strange dtc errors after adding sram node

[info@lategoodbye.de (Stefan Wahren)]

Hi,

i want to add an sram node to arch/arm/boot/dts/imx28.dtsi. According to 
the reference manual [1] the On-Chip RAM is connected to AHB, start 
address 0 and has a size of 128 KB.

So i modified the imx28.dtsi based on the patch below. Unfortunately the 
dtc give me some strang errors:

ERROR (duplicate_label): Duplicate label 'mac0' on 
/ahb at 80080000/ethernet at 800f0000 and /ahb at 00000000/ethernet at 800f0000
ERROR: Input tree has errors, aborting (use -f to force output)

What's wrong with my patch or does it reveal another issue?

Regards
Stefan

[1] - http://cache.freescale.com/files/dsp/doc/ref_manual/MCIMX28RM.pdf
i.MX28 Applications Processor Reference Manual, Rev. 2, 08/2013
Chapter 4.1 Memory Map Overview

-------------------------->8---------------------------------------
--- a/arch/arm/boot/dts/imx28.dtsi
+++ b/arch/arm/boot/dts/imx28.dtsi
@@ -1311,13 +1311,18 @@
  		};
  	};

-	ahb at 80080000 {
+	ahb at 00000000 {
  		compatible = "simple-bus";
  		#address-cells = <1>;
  		#size-cells = <1>;
-		reg = <0x80080000 0x80000>;
+		reg = <0x00000000 0x20000>, <0x80080000 0x80000>;
  		ranges;

+		ocram: sram at 00000000 {
+			compatible = "mmio-sram";
+			reg = <0x00000000 0x20000>;
+		};
+
  		usb0: usb at 80080000 {
  			compatible = "fsl,imx28-usb", "fsl,imx27-usb";
  			reg = <0x80080000 0x10000>;