You will also like to see https://github.com/lgs2007m/cdt-gpt-ipq60xx-generate
u-boot-2016 source code base on https://github.com/gl-inet/uboot-ipq60xx
PS: The mbn scripts run with python2.7, you should install and switch to python2.7.
git clone https://github.com/lgs2007m/uboot-ipq60xx-build
cd uboot-ipq60xx-build/
./build.sh
The uboot binary will be: uboot-ipq60xx-build/u-boot.mbn
The uboot failsafe HTTP server ip: 192.168.1.1