I looked into the OF 64-bit extensions spec, and "cell" is 64- 
bit there.

Like I said before, a "cell" in OF has nothing to do with the items
in the device tree.

So, "address" should look valid. I don't know whether PPC64 boxes  
support 64-bit OF, or only 32-bit, however, the kernel

Most OF's on 64-bit machines are 64 bit.  The only defined client
interface for PowerPC is 32 bit though.  And, again, the format
of the device tree is independent of machine word size or other
environmental factors.

doesn't seem to deal with 64-bit ones correctly, so I'm assuming  
that 32-bit OF is at least available...
   Anyway, I'm still missing the point of not using "address" which  
is clearly intended for such case.

It also has many many problems and therefore should preferably
not be used.


Segher