[SLOF] [PATCH slof v5 3/6] fdt: Pass the resulting device tree to QEMU

[Nikunj A Dadhania]

Segher Boessenkool <segher at kernel.crashing.org> writes:

> On Wed, Oct 18, 2017 at 04:15:05PM +0530, Nikunj A Dadhania wrote:
>> Segher Boessenkool <segher at kernel.crashing.org> writes:
>> > On Wed, Oct 18, 2017 at 08:34:57PM +1100, Alexey Kardashevskiy wrote:
>> >> > Or even not define words for the phandle and ihandle if you don't use
>> >> > them.  Your choice :-)
>> >> 
>> >> I need either:
>> >> - a variable for the unit address or
>> >> - a word to get it ("chosen-cpu-unit").
>> >> 
>> >> They both are better be defined nearby set-chosen-cpu. But fdt.fs is parsed
>> >> before that.
>> >
>> > Well, set-chosen-cpu shouldn't really decide what the boot cpu is
>> > anyway -- it should just set the link in /chosen!
>> >
>> > The current method of just picking whatever is the first device in /cpus
>> > isn't so great anyway.
>> 
>> Earlier, there was an assumption of /cpus/@0, with addition of cpu
>> hotplug in QEMU, I had added code to remove this dependency. That was
>> the reason to find the first device in /cpus
>
> Right, but is there any guarantee that will actually be the boot cpu;
> maybe on qemu it is, but certainly not elsewhere!  (In practice it will
> usually work of course).

Right

Regards
Nikunj