From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Agner Subject: Re: [PATCH v4 07/11] ARM: allow MULTIPLATFORM with !MMU Date: Mon, 06 Apr 2015 11:33:53 +0200 Message-ID: References: <1428090292-21693-1-git-send-email-stefan@agner.ch> <1428090292-21693-8-git-send-email-stefan@agner.ch> <20150403200931.GD13898@n2100.arm.linux.org.uk> <1f84d767d3bb8a8c470a26064cba454e@agner.ch> <20150405161014.GG13898@n2100.arm.linux.org.uk> <24394c50bcd8000c21aca0360fd20b6f@agner.ch> <20150405224455.GB12732@n2100.arm.linux.org.uk> <58bb3fd4f9e9b3acc7f8b83bd6664177@agner.ch> <20150406081523.GC12732@n2100.arm.linux.org.uk> <8737db3eea65563054df98c932870590@agner.ch> <20150406085443.GD12732@n2100.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150406085443.GD12732@n2100.arm.linux.org.uk> Sender: linux-kernel-owner@vger.kernel.org To: Russell King - ARM Linux Cc: shawn.guo@linaro.org, kernel@pengutronix.de, u.kleine-koenig@pengutronix.de, jason@lakedaemon.net, olof@lixom.net, arnd@arndb.de, daniel.lezcano@linaro.org, tglx@linutronix.de, mark.rutland@arm.com, pawel.moll@arm.com, robh+dt@kernel.org, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, marc.zyngier@arm.com, mcoquelin.stm32@gmail.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org 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