[PATCH kernel] prom_init: Fetch flatten device tree from the system firmware

[Benjamin Herrenschmidt]

On Mon, 2019-06-03 at 18:42 -0500, Segher Boessenkool wrote:
> Hi!
> 
> On Mon, Jun 03, 2019 at 12:56:26PM +1000, Alexey Kardashevskiy wrote:
> > On 03/06/2019 09:23, Segher Boessenkool wrote:
> > > > So I go for the simple one and agree with Alexey's idea.
> > > 
> > > When dealing with a whole device tree you have to know about the
> > > various
> > > dynamically generated nodes and props, and handle each
> > > appropriately.
> > 
> > The code I am changing fetches the device tree and build an fdt.
> > What is
> > that special knowledge in this context you are talking about?
> 
> Things like /options are dynamically generated.

They are generated before we do the call to extract the fdt, what's the
problem there ?

> I thought you would just be able to reuse some FDT parsing code to
> implement my suggested new interface.  Maybe that was too optimistic.

No, the idea is to have SLOF re-flatten it's live tree and hand us a
blob. At least that's my understanding.

Ben.