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Subject: Re: mac-address vs. local-mac-address
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Timur Tabi <timur@freescale.com>
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> Without a firmware device tree, there's no way to update the device tree and 
> have that new tree retained over a reboot.

I don't think it was ever question to update it over reboot...
mac-address is a runtime property that is lost at reboot, at least
that's my understanding of the OF behaviour. That's where your confusion
is.

Ben.