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From: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: [PATCH v2 6/7] Holly DTS
Date: Wed, 9 May 2007 17:28:18 +0200
To: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Cc: Olof Johansson <olof@lixom.net>, linuxppc-dev@ozlabs.org,
	Loeliger Jon-LOELIGER <jdl@Freescale.com>,
	David Gibson <david@gibson.dropbear.id.au>
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>>>>> Other dts'es are similar. Could be nice
>>>>> to have a comment next to it if that's the case.
>>>>
>>>> Yeah.  There's also this ?? syntax now I believe.
>>>
>>> Not quite yet.
>>
>> Yes, the idea was raised, but discussion kind of petered out and
>> nobody (read: me) got around to implementing it.
>
> What exactly did this ?? syntax imply?  I must have missed that thread.

A property in a DTS file can use that to say
the property should have a value, but it will
be filled in by the bootwrapper instead (memory
address/size, or network MAC address, for
instance).  Presumably the kernel parser would
complain when it sees the this-is-still-undefined
marker.

The original proposal specified the length of
the property value IIRC, but that isn't necessary
anymore.


Segher