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[67.187.90.124]) by smtp.gmail.com with ESMTPSA id o15sm4696989qtp.51.2021.01.26.10.01.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 26 Jan 2021 10:01:57 -0800 (PST) Subject: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols To: Cyril Brulebois , =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= , Frank Rowand Cc: Michal Marek , Arnd Bergmann , linux-kbuild@vger.kernel.org, Masahiro Yamada , linux-kernel@vger.kernel.org, Maxime Ripard , linux-arm-kernel@lists.infradead.org References: <20210125105757.661240-1-uwe@kleine-koenig.org> <20210125111520.mgqe7u7fh5425ywl@debamax.com> From: Frank Rowand Message-ID: Date: Tue, 26 Jan 2021 12:01:55 -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: <20210125111520.mgqe7u7fh5425ywl@debamax.com> Content-Type: text/plain; charset=UTF-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org +frank On 1/25/21 5:15 AM, Cyril Brulebois wrote: > Hi, > > Uwe Kleine-König (2021-01-25): >> Adding the -@ switch to dtc results in the binary devicetrees containing >> a list of symbolic references and their paths. This is necessary to >> apply device tree overlays e.g. on Raspberry Pi as described on >> https://www.raspberrypi.org/documentation/configuration/device-tree.md. >> >> Obviously the downside of this change is an increas of the size of the > > (as spotted by Uwe right after sending →) increase > >> generated dtbs, for an arm out-of-tree build (multi_v7_defconfig): >> >> $ du -s arch/arm/boot/dts* >> 101380 arch/arm/boot/dts-pre >> 114308 arch/arm/boot/dts-post >> >> so this is in average an increase of 12.8% in size. >> >> Signed-off-by: Uwe Kleine-König > > Tested-by: Cyril Brulebois > > with: > - a Raspberry Pi CM3 > - a carrier board designed after the official IO Board V3 > - an RTC accessible over I²C, made functional via a DTB overlay, that > can only be enabled once bcm2710-rpi-cm3.dtb has been generated with > this patch applied. > > > Cheers, > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >