| .. SPDX-License-Identifier: GPL-2.0+ |
| .. (C) Copyright 2011-2012 Pali Rohรกr <pali@kernel.org> |
| |
| bootmenu command |
| ================ |
| |
| Synopsis |
| -------- |
| :: |
| |
| bootmenu [delay] |
| |
| Description |
| ----------- |
| |
| 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 sequences, 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. |
| |
| UEFI boot variable enumeration |
| '''''''''''''''''''''''''''''' |
| If enabled, the bootmenu command will automatically generate and add |
| UEFI-related boot menu entries for the following items. |
| |
| * possible bootable media with default file names |
| * user-defined UEFI boot options |
| |
| The bootmenu automatically enumerates the possible bootable |
| media devices supporting EFI_SIMPLE_FILE_SYSTEM_PROTOCOL. |
| This auto generated entry is named as "<interface> <devnum>:<part>" format. |
| (e.g. "usb 0:1") |
| |
| The bootmenu displays the UEFI-related menu entries in order of "BootOrder". |
| When the user selects the UEFI boot menu entry, the bootmenu sets |
| the selected boot variable index to "BootNext" without non-volatile attribute, |
| then call the uefi boot manager with the command "bootefi bootmgr". |
| |
| Example bootmenu is as below:: |
| |
| *** U-Boot Boot Menu *** |
| |
| mmc 0:1 |
| mmc 0:2 |
| debian |
| nvme 0:1 |
| ubuntu |
| nvme 0:2 |
| usb 0:2 |
| U-Boot console |
| |
| Default behavior when user exits from the bootmenu |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| User can exit from bootmenu by selecting the last entry |
| "U-Boot console"/"Quit" or ESC/CTRL+C key. |
| |
| When the CONFIG_BOOTMENU_DISABLE_UBOOT_CONSOLE is disabled, |
| user exits from the bootmenu and returns to the U-Boot console. |
| |
| When the CONFIG_BOOTMENU_DISABLE_UBOOT_CONSOLE is enabled, user can not |
| enter the U-Boot console. When the user exits from the bootmenu, |
| the bootmenu invokes the following default behavior. |
| |
| * if CONFIG_CMD_BOOTEFI_BOOTMGR is enabled, execute "bootefi bootmgr" command |
| * "bootefi bootmgr" fails or is not enabled, then execute "run bootcmd" command. |
| |
| Configuration |
| ------------- |
| |
| The "bootmenu" command 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 |
| |
| UEFI boot variable enumeration is enabled by:: |
| |
| CONFIG_CMD_BOOTEFI_BOOTMGR=y |
| |
| To improve the product security, entering U-Boot console from bootmenu |
| can be disabled by:: |
| |
| CONFIG_BOOTMENU_DISABLE_UBOOT_CONSOLE=y |
| |
| To scan the discoverable devices connected to the buses such as |
| USB and PCIe prior to bootmenu showing up, CONFIG_PREBOOT can be |
| used to run the command before showing the bootmenu, i.e.:: |
| |
| CONFIG_USE_PREBOOT=y |
| CONFIG_PREBOOT="pci enum; usb start; scsi scan; nvme scan; virtio scan" |