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Subject: Re: [PATCH] cmd_dtc: Enable generation of device tree symbols
To:     Cyril Brulebois <cyril@debamax.com>,
        =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= <uwe@kleine-koenig.org>,
        Frank Rowand <frowand.list@gmail.com>
Cc:     Michal Marek <michal.lkml@markovi.net>,
        Arnd Bergmann <arnd@arndb.de>, linux-kbuild@vger.kernel.org,
        Masahiro Yamada <masahiroy@kernel.org>,
        linux-kernel@vger.kernel.org, Maxime Ripard <mripard@kernel.org>,
        linux-arm-kernel@lists.infradead.org
References: <20210125105757.661240-1-uwe@kleine-koenig.org>
 <20210125111520.mgqe7u7fh5425ywl@debamax.com>
From:   Frank Rowand <frowand.list@gmail.com>
Message-ID: <e7e0751f-991f-baa5-0c76-598542d5fdd5@gmail.com>
Date:   Tue, 26 Jan 2021 12:01:55 -0600
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+frank

On 1/25/21 5:15 AM, Cyril Brulebois wrote:
> Hi,
> 
> Uwe Kleine-König <uwe@kleine-koenig.org> (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 <uwe@kleine-koenig.org>
> 
> Tested-by: Cyril Brulebois <cyril@debamax.com>
> 
> 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,
> 
> 
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