From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu, 16 Apr 2015 18:56:00 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Message-ID: <20150416165600.GI1589@hermes.click-hack.org>
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Subject: Re: [Xenomai] [PATCH] Add support for SUNXI boards
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: GP Orcullo <kinsamanka@gmail.com>, "xenomai@xenomai.org" <xenomai@xenomai.org>

On Thu, Apr 16, 2015 at 06:53:24PM +0200, Jan Kiszka wrote:
> On 2015-04-16 18:43, Gilles Chanteperdrix wrote:
> > On Thu, Apr 16, 2015 at 06:37:35PM +0200, Jan Kiszka wrote:
> >> On 2015-04-16 18:16, Gilles Chanteperdrix wrote:
> >>> On Fri, Apr 17, 2015 at 12:04:22AM +0800, GP Orcullo wrote:
> >>>> On Thu, Apr 16, 2015 at 9:19 PM, Gilles Chanteperdrix
> >>>> <gilles.chanteperdrix@xenomai.org> wrote:
> >>>>> On Thu, Apr 16, 2015 at 04:05:05PM +0800, GP Orcullo wrote:
> >>>>>> Tested on a Cubieboard2 with v3.16.7-ckt9 kernel.
> >>>>>
> >>>>> Does not sunxi have GPIO ?
> >>>>>
> >>>>> --
> >>>>>                                             Gilles.
> >>>>
> >>>> There's no GPIO driver in the mainline kernel. The original sunxi
> >>>> kernel has incomplete support for GPIOs.
> >>>
> >>> Ok, what about timer and tsc? Basically, you should run through the
> >>> ARM porting guide and check every modification to be made. And if
> >>> you have done so, the commit message should mention it.
> >>
> >> sunxi is pretty generic ARMv7-class in that regard, but double-checking
> >> is surely better.
> > 
> > armv7 does not mean a particular timer. Cortex A9 or cortex A15 do,
> > but different ones, and Cortex A8 does not for instance. The
> > processor we are talking about is probably not a cortex A9 since on
> > I-pipe, there is no timer or tsc defined on A9 when booting in UP
> > mode (and GP Orcullo is booting in UP mode). So my question is not
> > about "double-checking", it is rather the first check.
> 
> The A20 is a dual-core Cortex A7.

Strange that GP Orcullo is not running the kernel in SMP mode then.
The question still stands, what does this processor/core use as timer/tsc?

-- 
					    Gilles.