According to rk3328 TRM: 0~0xff000000 is ddr space; 0xff000000~0xffffffff is device space. Signed-off-by: Kever Yang <kever.yang@rock-chips.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>