question about ARM11MP cpu architecture identification

[Catalin Marinas]

On Tue, 2010-01-12 at 16:42 +0000, Russell King - ARM Linux wrote:
> On Tue, Jan 12, 2010 at 04:26:12PM +0000, Catalin Marinas wrote:
> > On Tue, 2010-01-12 at 16:21 +0000, saeed bishara wrote:
> > >     The ARM11MP (rev r2p0) cpu architecture is ARMv6, and according to
> > > the http://infocenter.arm.com, its Main ID register is 0x410FB024, and
> > > the MMFR[3:0] is 3. but it looks to me that the cpu_architecture()
> > > will identify it as ARMv7, and if the kernel was configured with
> > > CPU_V7 only, then the lookup_processor_type() function also will
> > > identify it as ARMv7. Am I missing something here?
> >
> > cpu_architecture() returns the architecture version of the supported MMU
> > which on ARM11MPCore is the same as on ARMv7.
> >
> > Even if it is possible to configure both v6 and v7 in the same kernel, I
> > don't think it is currently possible to successfully run such kernel.
> 
> What makes you think that?  I've been building v6+v7 kernels for Realview
> (with a patch to provide the right build options for the ARMv7 arch/arm/mm
> files) and ISTR it works fine on my Realview board.

I don't remember exactly but it didn't work for me some time ago. I
think it failed to build (though I could have worked around this with
something like -march=all).

If you have a clean patch, please push it upstream.

-- 
Catalin