按照https://developer.canaan-creative.com/k230_canmv/zh/v1.0/zh/userguide/how_to_build.html 编译k230d的固件，提示please run command: make prepare_toolchain,但是/opt/toolchain里是有编译链的链接的
按照https://developer.canaan-creative.com/k230_canmv/zh/v1.0/zh/userguide/how_to_build.html 编译k230d的固件，提示please run command: make prepare_toolchain,但是/opt/toolchain里是有编译链的链接的
