The TF-A sets up pin muxing and clocking for the UART4 which is the UART
suggested by ST for use as debug console.
Eventually, we might want to do this ourselves to be sure, but for now
lets just stick in a putc_ll('>'), so user selecting DEBUG_LL can see
that barebox started.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
arch/arm/boards/stm32mp157c-dk2/lowlevel.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/arm/boards/stm32mp157c-dk2/lowlevel.c b/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
index 566ace79c956..2106eaadc93a 100644
--- a/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
+++ b/arch/arm/boards/stm32mp157c-dk2/lowlevel.c
@@ -7,12 +7,21 @@
extern char __dtb_z_stm32mp157c_dk2_start[];
+static void setup_uart(void)
+{
+ /* first stage has set up the UART, so nothing to do here */
+ putc_ll('>');
+}
+
ENTRY_FUNCTION(start_stm32mp157c_dk2, r0, r1, r2)
{
void *fdt;
arm_cpu_lowlevel_init();
+ if (IS_ENABLED(CONFIG_DEBUG_LL))
+ setup_uart();
+
fdt = __dtb_z_stm32mp157c_dk2_start + get_runtime_offset();
barebox_arm_entry(STM32_DDR_BASE, SZ_512M, fdt);
--
2.24.0.rc1
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