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Date: Fri, 12 Jun 2009 10:29:27 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 3/4] Stellaris machine config
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To: Jamie Lokier <jamie@shareable.org>
Cc: qemu-devel@nongnu.org, M P <buserror@gmail.com>, Paul Brook <paul@codesourcery.com>

> I guess FDT is missing a "#include" equivalent, and possibly name
> constants.

See: 
http://git.jdl.com/gitweb/?p=dtc.git;a=blob;f=Documentation/manual.txt;h=f8a8a7b482e3a2a1501614c94fa0ea87aeb3a9e7;hb=HEAD

There is:

/include/ "filename"

> But for QEMU, some way to give names to, say, a standard SoC or a
> basic board, or a PC without peripherals, and then refer to them in
> another FDT tree, would be useful.

Yes, that must be solved somehow.  Just punting the issue to the vm 
management software isn't acceptable IMHO.

I'm not sure includes will solve that issue.  What we need is more a 
tree merge, i.e. you could have basic config files for a few pc variants 
without devices (i.e. isapc, pc) and config files snippets for devices 
(ide interface foo, sound card bar, ...).  Then you need some way to 
merge the latter into the former.

Even that solves only a part of the problem.  For some options you 
effectively have to edit the device tree:

-m <mem>
   You have edit memory@0 node.  You even might have to add a node
   depending on the amount of memory (i.e. one for the memory below
   4G one for the memory above ...).

-cpu <cpu>
   You have to edit the cpu node.

-smp <n>
   You have to insert cpu nodes.

cheers,
   Gerd