linux-kernel - Re: [GIT PULL] omap changes for v2.6.39 merge window

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Message-ID: <20110331122308.GG7420@game.jcrosoft.org>
Date:	Thu, 31 Mar 2011 14:23:08 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, david@...g.hm,
	Arnd Bergmann <arnd@...db.de>,
	Nicolas Pitre <nico@...xnic.net>,
	Tony Lindgren <tony@...mide.com>,
	Dave Airlie <airlied@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	David Brown <davidb@...eaurora.org>,
	linux-omap@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [GIT PULL] omap changes for v2.6.39 merge window

On 11:50 Thu 31 Mar     , Russell King - ARM Linux wrote:
> On Thu, Mar 31, 2011 at 10:54:40AM +0100, Alan Cox wrote:
> > If I boot it on a current PC I'm booting on a multiprocessor system with
> > different timers, totally different IRQ controllers, different keyboard
> > controllers (USB), PCI Express, an IOMMU, NCQ SATA, ACPI, graphics
> > running in shared host memory able to give/take pages from the host,
> > extra instructions, etc etc
> > 
> > And the same kernel boots just fine on both just fine.
> 
> We've been there for a long time with ARM.  Right from the start I had
> a single kernel image which booted over a range of ARM CPUs and
> platforms.
> 
> As far as ARM CPU architectures go, today we can have a single kernel
> image which covers ARMv3 to ARMv5, and a separate kernel image which
> covers ARMv6 to ARMv7 including SMP and UP variants.  The thing which
> currently stops ARMv3 to ARMv7 all together is the different page table
> layouts, the ASID tagging, the exclusive load/store support for cmpxchg
> and other atomic operations, etc.
As we can see a lots of people work on this, to now do not add thousand of
boards but try to have only a few

Personnaly I do it on at91 as example and will continue to try to have one board in
the kernel with board information pass via Barebox, when it's possible.
I think it's a common effort doen by the ARM Community and this will imply
a lots of changesets.

The work done by Linaro with the device tree will help a lot to simplify the
pass of the information from the boot loader to the kernel. But we can already
do it today.

Best Regards,
J.
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