[U-Boot] [PATCH 0/9] Switch bcm283x platform to use OF_CONTROL

[Stefan Bruens]

On Donnerstag, 6. Oktober 2016 12:32:12 CEST Eric Anholt wrote:
> Alexander Graf <agraf at suse.de> writes:
> >> Am 05.10.2016 um 18:48 schrieb Fabian Vogt <fvogt at suse.com>:
> >> 
> >> Hi,
> >> 
> >> Am Mittwoch, 5. Oktober 2016, 09:54:46 CEST schrieb Stephen Warren:
> >>> On 09/26/2016 06:26 AM, Fabian Vogt wrote:
> >>>> This patch series modifies the used drivers to work with OF_CONTROL
> >>>> and switches the board code and configs to use it.
> >>>> The added device trees are directly from the linux kernel tree
> >>>> and can thus be used for booting the (upstream) kernel.
> >>> 
> >>> Is there a user-visible or developer-visible benefit to this change? In
> >>> general, converting to use DT to instantiate devices simply ends up
> >>> using more code (and hence complexity and time) to get to the exact same
> >>> state afterwards.
> >> 
> >> There are various reasons, like:
> >> 
> >> - The device tree describes the platform, so it can also be used by the
> >> 
> >>  linux kernel for configuration (no separate dtb needed)
> > 
> > With a bit of lobbying, we might even be able to get a working dt from
> > the rpi firmware. That again would enable awesome things like hat
> > support in u-boot :).
> 
> I can't imagine the firmware handing any DT off to the kernel other than
> the one that's being shipped from whatever kernel is being loaded.
> Being able to update the DT in lockstep with the kernel is very much
> part of their process.  (This makes linux insisting that DT is ABI that
> must maintain backwards compat quite painful for upstreaming)
> 
> Given that the firmware already hands the kernel's DT back to the
> kernel, it seems like we should be able to load the kernel's DT too if
> we wanted that.

You mean the DT modified by the firmware according to config.txt, at least 
applying the specified DT overlays?

Kind regards,

Stefan

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