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Subject[PATCH v3 4/4] ARM: debug: stm32: add UART early console support for STM32MP1
Add support of early console for STM32MP1. Default UART instance is UART4,
but other UART instances can be configured by setting physical and virtual
base addresses in menuconfig.

Signed-off-by: Erwan Le Ray <>

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index e5e1703a89c0..3357e294a7cc 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -1235,6 +1235,18 @@ choice

If unsure, say N.

+ config STM32MP1_DEBUG_UART
+ bool "Use STM32MP1 UART for low-level debug"
+ depends on MACH_STM32MP157
+ select DEBUG_STM32_UART
+ help
+ Say Y here if you want kernel low-level debugging support
+ on STM32MP1 based platforms, wich default UART is wired on
+ UART4, but another UART instance can be selected by modifying
+ If unsure, say N.
bool "Kernel low-level debugging messages via Tegra UART via ODMDATA"
depends on ARCH_TEGRA
@@ -1633,6 +1645,7 @@ config DEBUG_UART_PHYS
default 0x3e000000 if DEBUG_BCM_KONA_UART
default 0x3f201000 if DEBUG_BCM2836
default 0x4000e400 if DEBUG_LL_UART_EFM32
+ default 0x40010000 if STM32MP1_DEBUG_UART
default 0x40011000 if STM32F4_DEBUG_UART || STM32F7_DEBUG_UART || \
default 0x40028000 if DEBUG_AT91_SAMV7_USART1
@@ -1795,6 +1808,7 @@ config DEBUG_UART_VIRT
default 0xfcfe8600 if DEBUG_BCM63XX_UART
default 0xfd000000 if DEBUG_SPEAR3XX || DEBUG_SPEAR13XX
default 0xfd883000 if DEBUG_ALPINE_UART0
+ default 0xfe010000 if STM32MP1_DEBUG_UART
default 0xfe017000 if DEBUG_MMP_UART2
default 0xfe018000 if DEBUG_MMP_UART3
default 0xfe100000 if DEBUG_IMX23_UART || DEBUG_IMX28_UART
diff --git a/arch/arm/include/debug/stm32.S b/arch/arm/include/debug/stm32.S
index 5a2e2b065340..f3c4a37210ed 100644
--- a/arch/arm/include/debug/stm32.S
+++ b/arch/arm/include/debug/stm32.S
@@ -9,7 +9,8 @@
#define STM32_USART_TDR_OFF 0x04

-#if defined(CONFIG_STM32F7_DEBUG_UART) || defined(CONFIG_STM32H7_DEBUG_UART)
+#if defined(CONFIG_STM32F7_DEBUG_UART) || defined(CONFIG_STM32H7_DEBUG_UART) || \
#define STM32_USART_SR_OFF 0x1C
#define STM32_USART_TDR_OFF 0x28
 \ /
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