Re: Building out of tree dtbs

[Chris Packham]

On 16/10/24 09:16, Chris Packham wrote:
> (resend without HTML part)
>
> Hi,
>
> I just noticed with the latest 6.12-rc I'm no longer able to build an 
> out of tree dtb by just copying it into arch/$ARCH/boot/dts (at least 
> for ARCH=mips and ARCH=arm64) and running `make my-board.dtb`. I 
> believe buildroot relies on this as well[1].

A simple repro is

make ARCH=arm mvebu_v7_defconfig
cp arch/arm/boot/dts/marvell/armada-385-db-ap.dts 
arch/arm/boot/dts/myboard.dts
make ARCH=arm myboard.dtb

>
> Is this an intentional change? Is it too late to undo it (or provide 
> an alternative way of having out of tree dts that make use of in-tree 
> dtsi).
Looks like this is caused by commit e7e2941300d2 ("kbuild: split device 
tree build rules into scripts/Makefile.dtbs"). The conditional include 
of Makefile.dtbs isn't satisfied when building an out of tree dtb.
>
> Thanks,
> Chris
>
> -- 
>
> [1] - 
> https://gitlab.com/buildroot.org/buildroot/-/blob/master/linux/linux.mk?ref_type=heads#L516
>