Bouffalo Lab BL808
BL808 Block Diagram
OpenBouffalo BL808 Linux Build
mkdir buildroot_bouffalo && cd buildroot_bouffalo git clone https://github.com/buildroot/buildroot git clone https://github.com/openbouffalo/buildroot_bouffalo export BR_BOUFFALO_OVERLAY_PATH=$(pwd)/buildroot_bouffalo cd buildroot make BR2_EXTERNAL=$BR_BOUFFALO_OVERLAY_PATH pine64_ox64_defconfig make
The board is somewhat confusing as it contains two mcu's. The actual module is a BL808 but there is also a BL702 which acts like a debug and usb-uart. The UART USB port is connected to the BL701 and provides serial interfaces. The OTG port is connected directly to the BL808.
The boot button can be used to boot either of the MCU's into firmware update mode. Press and hold while connecting the power and the BL702 can be flashed. Press and hold boot while pressing reset and the BL808 is starting in firmware update mode.