RK_BUILDROOT_BASE_CFG="OK3568-UP4"
RK_WIFIBT_TTY="ttyS8"
RK_KERNEL_CFG="OK-x-U40-linux_defconfig"
RK_KERNEL_VERSION="5.10"
RK_KERNEL_DTS_NAME="OK-x-U40-linux"
RK_PARAMETER="parameter-buildroot-fit.txt"
RK_USE_FIT_IMG=y