From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Mon, 26 Jan 2015 20:52:19 +0100
From: Arnaud Degroote <arnaud.degroote@isae.fr>
Message-ID: <20150126195219.GA10959@bugfree>
References: <20150126190241.GA10160@bugfree>
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Subject: Re: [Xenomai] Porting Xenomai on Odroid-U3
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org

On 26/Jan - 20:09, Gilles Chanteperdrix wrote:
> On Mon, Jan 26, 2015 at 08:02:41PM +0100, Arnaud Degroote wrote:
> > Hi list,
> > 
> > I'm trying to port Xenomai on Odroid-U3. I read on the list that there
> > is a first try by GP Orcullo, so I start from its work.
> > 
> > I'm working on a 3.17.8 kernel on which I ported the Ipipe / Xenomai
> > patch. I validated it on two omaps platform where I don't see regression
> > against previous version of the patch, so I'm fairly confident that the
> > core part is correct. In a second time, I ported the previous effort of
> > GP Orcullo. The current state of the effort is available on 
> > 
> > https://github.com/adegroote/linux/tree/linux-stable-xenomai-odroid-3.17.y
> > 
> > I tested without IPIPE, and with IPIPE. Troubles start with the XENOMAI
> > option. Basically, the kernel seems to hangs when I load any "skin" (I
> > compiled them in modules to be sure). For example, 
> > 
> > modprobe xeno-native
> > 
> > prints
> > 
> > Xenomai: starting native API services.	
> > 
> > but I cannot get back the shell prompt.
> > 
> > From the Troubleshooting part, I suppose something is wrong with the
> > ipipe_timer, but I don't have much idea where to look for. 
> > 
> > Can someone give me some inputs about how to trace / debug this issue
> > or/and quickly check if I miss something obvious in my patch.
> > 
> > https://github.com/adegroote/linux/commit/81c6ebeb3127efdceb3e31f9d3f1f400ecbb579f.patch
> 
> Well, you should put some printks in the timer code to see what is
> the last action done. Is the ->ack function called, does it really
> acknowledge the timer interrupt at timer level (because if it does
> not, the interrupt will trigger again at the end of the current
> interrupt).

Thanks Gilles,
I will try tomorrow morning, when I will be back to work.
> 
> Could you post a link to the patched file handling the timer ?

The timer used is exynos-mct, available here

https://github.com/adegroote/linux/blob/linux-stable-xenomai-odroid-3.17.y/drivers/clocksource/exynos_mct.c

Thanks,

-- 
Arnaud Degroote
ISAE DMIA