--- wikisrc/ports/evbarm/allwinner.mdwn	2014/10/20 15:46:50	1.16
+++ wikisrc/ports/evbarm/allwinner.mdwn	2014/10/20 16:03:56	1.17
@@ -73,3 +73,14 @@ To build a big endian release (or sets) 
 ./build.sh -m evbearmv7hf-eb 
 """]]
 where -eb means endianness big, hf is hardware floating point support, and earm is the modern "extended" ABI for ARM CPUs, and finally v7 is version 7 of the supported instruction set.
+
+# Board specific notes
+
+## Merrii Hummingbird A31
+
+There doesn't appear to be a meaningful way to generate a MAC address on these boards. U-Boot from the A31 SDK and from the u-boot-sunxi tree both lack GMAC support, and the Security ID registers (at 0x01c23800) appear to be empty.
+
+To overcome this, you can specify your own MAC address in *uEnv.txt*:
+[[!template  id=programlisting text="""
+bootargs=root=ld0a awge0.mac-address=02:a0:3d:88:1a:1e
+"""]]