dts: exynos: snow: Add memory layout description

Add a description of the snow memory layout to assist flashing tools which
want to be able to deal with any exynos image.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/exynos5250-snow.dts

@@ -43,6 +43,59 @@
 		i2s = "/sound@3830000";
 	};
 
+        memory {
+		reg = <0x40000000 0x80000000>;
+	};
+
+	chosen {
+		bootargs = "console=tty1";
+		stdout-path = "serial3:115200n8";
+	};
+
+	iram {
+		reg = <0x02020000 0x60000>;
+	};
+
+	config {
+		samsung,bl1-offset = <0x1400>;
+		samsung,bl2-offset = <0x3400>;
+		u-boot-memory = "/memory";
+		u-boot-offset = <0x3e00000 0x100000>;
+	};
+
+	flash {
+		reg = <0 0x100000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		pre-boot {
+			label = "bl1 pre-boot";
+			reg = <0 0x2000>;
+			read-only;
+			filename = "e5250.nbl1.bin";
+			type = "blob exynos-bl1";
+			required;
+		};
+
+		spl {
+			label = "bl2 spl";
+			reg = <0x2000 0x4000>;
+			read-only;
+			filename = "bl2.bin";
+			type = "blob exynos-bl2 boot,dtb";
+			payload = "/flash/ro-boot";
+			required;
+		};
+
+		ro-boot {
+			label = "u-boot";
+			reg = <0x6000 0x9a000>;
+			read-only;
+			type = "blob boot,dtb";
+			required;
+		};
+	};
+
+
 	i2c4: i2c@12CA0000 {
 		cros_ec_old: cros-ec@1e {
 			reg = <0x1e>;