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The RAM_ROCKCHIP_DEBUG can be used only if DEBUG_UART is available. The next commit introduces changes in definition of debug uart functions, so that DEBUG_UART is required to be defined in order to initialize uart and use print functions. Signed-off-by: Lukasz Czechowski <lukasz.czechowski@thaumatec.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com> Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>