diff --git a/arch/arm/mach-s3c2416/mach-smdk2416.c b/arch/arm/mach-s3c2416/mach-smdk2416.c
index ad2497c4cf3..3f83177246c 100644
--- a/arch/arm/mach-s3c2416/mach-smdk2416.c
+++ b/arch/arm/mach-s3c2416/mach-smdk2416.c
@@ -111,6 +111,13 @@ static struct s3c2410_uartcfg smdk2416_uartcfgs[] __initdata = {
 		.ucon	     = UCON,
 		.ulcon	     = ULCON | 0x50,
 		.ufcon	     = UFCON,
+	},
+	[3] = {
+		.hwport	     = 3,
+		.flags	     = 0,
+		.ucon	     = UCON,
+		.ulcon	     = ULCON,
+		.ufcon	     = UFCON,
 	}
 };
 
diff --git a/arch/arm/mach-s3c2443/mach-smdk2443.c b/arch/arm/mach-s3c2443/mach-smdk2443.c
index d3b2922517e..514275e43ca 100644
--- a/arch/arm/mach-s3c2443/mach-smdk2443.c
+++ b/arch/arm/mach-s3c2443/mach-smdk2443.c
@@ -99,6 +99,13 @@ static struct s3c2410_uartcfg smdk2443_uartcfgs[] __initdata = {
 		.ucon	     = 0x3c5,
 		.ulcon	     = 0x43,
 		.ufcon	     = 0x51,
+	},
+	[3] = {
+		.hwport	     = 3,
+		.flags	     = 0,
+		.ucon	     = 0x3c5,
+		.ulcon	     = 0x03,
+		.ufcon	     = 0x51,
 	}
 };