1，修改dts文件
build/boards/cv180x/cv1800b_milkv_duo_sd/dts_riscv/cv1800b_milkv_duo_sd.dts
添加如下内容：
This is a companion discussion topic for the original entry at http://forum.sophgo.com/t/milk-v-duo-st7789v/160
This is a companion discussion topic for the original entry at http://forum.sophgo.com/t/milk-v-duo-st7789v/160