linux-kernel - Re: [PATCH -fixes] riscv: Fix BUILTIN_DTB for sifive and microchip soc

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Date:   Sat, 5 Jun 2021 08:33:12 +0200
From:   Alex Ghiti <alex@...ti.fr>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        DTML <devicetree@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -fixes] riscv: Fix BUILTIN_DTB for sifive and microchip
 soc

Hi Arnd,

Le 4/06/2021 à 15:08, Arnd Bergmann a écrit :
> On Fri, Jun 4, 2021 at 2:06 PM Alexandre Ghiti <alex@...ti.fr> wrote:
>>
>> Fix BUILTIN_DTB config which resulted in a dtb that was actually not built
>> into the Linux image: in the same manner as Canaan soc does, create an object
>> file from the dtb file that will get linked into the Linux image.
>>
>> Signed-off-by: Alexandre Ghiti <alex@...ti.fr>
> 
> Along the same lines as the comment that Jisheng Zhang made on the fixed
> address, building a dtb into the kernel itself fundamentally breaks generic
> kernel images.
> 
> I can understand using it on K210, which is extremely limited and wouldn't
> run a generic kernel anyway, but for normal platforms like microchip and
> sifive, it would be better to disallow CONFIG_BUILTIN_DTB in Kconfig
> and require a non-broken boot loader.

I kind of disagree because if I want to build a custom kernel for those 
platforms with a builtin dtb for some reasons (debug, development..Etc), 
I think I should be able to do so.

> 
>        Arnd
> 
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> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv
> 

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