So far standard boot lacks a boot menu, although it is possible to create a rudimentary one using the existing 'bootmenu' command.
Even then, this text-based menu offer only basic functionality and does not take full advantage of the displays which are common on many devices.
This series provides a 'bootflow menu' command which allows the user to select from the available bootflows. An attempt is made to show the name of the available operating systems, by reading more information into the bootflow. A logo can be read also, where supported, so that this can be presented to the user when an option is highlighted.
Full use is made of TrueType fonts, if enabled. For cases where only a serial console is available, it falls back to a simple text-based menu.
All of this is implementing using a new 'expo' construct, a collection of scenes (like menu screens) which can be navigated by the user to view information and select option. This is fairly general and should be able to cope with a wider array of use cases, with less hacking of the menu code, such as is currently needed for CMD_BOOTEFI_BOOTMGR.
Of course it would be possible to enhance the existing menu rather than creating a new setup. Instead it seems better to make the existing menu use expo, if code space permits. It avoids the event-loop problem and should be more extensible, given its loosely coupled components and use of IDs instead of pointers. Further motivation is provided in the documentation.
For now the CLI keypress-decoding code is split out to be used by the new menu. The key codes defined by menu.h are reused also.
This is of course just a starting point. Some ideas for future work are included in the documentation.
Simon Glass (24): sandbox: Enable mmc command and legacy images cli: Move readline character-processing to a state machine bootmenu: Add a few comments menu: Rename KEY_... to BKEY_... menu: Update bootmenu_autoboot_loop() to return the code menu: Update bootmenu_loop() to return the code menu: Use a switch statement menu: Make use of CLI character processing image: Add a function to find a script in an image video: Enable VIDEO_ANSI by default only with EFI video: truetype: Rename the metrics function video: Fix unchnaged typo video: Add font functions to the vidconsole API bootstd: Read the Operating System name for distro/scripts bootstd: Allow reading a logo for the OS menu: Factor out menu-keypress decoding expo: Add basic implementation expo: Add support for scenes expo: Add support for scene menus expo: Add basic tests bootstd: Support creating a boot menu bootstd: Add a test for the bootstd menu bootstd: Support setting a theme for the menu expo: Add documentation
arch/sandbox/dts/test.dts | 11 + boot/Kconfig | 12 + boot/Makefile | 3 + boot/bootflow.c | 1 + boot/bootflow_internal.h | 37 ++ boot/bootflow_menu.c | 281 ++++++++++++++ boot/bootmeth-uclass.c | 69 +++- boot/bootmeth_distro.c | 36 ++ boot/bootmeth_script.c | 38 ++ boot/bootstd-uclass.c | 2 + boot/expo.c | 133 +++++++ boot/scene.c | 385 +++++++++++++++++++ boot/scene_internal.h | 123 ++++++ boot/scene_menu.c | 372 ++++++++++++++++++ cmd/bootflow.c | 44 ++- cmd/bootmenu.c | 19 +- cmd/eficonfig.c | 38 +- cmd/font.c | 6 +- cmd/source.c | 173 +++++---- common/Makefile | 6 +- common/cli_getch.c | 208 ++++++++++ common/cli_readline.c | 150 ++------ common/menu.c | 157 ++++---- configs/sandbox_defconfig | 2 + configs/sandbox_flattree_defconfig | 2 + configs/snow_defconfig | 4 + configs/tools-only_defconfig | 2 + doc/develop/expo.rst | 184 +++++++++ doc/develop/index.rst | 1 + drivers/video/Kconfig | 7 +- drivers/video/console_truetype.c | 35 +- drivers/video/vidconsole-uclass.c | 33 ++ include/bootflow.h | 40 ++ include/bootmeth.h | 16 + include/bootstd.h | 4 + include/cli.h | 74 ++++ include/expo.h | 474 +++++++++++++++++++++++ include/image.h | 13 + include/menu.h | 77 +++- include/video.h | 2 +- include/video_console.h | 63 ++- test/boot/Makefile | 2 + test/boot/bootflow.c | 130 +++++++ test/boot/expo.c | 510 +++++++++++++++++++++++++ test/py/tests/bootstd/armbian.bmp.xz | Bin 0 -> 1384 bytes test/py/tests/bootstd/mmc4.img.xz | Bin 0 -> 7072 bytes test/py/tests/test_android/test_avb.py | 2 + test/py/tests/test_ut.py | 216 ++++++++++- 48 files changed, 3813 insertions(+), 384 deletions(-) create mode 100644 boot/bootflow_internal.h create mode 100644 boot/bootflow_menu.c create mode 100644 boot/expo.c create mode 100644 boot/scene.c create mode 100644 boot/scene_internal.h create mode 100644 boot/scene_menu.c create mode 100644 common/cli_getch.c create mode 100644 doc/develop/expo.rst create mode 100644 include/expo.h create mode 100644 test/boot/expo.c create mode 100644 test/py/tests/bootstd/armbian.bmp.xz create mode 100644 test/py/tests/bootstd/mmc4.img.xz