1RK_BUILDROOT_BASE_CFG="OK3568-UP4" 2RK_WIFIBT_TTY="ttyS8" 3RK_KERNEL_CFG="OK-x-U40-linux_defconfig" 4RK_KERNEL_VERSION="5.10" 5RK_KERNEL_DTS_NAME="OK-x-U40-linux" 6RK_PARAMETER="parameter-buildroot-fit.txt" 7RK_USE_FIT_IMG=y 8