Some boards with Allwinner SoCs feature a "FEL" key, sometimes also labelled "uboot", which allows to easily enter the BootROM FEL mode, when pressed upon power-on or reset. This allows to access the USB-OTG boot protocol, for convenient access to memory and uploading code.
Add a software emulation of this functionality for boards without a button connected to this special SoC pin, to give easy FEL access to more boards. Any GPIO can be used, as long as the button uses active-low logic. This is used on the X96 Mate TV box, where the hidden "update" button is actually just some GPIO, checked by the vendor firmware. Please have a look! Cheers, Andre Changelog v1 .. v2: - add patch to fix return_to_fel() prototype - document signal needs to be active-low - activate internal pull-up resistors - add patch to activate button on the X96 Mate TV box Andre Przywara (3): sunxi: fix return_to_fel() prototype sunxi: add "fake" FEL pin support sunxi: x96_mate: Add "fake" FEL key definition arch/arm/include/asm/arch-sunxi/sys_proto.h | 4 +-- arch/arm/mach-sunxi/Kconfig | 10 +++++++ arch/arm/mach-sunxi/board.c | 31 +++++++++++++++++++++ configs/x96_mate_defconfig | 1 + 4 files changed, 44 insertions(+), 2 deletions(-) -- 2.46.3
