пт, 5 січ. 2024 р. о 18:03 Caleb Connolly caleb.connolly@linaro.org пише:
With the relatively new button API in U-Boot, it's now much easier to model the common usecase of mapping arbitrary actions to different buttons during boot - for example entering fastboot mode, setting some additional kernel cmdline arguments, or booting with a custom recovery ramdisk, to name a few.
Historically, this functionality has been implemented in board code, making it fixed for a given U-Boot binary and requiring the code be duplicated and modified for every board.
Implement a generic abstraction to run an arbitrary command during boot when a specific button is pressed. The button -> command mapping is configured via environment variables with the following format:
button_cmd_N_name=<button label> button_cmd_N=<command to run>
Where N is the mapping number starting from 0. For example:
button_cmd_0_name=vol_down button_cmd_0=fastboot usb 0
This will cause the device to enter fastboot mode if volume down is held during boot.
After we enter the cli loop the button commands are no longer valid, this allows the buttons to additionally be used for navigating a boot menu.
Signed-off-by: Caleb Connolly caleb.connolly@linaro.org
boot/Kconfig | 14 +++++++ common/Makefile | 1 + common/button_cmd.c | 83 +++++++++++++++++++++++++++++++++++++++ common/main.c | 3 ++ doc/usage/environment.rst | 4 ++ include/button.h | 9 +++++ 6 files changed, 114 insertions(+) create mode 100644 common/button_cmd.c
I wonder how I lived without this patch! I hope to see it in the mainline ASAP.
Tested-by: Svyatoslav Ryhel clamor95@gmail.com # Tegra30