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

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Message-Id: <C42A3926-6B43-4BC6-9CAB-572FD8B32475@dominion.thruhere.net>
Date:	Thu, 31 Mar 2011 20:08:54 +0200
From:	Koen Kooi <koen@...inion.thruhere.net>
To:	david@...g.hm
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Nicolas Pitre <nico@...xnic.net>,
	Dave Airlie <airlied@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Tony Lindgren <tony@...mide.com>,
	David Brown <davidb@...eaurora.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [GIT PULL] omap changes for v2.6.39 merge window


Op 31 mrt 2011, om 19:22 heeft david@...g.hm het volgende geschreven:

> On Thu, 31 Mar 2011, 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.
> 
> I don't think the push is to get a single kernel image that boots absolutly everywhere. having separate ARM5 and ARM7 kernels doesn't seem to be a big deal to anyone.

You mean ARMv5 and ARMv7, right? ARM5 and ARM7 are completely different things.

The short, but inaccurate version:

ARM9 -> ARMv4t, ARMv5te*
ARM11 -> ARMv6*
CORTEX-A* -> ARMv7a

regards,

Koen--
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