linux-kernel - Re: [PATCH] ARM: allow, but warn, when issuing ioremap() on RAM

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Message-ID: <20101011090212.GA27153@n2100.arm.linux.org.uk>
Date:	Mon, 11 Oct 2010 10:02:12 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Felipe Contreras <felipe.contreras@...il.com>,
	Greg KH <greg@...ah.com>,
	linux-main <linux-kernel@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	Arnd Hannemann <arnd@...dnet.de>,
	Han Jonghun <jonghun79.han@...il.com>,
	Hemant Pedanekar <hemantp@...com>
Subject: Re: [PATCH] ARM: allow, but warn, when issuing ioremap() on RAM

On Mon, Oct 11, 2010 at 10:35:08AM +0200, Uwe Kleine-König wrote:
> Alternatively when calling fixup only after parse_tags in setup_arch()
> it worked.  But I guess this change is not for discussion.
> OTOH I wonder why fixup gets passed meminfo.  It's not very useful if
> it's not yet filled.

Because, rather than pass in ATAGs or set the memory on the command line,
they instead wanted to hard-code it in C - something which still happens
today:

arch/arm/mach-msm/board-halibut.c
arch/arm/mach-msm/board-mahimahi.c
arch/arm/mach-msm/board-sapphire.c
arch/arm/mach-msm/board-trout.c
arch/arm/mach-pxa/eseries.c
arch/arm/mach-pxa/spitz.c
arch/arm/mach-s3c2412/mach-smdk2413.c
arch/arm/mach-s3c2412/mach-vstms.c
arch/arm/mach-tegra/board-harmony.c

This is part of the on-going pain of poor quality boot loaders.
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