Re: [PATCH v7 0/4] libfdt: Add support for device tree overlays

[Phil Elwell <philip.j.elwell-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On 06/10/2016 10:47, David Gibson wrote:
> On Fri, Sep 30, 2016 at 03:57:13PM +0200, Maxime Ripard wrote:
>> Hi,
>>
>> The device tree overlays are a great solution to the issue raised by
>> the bunch expandable boards we find everywhere these days, like the
>> Beaglebone, Raspberry Pi or CHIP.
>>
>> Although for now Linux is the only available tool that can deal with
>> overlays, some other components like bootloaders or user-space tools
>> might need to apply these overlays on top of a base device tree.
>>
>> To address these use cases, we introduce a new function to the libfdt,
>> fdt_overlay_apply, that does just that.
>>
>> You can find a test program here: http://code.bulix.org/792zum-99476?raw
>>
>> This is the last patches sent to U-boot, with the modifications
>> suggested by David, and the additional test cases.
>>
>> Let me know what you think!
>> Maxime
> Looking pretty good.  There's a minor error in 3/4 which I've pointed
> out, it can be fixed in a followup.
>
> An error in the conditionals means it's trying to run some of the
> tests which require an overlay-aware dtc on even when that's not
> available - I adjusted 4/4 to correct that.
>
> It also hit build failures on Travis, because the compiler version
> there complains about local variables named 'index' shadowing the
> standard library function.  I've corrected that with a followup patch.
>
> With that done, the whole lot has been committed to master.
>
Now that upstream libfdt can resolve and apply overlays we need a way
of generating them. I have a set of three patches from Pantelis that
add "plugin" support to dtc, together with two downstream (Raspberry Pi)
patches that fix an uninitialised memory reference and restrict
__local_fixups__  generation to overlays.

Is there already a plan to get the enhanced dtc upstreamed? If so, can I
get the downstream fixes included?

Phil Elwell

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