To use the debug UART we have to call debug_uart_init() in the SPL. Do so as soon as possible.
As an example, here is how you can use it on a LS1028A SoC: CONFIG_DEBUG_UART=y CONFIG_DEBUG_UART_BASE=0x21c0500 CONFIG_DEBUG_UART_CLOCK=200000000
Signed-off-by: Michael Walle michael@walle.cc --- arch/arm/cpu/armv8/fsl-layerscape/spl.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/spl.c b/arch/arm/cpu/armv8/fsl-layerscape/spl.c index d5131bcf4b..888c02f6c5 100644 --- a/arch/arm/cpu/armv8/fsl-layerscape/spl.c +++ b/arch/arm/cpu/armv8/fsl-layerscape/spl.c @@ -6,6 +6,7 @@ #include <common.h> #include <clock_legacy.h> #include <cpu_func.h> +#include <debug_uart.h> #include <env.h> #include <image.h> #include <init.h> @@ -70,6 +71,8 @@ void board_init_f(ulong dummy) icache_enable(); /* Clear global data */ memset((void *)gd, 0, sizeof(gd_t)); + if (IS_ENABLED(CONFIG_DEBUG_UART)) + debug_uart_init(); board_early_init_f(); timer_init(); #ifdef CONFIG_ARCH_LS2080A