Improve support for running U-Boot on Qualcomm smartphones, with:
* A boot menu which can be entered by holding power during boot * Hang on panic (so errors can be read on the display) * Serial gadget which can be enabled by holding volume down or via boot menu
In its current form, U-Boot's boot menu is perfectly adequate, however once an option is picked U-Boot will just drop to the CLI again.
On a phone (with no keyboard), dropping to the CLI effectively makes the device unusable until manually rebooted, since there is no way to run any commands...
To rectify this, let's revive CONFIG_BOOT_RETRY for the hush parser and make it run the contents of "bootcmd", as well as re-reading the value of the bootretry environment variable. In tandem, this provides for a flexible menu system which we can enter and exit. See qcom-phone.env in patch 1 for more details.
Finally, provide some rough-ish documentation to describe how Qualcomm phone support works and outline some debugging steps for when UART and the framebuffer are unavailable.
This series depends on CONFIG_REMAP_PHONE_KEYS [1] to enable navigating the boot menu when using upstream DT.
[1]: https://lore.kernel.org/u-boot/20240714194948.1271135-1-caleb.connolly@linar...
--- Caleb Connolly (4): board/qualcomm: introduce phone config cli_hush: run bootmenu on retry bootretry: check for bootretry variable changes doc: board/qualcomm: describe phone support and bringup
board/qualcomm/qcom-phone.config | 12 ++++ board/qualcomm/qcom-phone.env | 49 ++++++++++++++++ boot/bootretry.c | 2 + common/cli_hush.c | 2 +- common/cli_hush_upstream.c | 2 +- doc/board/qualcomm/board.rst | 5 ++ doc/board/qualcomm/index.rst | 1 + doc/board/qualcomm/phones.rst | 122 +++++++++++++++++++++++++++++++++++++++ 8 files changed, 193 insertions(+), 2 deletions(-) --- change-id: 20240831-qcom-phones-c789d14de657 base-commit: f0ec3e608902ca1f573e5b7017da6bc804483f55
// Caleb (they/them)