From c7fefcb9125bbd183dc095996c6747273043d988 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Sun, 18 Oct 2015 19:51:25 -0600
Subject: [PATCH] debug_uart: Add an option to announce the debug UART
It is useful to see a message from the debug UART early during boot so that
you know things are working. Add an option to enable this. The message will
be displayed as soon as debug_uart_init() is called.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
---
drivers/serial/Kconfig | 10 ++++++++++
include/debug_uart.h | 7 +++++++
2 files changed, 17 insertions(+)
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 39f65007c9..ac5920ad5a 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -120,6 +120,16 @@ config DEBUG_UART_BOARD_INIT
here that is needed to set up the UART ready for use, such as set
pin multiplexing or enable clocks.
+config DEBUG_UART_ANNOUNCE
+ bool "Show a message when the debug UART starts up"
+ depends on DEBUG_UART
+ help
+ Enable this option to show a message when the debug UART is ready
+ for use. You will see a message like "<debug_uart> " as soon as
+ U-Boot has the UART ready for use (i.e. your code calls
+ debug_uart_init()). This can be useful just as a check that
+ everything is working.
+
config ROCKCHIP_SERIAL
bool "Rockchip on-chip UART support"
depends on ARCH_ROCKCHIP && DM_SERIAL
diff --git a/include/debug_uart.h b/include/debug_uart.h
index a6b7ce8e6e..5d5349bbd2 100644
--- a/include/debug_uart.h
+++ b/include/debug_uart.h
@@ -105,6 +105,12 @@ void printhex4(uint value);
*/
void printhex8(uint value);
+#ifdef CONFIG_DEBUG_UART_ANNOUNCE
+#define _DEBUG_UART_ANNOUNCE printascii("<debug_uart> ");
+#else
+#define _DEBUG_UART_ANNOUNCE
+#endif
+
/*
* Now define some functions - this should be inserted into the serial driver
*/
@@ -151,6 +157,7 @@ void printhex8(uint value);
{ \
board_debug_uart_init(); \
_debug_uart_init(); \
+ _DEBUG_UART_ANNOUNCE \
} \
#endif
--
2.39.5