Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays

[Pantelis Antoniou]

Hi Sebastian,

On Nov 7, 2013, at 9:25 PM, Sebastian Andrzej Siewior wrote:

> On 06.11.13, Guenter Roeck wrote:
> |…
> thanks for the explanation.
> 
>> We use DT overlays to describe the hardware on those boards and, if necessary,
>> its configuration. For example, if there is a PCIe switch, the overlay would
>> describe its memory and bus number configuration.
> 
> So have your "fix" configuration and a few overlays you switch at
> runtime. The problem you have is that you want to switch a specific part
> if your configuration at runtime. I assume you run DT on ARM. What
> happens if you swtich from ARM to x86 and you "keep" your FPGA
> configuration requirement? You can't use both, DT and ACPI, right? So
> what happens then?
> 

FWIW DT has been ported to x86. And is present on arm/powerpc/mips/arc and possibly
others.

So what are we talking about again? If you care about the non-DT case, why
don't you make a patch about how you could support Guenter's use case on
the x86.

His use case is not uncommon, believe it or not, and x86 would benefit from
something this flexible.

>> 
>> Guenter
> 
> Sebastian

Regards

-- Pantelis--
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