linux-kernel - Re: [PATCH v4 07/11] ARM: allow MULTIPLATFORM with !MMU

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Message-ID: <f2b85e294afb55fdca85a16e6ad6c13c@agner.ch>
Date:	Mon, 06 Apr 2015 11:33:53 +0200
From:	Stefan Agner <stefan@...er.ch>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	shawn.guo@...aro.org, kernel@...gutronix.de,
	u.kleine-koenig@...gutronix.de, jason@...edaemon.net,
	olof@...om.net, arnd@...db.de, daniel.lezcano@...aro.org,
	tglx@...utronix.de, mark.rutland@....com, pawel.moll@....com,
	robh+dt@...nel.org, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, marc.zyngier@....com,
	mcoquelin.stm32@...il.com, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 07/11] ARM: allow MULTIPLATFORM with !MMU

On 2015-04-06 10:54, Russell King - ARM Linux wrote:
> On Mon, Apr 06, 2015 at 10:38:10AM +0200, Stefan Agner wrote:
>> We already prevent a kernel image which mixes V4/V4T/V5 and V6/V7. And
>> so we would do with V7M too. Just because it's in multiplatform doesn't
>> mean we need to mix things up.
> 
> I don't think you're getting what I'm saying at all... :(

It's not that I don't get it. I'm just arguing against it.

IMHO, it's wrong to create a parallel universe for v7M multiplatform...

Multiplatform as I understand it is mainly about selecting multiple SoC
_platforms_ but not necessarily multiple CPU platforms. It happens to
work well for V6/V7, but does not for others, and preventing
multiselection for incompatible CPU platforms is the way to prevent
creating such images.

> Please read the first bit of my replies again, where I say that we do
> _not_ want to remove the !MMU dependency from multiplatform.  This is
> something I feel _very_ strongly about, and something which I've written
> about many times on this list.

Ok, I don't have such a strong feel for multiplatform, it just feels a
bit better to me. I need a top level ARCH which is able to live with
!MMU. Will try the ARCH_SINGLE_ARMV7M approach then.

--
Stefan
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