linux-kernel - Re: [RFC PATCH 0/1] riscv: dts: Allow BUILTIN

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Date: Fri, 23 Feb 2024 11:39:10 +0000
From: Conor Dooley <conor@...nel.org>
To: Yangyu Chen <cyy@...self.name>
Cc: linux-riscv@...ts.infradead.org,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, linux-kernel@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Alexandre Ghiti <alex@...ti.fr>, Rob Herring <robh+dt@...nel.org>,
	devicetree@...r.kernel.org
Subject: Re: [RFC PATCH 0/1] riscv: dts: Allow BUILTIN_DTB for all socs

On Fri, Feb 23, 2024 at 03:42:01PM +0800, Yangyu Chen wrote:
> To sum up, I agree with the reasons to refuse it for debugging purposes. I
> am wondering what to do next. After reviewing the code carefully, I found
> this feature not only for K210 but also for other SoCs. But for other SoCs,
> it is broken as it will link multiple dtbs to the kernel, but the kernel
> will always pick up the first dtb to use as discussed on this thread [2].
> That is because SOC_BUILTIN_DTB_DECLARE is removed from this patch [3] then
> no code to select for multiple dtbs now. And makefiles on other soc which is
> on the mainline kernel currently will build every dtb object file from this
> patch [4]. So this feature for other SoCs is broken now.
> 
> Choices might be one of the following:
> 
> 1. Remove BUILTIN_DTB feature if K210 support get removed
> 2. Continue to add this feature to get this work for other socs
> 
> I prefer to continue to get this feature to work. Not only for my debugging
> purposes but also for fixes.

My email might have been a bit unclear because I responded to things out
of order. My final thoughts were that we should apply a v2 (or 3 etc) of
this patch if for no other reason than fixing BUILTIN_DTB. I could not
really justify refusing your changes when a patch fixing BUILTIN_DTB for
the non-k210 platforms that support it would look almost identical to
this patch. Apologies if you misunderstood.

I left some comments on the patch itself with a v2 in mind.

Thanks,
Conor.

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