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

From: Guenter Roeck
Date: Thu Nov 07 2013 - 17:22:22 EST

On Thu, Nov 07, 2013 at 08:25:58PM +0100, 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?
We intend to use DT on x86 to augment ACPI data. There is a variety of reasons
why we can not use ACPI, nor do we want to as we prefer a single method for
handling OIR on all platforms. FWIW, the non-x86 platform is powerpc, not arm.

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