On 05/22/2013 05:43 PM, Sebastian Hesselbarth wrote:

On 05/21/2013 07:48 PM, Andrew Lunn wrote:

quoted

On Tue, May 21, 2013 at 06:41:44PM +0200, Sebastian Hesselbarth wrote:

quoted

This patch adds orion-eth and mvmdio device tree nodes for DT enabled
Dove boards. As there is only one ethernet controller on Dove, a default
phy node is also added with a note to set its reg property on a per-board
basis.

Signed-off-by: Sebastian Hesselbarth<sebastian.hesselbarth@gmail.com>
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...

quoted

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+            ethernet-port at 0 {
+                device_type = "network";
+                compatible = "marvell,orion-eth-port";
+                reg =<0>;
+                interrupts =<29>;
+                /* overwrite MAC address in bootloader */
+                local-mac-address = [00 00 00 00 00 00];

Hi Sebastian

Its probably a good idea to set the local administration bit in this
MAC address. i.e. first byte is 02.

Andrew,

we just need an invalid address here to trigger the default behavior of
the driver and load the MAC address from its register. As PPC binding
documentation also has all zero, I just took it.

The truth is in PPC case, often we set the real mac address with some variables 
like 'eth[x]addr' in u-boot prompt, then u-boot will parse that value to fill 
the dtb. At last the associated driver can get the actual mac address from the 
dtb. And especially for those older u-boot version, even you have to reset the 
'local-mac-address' property in dts directly with the real mac address before 
generate the dtb since the older u-boot have no this ability to fill dtb again 
before pass the kernel.

Tiejun