[PATCH v2 0/9] ARM: multi-platform kconfig cleanup and mach-virt removal
arnd at arndb.de
Wed Feb 12 13:20:49 EST 2014
On Wednesday 12 February 2014 18:15:27 Will Deacon wrote:
> On Wed, Feb 12, 2014 at 06:07:56PM +0000, Arnd Bergmann wrote:
> > On Wednesday 12 February 2014 17:16:21 Will Deacon wrote:
> > > On Wed, Feb 12, 2014 at 05:11:45PM +0000, Marc Zyngier wrote:
> > > > On 12/02/14 16:53, Arnd Bergmann wrote:
> > > > >
> > > > > On the topic of V6, we don't support CPU_V6T2 at all, though I assume that
> > > > > there is an ARM1156 core tile for integrator and realview, and we support
> > > > > running the V6/V6K parts with MMU turned off. Would all revisions of ARM1156
> > > > > work with CPU_V6K and !MMU?
> > > >
> > > > CPU_V6 and !MMU should work. V6K might, but that requires close
> > > > inspection (WFE, SEV shouldn't be used in UP context)...
> > >
> > > Well I can boot Debian on my 1136 r0p1 (no v6k) using a v6/v7 kernel, so the
> > > lack of MMU shouldn't change that.
> > I was more worried about ARM1156 not being a strict superset of V6K, i.e.
> > stuff other than the MMU missing from it that the kernel would rely on.
> ARM1156 doesn't implement v6k, so you mean subset, right? My point was that
> 1136 works fine, so the only remaining part should be the lack of MMU.
I meant superset of the no-mmu subset of v6k. ARM1156 introduced Thumb2
support, so it's clearly not just a subset but also contains stuff that
wasn't part of v6k.
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