1RK_YOCTO_CFG="rockchip-rk3568-evb" 2RK_ROOTFS_SYSTEM_UBUNTU=y 3RK_WIFIBT_TTY="ttyS8" 4RK_KERNEL_VERSION="5.10" 5RK_KERNEL_DTS_NAME="OK3568-C-linux" 6RK_PARAMETER="parameter-ubuntu-fit.txt" 7RK_USE_FIT_IMG=y 8