Index: kernel/genarch/src/drivers/am335x/uart.c
===================================================================
--- kernel/genarch/src/drivers/am335x/uart.c	(revision 30c87234a1446e3a6c464eea6a105f5b4f7ce46c)
+++ kernel/genarch/src/drivers/am335x/uart.c	(revision c0948aaab67a4b34884ff72cfed5c68b05c9ba0d)
@@ -146,5 +146,6 @@
 
 	/* Enable the UART module */
-	uart->regs->mdr1 &= AM335x_UART_MDR_MS_UART16;
+	uart->regs->mdr1 &= (AM335x_UART_MDR_MS_UART16 &
+	    ~AM335x_UART_MDR_MS_MASK);
 
 	/* Disable interrupts */