linux-kernel - Re: [PATCH 1/6] arm64: Unconditionally call unflatten_device

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Date: Tue, 16 Jan 2024 17:27:18 -0800
From: Stephen Boyd <sboyd@...nel.org>
To: Mark Rutland <mark.rutland@....com>
Cc: Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org, patches@...ts.linux.dev, linux-um@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org, devicetree@...r.kernel.org, Frank Rowand <frowand.list@...il.com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH 1/6] arm64: Unconditionally call unflatten_device_tree()

Quoting Mark Rutland (2024-01-16 03:51:14)
> Hi Stephen,
> 
> On Fri, Jan 12, 2024 at 12:07:44PM -0800, Stephen Boyd wrote:
> > Call this function unconditionally so that we can populate an empty DTB
> > on platforms that don't boot with a firmware provided or builtin DTB.
> > There's no harm in calling unflatten_device_tree() unconditionally.
> 
> For better or worse, that's not true: there are systems the provide both a DTB
> *and* ACPI tables, and we must not consume both at the same time as those can
> clash and cause all sorts of problems. In addition, we don't want people being
> "clever" and describing disparate portions of their system in ACPI and DT.
> 
> It is a very deliberate choice to not unflatten the DTB when ACPI is in use,
> and I don't think we want to reopen this can of worms.

Hmm ok. I missed this part. Can we knock out the initial_boot_params in
this case so that we don't unflatten a DTB when ACPI is in use?