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Message-ID: <20120510110242.GE3190@n2100.arm.linux.org.uk>
Date:	Thu, 10 May 2012 12:02:42 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Ben Dooks <ben-linux@...ff.org>
Cc:	Arnd Bergmann <arnd@...db.de>, Kukjin Kim <kgene.kim@...sung.com>,
	linaro-dev@...ts.linaro.org, Jason Cooper <jason@...edaemon.net>,
	Nicolas Pitre <nico@...xnic.net>,
	Tony Lindgren <tony@...mide.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-kernel@...r.kernel.org,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Deepak Saxena <dsaxena@...aro.org>,
	Olof Johansson <olof@...om.net>,
	David Brown <davidb@...eaurora.org>, shawn.guo@...aro.org,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Making ARM multiplatform kernels DT-only?

On Thu, May 10, 2012 at 11:55:15AM +0100, Ben Dooks wrote:
> On Thu, May 03, 2012 at 03:18:53PM +0100, Russell King - ARM Linux wrote:
> > I think what you're proposing is a totally artificial restriction.
> > There's no problem with a kernel supporting DT and non-DT together.
> > We've proven that many many times.  I prove it _every_ night that my
> > build and boot system runs - the OMAP LDP boots a multiplatform kernel
> > just fine without DT.
> 
> We could have had the same for Samsung's entire range if a bit of work
> had been applied to do things like PAGE_OFFSET and replaceable IRQ
> controllers.

We never did dynamic PAGE_OFFSET because we _had_ taken the decision with
the inclusion of XIP support that we weren't going to have self-modifying
code in the kernel - and loading the offset for every page table walk
would have been very expensive.

The self-modifying code viewpoint seems to have changed as a result of
Nicolas moving jobs, from an employer who wanted XIP to one who wants a
single kernel image, which in itself isn't surprising.
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