Getting the Sources
The rockchip linux SDK source tree is located in multi Git repository hosted by Github.
The SDK uses repo to sync down source code.
Create an empty directory to hold your working files
mkdir rk-buildroot-bsp cd rk-buildroot-bsp
To initialize Buildroot SDK source tree
repo init --repo-url=https://github.com/rockchip-linux/repo -u https://github.com/rockchip-linux/manifests -b buildroot repo sync
Build buildroot rootfs
You can use following integrative cmds and scripts to build firmware:
cd buildroot && make rockchip_rk3399_defconfig && cd .. && ./build_all.sh && ./mkfirmware.sh
Generate the rootfs.img in out/ directory.