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>

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>
Simon Glass
1 parent 0e977bc145
Showing 2 changed files with 17 additions and 0 deletions Side-by-side Diff
drivers/serial/Kconfig
include/debug_uart.h
@@ -120,6 +120,16 @@
 	  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
@@ -105,6 +105,12 @@
  */
 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 @@
 	{ \
 		board_debug_uart_init(); \
 		_debug_uart_init(); \
+		_DEBUG_UART_ANNOUNCE \
 	} \
  
 #endif
...	...	@@ -120,6 +120,16 @@
120	120	here that is needed to set up the UART ready for use, such as set
121	121	pin multiplexing or enable clocks.
122	122
	123	+config DEBUG_UART_ANNOUNCE
	124	+ bool "Show a message when the debug UART starts up"
	125	+ depends on DEBUG_UART
	126	+ help
	127	+ Enable this option to show a message when the debug UART is ready
	128	+ for use. You will see a message like "<debug_uart> " as soon as
	129	+ U-Boot has the UART ready for use (i.e. your code calls
	130	+ debug_uart_init()). This can be useful just as a check that
	131	+ everything is working.
	132	+
123	133	config ROCKCHIP_SERIAL
124	134	bool "Rockchip on-chip UART support"
125	135	depends on ARCH_ROCKCHIP && DM_SERIAL
...	...	@@ -105,6 +105,12 @@
105	105	*/
106	106	void printhex8(uint value);
107	107
	108	+#ifdef CONFIG_DEBUG_UART_ANNOUNCE
	109	+#define _DEBUG_UART_ANNOUNCE printascii("<debug_uart> ");
	110	+#else
	111	+#define _DEBUG_UART_ANNOUNCE
	112	+#endif
	113	+
108	114	/*
109	115	* Now define some functions - this should be inserted into the serial driver
110	116	*/
...	...	@@ -151,6 +157,7 @@
151	157	{ \
152	158	board_debug_uart_init(); \
153	159	_debug_uart_init(); \
	160	+ _DEBUG_UART_ANNOUNCE \
154	161	} \
155	162
156	163	#endif