Hello Simon, hello Philipp, since patch Merge tag 'for-master-20190201' of git://git.denx.de/u-boot-rockchip e5fd39c886485e3dec77f4438a6e364c2987cf5f booting on the Tinker Board (tinker-rk3288_defconfig) is broken. There is not even any UART output from SPL. Best regards Heinrich