Re: [PATCH v1 1/5] ARM: imx28: add basic dt support

[Lothar WaÃmann]

Hi,

Dong Aisheng writes:
> On Wed, Mar 14, 2012 at 10:16:43PM +0800, s.hauer@xxxxxxxxxxxxxx wrote:
> > On Wed, Mar 14, 2012 at 08:45:23PM +0800, Dong Aisheng wrote:
> > > On Wed, Mar 14, 2012 at 01:23:51AM +0800, Grant Likely wrote:
[...]
> > > But it seems this needs pass mac address to fec driver via platforom data which is
> > > not friendly to dt.
> > > 
> > > Another way may be changing fec driver to get the fixed part of mac address(first
> > > two bytes) from device tree and read the left dynamical part from otp which i'm not
> > > sure is better enough.
> > > 
> > > BTW, filling with zeros seems not work since it's invalid mac address.
> > 
> > Yes, that's the idea of using this value...
> > 
> But comparing to use an invalid value, why not just do not define that
> local-mac-address property?
> 
Because a MAC address is by definition a GLOBALLY UNIQUE IDENTIFIER
which is contrary to coding a "valid" default value for it somewhere!
The owner of a certain MAC address range (OUI) is responsible for
ensuring the uniqueness. Thus only they may assign a specific MAC
address to a specific device.


Lothar WaÃmann
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