From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: Building for MMU-less vexpress targets
Date: Mon, 5 Nov 2012 19:08:34 +0000 [thread overview]
Message-ID: <201211051908.34291.arnd@arndb.de> (raw)
In-Reply-To: <20121105173640.GR3351@mudshark.cambridge.arm.com>
On Monday 05 November 2012, Will Deacon wrote:
> I was playing around with !CONFIG_MMU today and to my dismay noticed that
> you can't select ARCH_VEXPRESS without CONFIG_MMU=y! This is because
> ARCH_VEXPRESS is only selectable via ARCH_MULTI_V7, which depends on
> ARCH_MULTIPLATFORM which in turn depends on MMU.
>
> I'm inclined to add a dummy VEXPRESS entry to arm/Kconfig which depends on
> !ARCH_MULTIPLATFORM and just selects ARCH_VEXPRESS (with the if ARCH_MULTI_V7
> dependency dropped) but I wondered if you'd got any better ideas?
>
I don't actually remember what the reason for making ARCH_MULTIPLATFORM
depend on MMU was. Maybe it just works if you drop the dependency.
Presumably it's related to ARM_PATCH_PHYS_VIRT and AUTO_ZRELADDR not
working on NOMMU, but if that's the case, we could make it
ARCH_MULTIPLATFORM
bool "Allow multiple platforms to be selected"
select ARM_PATCH_PHYS_VIRT if !MMU
select AUTO_ZRELADDR if !MMU
but maybe those actually work without MMU as well. I have never looked too
closely at NOMMU configurations, every time I tried, they were broken in
combination with something else I wanted to enable.
Arnd
next prev parent reply other threads:[~2012-11-05 19:08 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-05 17:36 Building for MMU-less vexpress targets Will Deacon
2012-11-05 18:03 ` Pawel Moll
2012-11-05 18:13 ` Will Deacon
2012-11-05 19:08 ` Arnd Bergmann [this message]
2012-11-06 12:20 ` Will Deacon
2012-11-06 17:33 ` Arnd Bergmann
2012-11-06 18:34 ` Will Deacon
2012-11-06 20:35 ` Arnd Bergmann
2012-11-06 20:58 ` Nicolas Pitre
2012-11-06 21:14 ` Arnd Bergmann
2012-11-06 22:14 ` Russell King - ARM Linux
2012-11-06 22:59 ` Rob Herring
2012-11-07 12:59 ` Arnd Bergmann
2012-11-07 13:39 ` Russell King - ARM Linux
2012-11-06 23:14 ` Nicolas Pitre
2012-11-07 10:21 ` Will Deacon
2012-11-07 13:29 ` Arnd Bergmann
2013-01-08 19:01 ` Jonathan Austin
2013-01-08 19:11 ` Arnd Bergmann
2013-01-08 19:22 ` Nicolas Pitre
2012-11-06 22:51 ` Jamie Lokier
2012-11-06 23:40 ` Nicolas Pitre
2012-11-06 23:46 ` Jamie Lokier
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