linux-kernel - Re: [PATCH] powerpc/dts: fix not include DTC

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Date:   Wed, 7 Apr 2021 14:58:50 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Youlin Song <syl.loop@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, devicetree@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc/dts: fix not include DTC_FLAGS

On Wed, Apr 7, 2021 at 6:27 AM Michael Ellerman <mpe@...erman.id.au> wrote:
>
> Youlin Song <syl.loop@...il.com> writes:
> > I wanted to build the fsl dts in my machine and found that
> > the dtb have not extra space,so uboot will cause about
> > FDT_ERR_NOSPACE issue.

How do we not have issues with arm and arm64 boards which don't have
padding? Or what took so long to notice on powerpc?

> >
> > Signed-off-by: Youlin Song <syl.loop@...il.com>
> > ---
> >  arch/powerpc/boot/dts/Makefile | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/powerpc/boot/dts/Makefile b/arch/powerpc/boot/dts/Makefile
> > index fb335d05aae8..c21165c0cd76 100644
> > --- a/arch/powerpc/boot/dts/Makefile
> > +++ b/arch/powerpc/boot/dts/Makefile
> > @@ -2,5 +2,6 @@
> >
> >  subdir-y += fsl
> >
> > +DTC_FLAGS   ?= -p 1024
> >  dtstree              := $(srctree)/$(src)
> >  dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
>
> I guess that was missed in 1acf1cf8638a ("powerpc: build .dtb files in dts directory").
>
> Which I think means the assignment to DTC_FLAGS in
> arch/powerpc/boot/Makefile is not needed anymore.
>
> Can you send a v2 removing that assignment and explaining that's what
> happened?

I've wanted to make this common, but I guess that's a separate change.

Rob