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debug_uart: Add an option to announce the debug UART

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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>
This commit is contained in:
Simon Glass 2015-10-18 19:51:25 -06:00
parent 0e977bc145
commit c7fefcb912
2 changed files with 17 additions and 0 deletions
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10
drivers/serial/Kconfig
View file

@ -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

7
include/debug_uart.h
View file

@ -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