Rockchip hasn't release yet the TF-A arm-trusted-firmware sources for rk3568, that is used by OpenWrt in u-boot https://github.com/ARM-software/arm-trusted-firmware/tree/master/plat/rockchip, time is unkown https://lore.kernel.org/linux-arm-kernel/YnPdgUvEvitCPbfG@e120937-lin/T/