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

[Segher Boessenkool]

On Mon, Oct 16, 2017 at 06:07:06PM +1100, Alexey Kardashevskiy wrote:
> On 16/10/17 17:46, David Gibson wrote:

> >>>> +		/* Fixup the boot cpuid */
> >>>> +		hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);
> >>>
> >>> If SLOF is generating a tree it really should get this header field
> >>> right as well.
> >>
> >>
> >> Ah, I did not realize it is just a phandle from /chosen/cpu. Will
> >> fix.
> > 
> > It's not a phandle.  It's just the "address" (i.e. reg value) of the
> > boot cpu.
> 
> Well, it is "reg" of a CPU with phandle==/chosen/cpu so my fdt code needs
> to look there to pick the right "reg" rather than just plain 0. I'll fix
> this but in general can it possibly be not a zero in QEMU/SLOF?

/chosen/cpu is an ihandle, not a phandle.  Most (if not all) references
in /chosen are.


Segher