Re: [Xenomai] patch for RPI2

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On Fri, Dec 18, 2015 at 03:40:31PM +0800, Joe Lee wrote:
> On Wednesday, December 16, 2015 02:42 PM, Gilles Chanteperdrix wrote:
> > On Tue, Dec 15, 2015 at 07:12:26PM -0800, Mathieu Rondonneau wrote:
> >> On 15-12-15 10:43 AM, Gilles Chanteperdrix wrote:
> >>> On Tue, Dec 15, 2015 at 01:22:55PM +0100, ilyasse toumi wrote:
> >>>> Hi there,
> >>>>
> >>>> I'm using kernel rpi-3.18.y as mentioned in an email sent by Joe Lee about
> >>>> RPI2, I used the patch ipipe-core-3.18.20-arm-6.patch and also the patch
> >>>> for RPI2 version5, the problem is that when i try to compile the kernel
> >>>> after patching it it gives some errors.
> >>>> It's about some implicit declarations of functions that are present in the
> >>>> patch like
> >>>>
> >>>> __ipipe_mach_update_tsc
> >>>
> >>> This one is probably due to a misconfiguration, i.e. you enabled
> >>> xenomai, but not a SOC or SOC family which provides an emulated tsc.
> >>> A lot of the coded added by the patch is compiled conditionally, so
> >>> the fact that a definition for a function is present in the patch
> >>> does not necessarily mean that it will be present with your
> >>> particular build configuration.
> >>>
> >> if you do use Xenomai-3.0, it could be that you are missing this part of
> >> the patch?
> >
> > More likely, the SOC is not enabled in the kernel configuration.
> >
> >>>> smp_mb__before_atomic_dec
> >>>> smp_mb__before_atomic_dec
> >>>
> >>> This one indicates a version of Xenomai not ready for Linux 3.18.
> >>> Xenomai 2.6.4 for instance can not be compiled with anything more
> >>> recent than Linux 3.14. You can use Xenomai 2.6 git if you want
> >>> Linux 3.18 support, or if starting a new development, it probably
> >>> makes more sense to jump to Xenomai 3.0 directly.
> >>>
> >>> Regards.
> >>>
> >> That is correct, the patch is only for Xenomai 3.0.
> >
> > No. The patch should also work with Xenomai 2.6, but you need
> > Xenomai 2.6 git.
> >
> Hi Gilles,
> The Xenomai 3.0.1 patched kernel is OK. But the Xenomai 2.6 patched 
> sometimes hang like this:
> [7.407819] Xenomai: stuck on nucleus lock 808b14a0
> [7.407819]    waiter = kernel/xenomai/nucleus/intr.c:114
> (xnintr_clock_handler(), CPU #2)
> [7.407819]    owner  = kernel/xenomai/nucleus/intr.c:114
> (xnintr_clock_handler(), CPU #1)
> Could you help me?

Enable the I-pipe tracer, and trigger a trace freeze/trace dump upon
such failure. But since Xenomai 2.6 is running fine on other
platforms, it points to a problem in the RPi2 patch.

-- 
					    Gilles.
https://click-hack.org