On 28/09/13 20:15, Uwe Kleine-König wrote:
Hi Arnd,
On Fri, Sep 27, 2013 at 11:44:01PM +0200, Arnd Bergmann wrote:
On Thursday 26 September 2013, Uwe Kleine-König wrote:
[...]
* An ARMv7-M kernel cannot run on either ARMv4/v5 nor ARMv6/v7-A, right?
The entry convention is different (ARMv7-M doesn't support the ARM
instruction set but you need to jump into the kernel in ARM mode for
v4-v7). Other that that I don't know if there is a problem. Maybe
Jonathan can say anything here?
There's a more fundamental difference between V7M and other things
before it - V7M uses a different exception model (We don't have the idea
of SVC, USR, IRQ, FIQ etc, instead it is Thread/Process/Handler modes).
So no, V7M is V7M, I'm afraid.
Or alternatively if you want an efm32
devboard, just tell me.
They're cool, I can recommend one ;)
Do you prevent building such a kernel in Kconfig?
I'm sure my Kconfig magic isn't waterproof. It took me a few tries to
expand the multiarch architecture selection to make v7-m selectable at
all.
There's a patch series I posted in the past for !MMU with Vexpress that
was a way to have a !MMU without changing the ARCH_MULTIPLATFORM
configuration:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-May/168106.html
You could take a look at that as an alternative approach, but the other
series you've sent looks reasonable from a !MMU/Multiplatform point of
view, I'm just not sure about the XIP stuff.
Jonny
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