the user selects the UEFI boot menu entry, the bootmenu sets
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the selected boot variable index to "BootNext" without non-volatile attribute,
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then call the uefi boot manager with the command "bootefi bootmgr".
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Example bootmenu is as below::
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*** U-Boot Boot Menu ***
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mmc 0:1
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mmc 0:2
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debian
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nvme 0:1
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ubuntu
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nvme 0:2
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usb 0:2
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U-Boot console
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Default behavior when user exits from the bootmenu
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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User can exit from bootmenu by selecting the last entry
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"U-Boot console"/"Quit" or ESC key.
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When the CONFIG_BOOTMENU_DISABLE_UBOOT_CONSOLE is disabled,
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user exits from the bootmenu and returns to the U-Boot console.
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When the CONFIG_BOOTMENU_DISABLE_UBOOT_CONSOLE is enabled, user can not
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enter the U-Boot console. When the user exits from the bootmenu,
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the bootmenu invokes the following default behavior.
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* if CONFIG_CMD_BOOTEFI_BOOTMGR is enabled, execute "bootefi bootmgr" command
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* "bootefi bootmgr" fails or is not enabled, then execute "run bootcmd" command.
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Configuration
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-------------
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The "bootmenu" command is enabled by::
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CONFIG_CMD_BOOTMENU=y
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To run the bootmenu at startup add these additional settings::
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CONFIG_AUTOBOOT_KEYED=y
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CONFIG_BOOTDELAY=30
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CONFIG_AUTOBOOT_MENU_SHOW=y
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UEFI boot variable enumeration is enabled by::
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CONFIG_CMD_BOOTEFI_BOOTMGR=y
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To improve the product security, entering U-Boot console from bootmenu
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can be disabled by::
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CONFIG_BOOTMENU_DISABLE_UBOOT_CONSOLE=y
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To scan the discoverable devices connected to the buses such as
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USB and PCIe prior to bootmenu showing up, CONFIG_PREBOOT can be
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used to run the command before showing the bootmenu, i.e.::
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CONFIG_USE_PREBOOT=y
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CONFIG_PREBOOT="pci enum; usb start; scsi scan; nvme scan; virtio scan"
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