[haiku-development] Re: RFC: API changes to device manager / FDT support

  • From: François Revol <revol@xxxxxxx>
  • To: haiku-development@xxxxxxxxxxxxx
  • Date: Tue, 13 Nov 2012 10:02:30 +0100

On 13/11/2012 09:49, Ithamar R. Adema wrote:
> Hi all,
> After seeing Haiku/ARM scan my boot disk (yay!) I'm now looking at
> Flattened Device Tree[1] support. This code should be generic, usable on
> any platform, and I would like to make it a "bus" in the device manager,
> like for example ACPI.
> FDT is simply a tree structure describing the different hardware
> components, so conceptually it matches up real well with the
> device_manager structure. However, the data contained has a little more
> complexity then the current device_manager allows. The one thing I miss
> in the device_manager API is the ability for lists, e.g. multiple IRQs,
> multiple GPIOs, basically array support.

For the record, currently Linux on OpenFirmware calls it to make a dump
of the OF device tree into an FDT as well, to avoid relying on OF later
on and having to keep the mappings around.


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