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[73.88.245.53]) by smtp.gmail.com with ESMTPSA id f138sm16113793ywb.99.2020.01.20.08.16.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 20 Jan 2020 08:16:06 -0800 (PST) Subject: Re: [RFC PATCH 3/3] scripts: Use -B dtc option to generate dtb build information. To: Alexandre Torgue , robh+dt@kernel.org, Masahiro Yamada , Michal Marek , david@gibson.dropbear.id.au, sjg@chromium.org Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, devicetree-compiler@vger.kernel.org References: <20200113181625.3130-1-alexandre.torgue@st.com> <20200113181625.3130-4-alexandre.torgue@st.com> From: Frank Rowand Message-ID: <5b5a40b5-6954-05aa-5c7f-5ae8100aa1ee@gmail.com> Date: Mon, 20 Jan 2020 10:16:05 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200113181625.3130-4-alexandre.torgue@st.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 1/13/20 12:16 PM, Alexandre Torgue wrote: > This commit adds a new script to create a string in tmp file with > some information (date, linux version, user). This file is then used by > dtc with -B option to append dts file with a new property. > During kernel boot it will then be possible to printout DTB build > information (date, linux version used, user). > > Signed-off-by: Alexandre Torgue > > diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib > index 3fa32f83b2d7..6a98eac1e56d 100644 > --- a/scripts/Makefile.lib > +++ b/scripts/Makefile.lib > @@ -235,6 +235,7 @@ quiet_cmd_gzip = GZIP $@ > # DTC > # --------------------------------------------------------------------------- > DTC ?= $(objtree)/scripts/dtc/dtc > +DTB_GEN_INFO ?= $(objtree)/scripts/gen_dtb_build_info > > # Disable noisy checks by default > ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),) > @@ -275,11 +276,13 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE > > quiet_cmd_dtc = DTC $@ > cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ > - $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ > - $(DTC) -O $(2) -o $@ -b 0 \ > + $(DTB_GEN_INFO) $(@).info ;\ > + $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ > + $(DTC) -O $(2) -o $@ -b 0 -B $(@).info\ > $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ > - -d $(depfile).dtc.tmp $(dtc-tmp) ; \ > - cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) > + -d $(depfile).dtc.tmp $(dtc-tmp) ; \ > + rm $(@).info ; \ > + cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) The indentation should be tabs instead of spaces. -Frank > > $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE > $(call if_changed_dep,dtc,dtb) > diff --git a/scripts/gen_dtb_build_info b/scripts/gen_dtb_build_info > new file mode 100755 > index 000000000000..30cf7506b9d5 > --- /dev/null > +++ b/scripts/gen_dtb_build_info > @@ -0,0 +1,11 @@ > +#!/bin/sh > +# SPDX-License-Identifier: GPL-2.0 > + > +DTB_TARGET=$@ > +COMPILE_BY=$(whoami | sed 's/\\/\\\\/') > + > +touch $DTB_TARGET > + > +{ > + echo From Linux $KERNELRELEASE by $COMPILE_BY the $(date). > +} > $DTB_TARGET >