stm32mp1: Allow to activate CONFIG_DEBUG_UART
Add the needed information to enable the debug uart
to have printf before the serial driver probe
(so before probe for clock, pincontrol and reset drivers)
To enable the debug on uart 4 (default console):
+ CONFIG_DEBUG_UART=y
+ CONFIG_DEBUG_UART_STM32=y
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index ccbeb5c..abceede 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -54,4 +54,19 @@
source "board/st/stm32mp1/Kconfig"
+# currently activated for debug / should be deactivated for real product
+if DEBUG_UART
+
+config DEBUG_UART_BOARD_INIT
+ default y
+
+# debug on UART4 by default
+config DEBUG_UART_BASE
+ default 0x40010000
+
+# clock source is HSI on reset
+config DEBUG_UART_CLOCK
+ default 64000000
+endif
+
endif
diff --git a/arch/arm/mach-stm32mp/cpu.c b/arch/arm/mach-stm32mp/cpu.c
index dfcbbd2..2deee09 100644
--- a/arch/arm/mach-stm32mp/cpu.c
+++ b/arch/arm/mach-stm32mp/cpu.c
@@ -4,6 +4,7 @@
*/
#include <common.h>
#include <clk.h>
+#include <debug_uart.h>
#include <asm/io.h>
#include <asm/arch/stm32.h>
#include <asm/arch/sys_proto.h>
@@ -152,6 +153,8 @@
*/
int arch_cpu_init(void)
{
+ u32 boot_mode;
+
/* early armv7 timer init: needed for polling */
timer_init();
@@ -160,8 +163,17 @@
security_init();
#endif
+
/* get bootmode from BootRom context: saved in TAMP register */
- get_bootmode();
+ boot_mode = get_bootmode();
+
+ if ((boot_mode & TAMP_BOOT_DEVICE_MASK) == BOOT_SERIAL_UART)
+ gd->flags |= GD_FLG_SILENT | GD_FLG_DISABLE_CONSOLE;
+#if defined(CONFIG_DEBUG_UART) && \
+ (!defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD))
+ else
+ debug_uart_init();
+#endif
return 0;
}
diff --git a/arch/arm/mach-stm32mp/include/mach/stm32.h b/arch/arm/mach-stm32mp/include/mach/stm32.h
index a814201..129f9f5 100644
--- a/arch/arm/mach-stm32mp/include/mach/stm32.h
+++ b/arch/arm/mach-stm32mp/include/mach/stm32.h
@@ -17,6 +17,18 @@
#define STM32_ETZPC_BASE 0x5C007000
#define STM32_TAMP_BASE 0x5C00A000
+#ifdef CONFIG_DEBUG_UART_BASE
+/* hardcoded value can be only used for DEBUG UART */
+#define STM32_USART1_BASE 0x5C000000
+#define STM32_USART2_BASE 0x4000E000
+#define STM32_USART3_BASE 0x4000F000
+#define STM32_UART4_BASE 0x40010000
+#define STM32_UART5_BASE 0x40011000
+#define STM32_USART6_BASE 0x44003000
+#define STM32_UART7_BASE 0x40018000
+#define STM32_UART8_BASE 0x40019000
+#endif
+
#define STM32_SYSRAM_BASE 0x2FFC0000
#define STM32_SYSRAM_SIZE SZ_256K