diff --git a/drivers/serial/serial_mvebu_a3700.c b/drivers/serial/serial_mvebu_a3700.c
index 52dc3fdad7b458be076f0d8dc2dda7455854ce33..6bca8e4b7e2d466290da292116f89fb5aa6a895b 100644
--- a/drivers/serial/serial_mvebu_a3700.c
+++ b/drivers/serial/serial_mvebu_a3700.c
@@ -305,6 +305,7 @@ U_BOOT_DRIVER(serial_mvebu) = {
 #ifdef CONFIG_DEBUG_MVEBU_A3700_UART
 
 #include <debug_uart.h>
+#include <mach/soc.h>
 
 static inline void _debug_uart_init(void)
 {
@@ -322,7 +323,8 @@ static inline void _debug_uart_init(void)
 	 * Calculate divider
 	 * baudrate = clock / 16 / divider
 	 */
-	parent_rate = get_ref_clk() * 1000000;
+	parent_rate = (readl(MVEBU_REGISTER(0x13808)) & BIT(9)) ?
+		      40000000 : 25000000;
 	divider = DIV_ROUND_CLOSEST(parent_rate, CONFIG_BAUDRATE * 16);
 	writel(divider, base + UART_BAUD_REG);