[U-Boot] [PATCH v2] stm32f4: fix serial output

[kunhuahuang]

This patch fix the serial output.
The source is from Kamil Lulko's "stm32f429-discovery board support"

Thanks, Varcain. I learned a lot.

Signed-off-by: kunhuahuang <huangkunhua at gmail.com>
---
 drivers/serial/serial_stm32.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/serial/serial_stm32.c b/drivers/serial/serial_stm32.c
index 3c80096..8c613db 100644
--- a/drivers/serial/serial_stm32.c
+++ b/drivers/serial/serial_stm32.c
@@ -81,6 +81,10 @@ static int stm32_serial_getc(void)
 static void stm32_serial_putc(const char c)
 {
 	struct stm32_serial *usart = (struct stm32_serial *)USART_BASE;
+
+	if (c == '\n')
+		stm32_serial_putc('\r');
+
 	while ((readl(&usart->sr) & USART_SR_FLAG_TXE) == 0)
 		;
 	writel(c, &usart->dr);
-- 
1.9.1