linux-kernel - Re: [PATCH 03/11] MIPS: support RAM beyond 32-bit

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Message-Id: <52274cef-5334-4e97-a0c2-de7577e3e326@app.fastmail.com>
Date:   Fri, 06 Oct 2023 13:21:08 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Gregory Clement" <gregory.clement@...tlin.com>,
        "Paul Burton" <paulburton@...nel.org>,
        "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org, "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "Vladimir Kondratiev" <vladimir.kondratiev@...el.com>,
        "Tawfik Bayouk" <tawfik.bayouk@...ileye.com>,
        "Alexandre Belloni" <alexandre.belloni@...tlin.com>,
        Théo Lebrun <theo.lebrun@...tlin.com>,
        "Thomas Petazzoni" <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 03/11] MIPS: support RAM beyond 32-bit

On Wed, Oct 4, 2023, at 18:10, Gregory CLEMENT wrote:
> From: Vladimir Kondratiev <vladimir.kondratiev@...el.com>
>
> Support platforms where RAM is mapped beyond 32-bit.
>
> The kernel parameter ddr32_alias allows to setup the alias to point
> outside the first 4 GB of memory.
>
> Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@...el.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>

This needs a better explanation, and probably a rewrite.
Having to pass the memory address on the command line does
not sound like an appropriate way to boot the kernel, so
I think either this needs to be detected from the running kernel
itself, or passed through DT.

      Arnd