微處理器 - Rockchip RK3399 (NanoPi NEO4) - Build xrock

參考資訊：
https://github.com/xboot/xrock
https://sources.buildroot.net/rockchip-rkbin/git/bin/rk35/

步驟如下：

$ cd
$ git clone https://github.com/xboot/xrock
$ cd xrock
$ make -j4
$ sudo make install