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[67.187.90.124]) by smtp.gmail.com with ESMTPSA id q4sm5289491qkj.5.2021.01.28.22.03.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 28 Jan 2021 22:03:24 -0800 (PST) Subject: Re: [PATCH V6 2/6] scripts: dtc: Build fdtoverlay tool To: Viresh Kumar , Rob Herring , Pantelis Antoniou , Masahiro Yamada Cc: Vincent Guittot , linux-kernel@vger.kernel.org, anmar.oueja@linaro.org, Bill Mills , David Gibson , devicetree@vger.kernel.org, Michal Marek References: <2dfec4acb1bfbab08b431908ace0a77cc3279434.1611312122.git.viresh.kumar@linaro.org> From: Frank Rowand Message-ID: <1f6408aa-9900-fe4a-d885-028ff8329707@gmail.com> Date: Fri, 29 Jan 2021 00:03:23 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <2dfec4acb1bfbab08b431908ace0a77cc3279434.1611312122.git.viresh.kumar@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/22/21 4:50 AM, Viresh Kumar wrote: > We will start building overlays for platforms soon in the kernel and > would need fdtoverlay going forward. Lets start building it. > > The fdtoverlay program applies (or merges) one or more overlay dtb > blobs to a base dtb blob. The kernel build system would later use > fdtoverlay to generate the overlaid blobs based on platform specific > configurations. > > Signed-off-by: Viresh Kumar > --- > scripts/dtc/Makefile | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > 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 > > -hostprogs-always-$(CONFIG_DTC) += dtc > +hostprogs-always-$(CONFIG_DTC) += dtc fdtoverlay > hostprogs-always-$(CHECK_DT_BINDING) += dtc > > dtc-objs := dtc.o flattree.o fstree.o data.o livetree.o treesource.o \ > srcpos.o checks.o util.o > dtc-objs += dtc-lexer.lex.o dtc-parser.tab.o > Please add this comment: # The upstream project builds libfdt as a separate library. We are choosing to # instead directly link the libfdt object files into fdtoverly > +libfdt-objs := fdt.o fdt_ro.o fdt_wip.o fdt_sw.o fdt_rw.o fdt_strerror.o fdt_empty_tree.o fdt_addresses.o fdt_overlay.o > +libfdt = $(addprefix libfdt/,$(libfdt-objs)) > +fdtoverlay-objs := $(libfdt) fdtoverlay.o util.o > + > # Source files need to get at the userspace version of libfdt_env.h to compile > HOST_EXTRACFLAGS += -I $(srctree)/$(src)/libfdt > >