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Date:   Sat, 23 Jan 2021 11:35:18 +1100
From:   David Gibson <david@gibson.dropbear.id.au>
To:     Viresh Kumar <viresh.kumar@linaro.org>
Cc:     Frank Rowand <frowand.list@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        linux-kernel@vger.kernel.org, anmar.oueja@linaro.org,
        Bill Mills <bill.mills@linaro.org>, devicetree@vger.kernel.org,
        Michal Marek <michal.lkml@markovi.net>
Subject: Re: [PATCH V6 2/6] scripts: dtc: Build fdtoverlay tool
Message-ID: <20210123003518.GG4400@yekko.fritz.box>
References: <cover.1611312122.git.viresh.kumar@linaro.org>
 <2dfec4acb1bfbab08b431908ace0a77cc3279434.1611312122.git.viresh.kumar@linaro.org>
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On Fri, Jan 22, 2021 at 04:20:32PM +0530, Viresh Kumar wrote:
> We will start building overlays for platforms soon in the kernel and
> would need fdtoverlay going forward. Lets start building it.
>=20
> The fdtoverlay program applies (or merges) one or more overlay dtb

Saying "merges" here is probably misleading, since as I mentioned
elsewhere fdtoverlay can *not* merge overlays, only apply them to a
base tree.

> blobs to a base dtb blob. The kernel build system would later use
> fdtoverlay to generate the overlaid blobs based on platform specific
> configurations.
>=20
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
>  scripts/dtc/Makefile | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>=20
> diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
> index 4852bf44e913..5f19386a49eb 100644
> --- a/scripts/dtc/Makefile
> +++ b/scripts/dtc/Makefile
> @@ -1,13 +1,17 @@
>  # SPDX-License-Identifier: GPL-2.0
>  # scripts/dtc makefile
> =20
> -hostprogs-always-$(CONFIG_DTC)		+=3D dtc
> +hostprogs-always-$(CONFIG_DTC)		+=3D dtc fdtoverlay
>  hostprogs-always-$(CHECK_DT_BINDING)	+=3D dtc
> =20
>  dtc-objs	:=3D dtc.o flattree.o fstree.o data.o livetree.o treesource.o \
>  		   srcpos.o checks.o util.o
>  dtc-objs	+=3D dtc-lexer.lex.o dtc-parser.tab.o
> =20
> +libfdt-objs	:=3D fdt.o fdt_ro.o fdt_wip.o fdt_sw.o fdt_rw.o fdt_strerror=
=2Eo fdt_empty_tree.o fdt_addresses.o fdt_overlay.o
> +libfdt		=3D $(addprefix libfdt/,$(libfdt-objs))
> +fdtoverlay-objs	:=3D $(libfdt) fdtoverlay.o util.o
> +
>  # Source files need to get at the userspace version of libfdt_env.h to c=
ompile
>  HOST_EXTRACFLAGS +=3D -I $(srctree)/$(src)/libfdt
> =20

--=20
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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