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CONFIG_VAL(DEBUG_UART_BASE) expands to CONFIG_DEBUG_UART_BASE or CONFIG_SPL_DEBUG_UART_BASE or CONFIG_TPL_DEBUG_UART_BASE and allows boards to set different values for SPL, TPL and U-Boot Proper. For ns16550 driver this support is there since commit d293759d55cc ("serial: ns16550: Add support for SPL_DEBUG_UART_BASE"). Signed-off-by: Pali Rohár <pali@kernel.org>