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Date: Wed, 12 Nov 2014 15:27:11 +0100
From: Thierry Bultel <tbultel@free.fr>
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Subject: Re: [Xenomai] IMX kernel 3.0.35_4.1.0 +
 adeos-ipipe-3.0.43-mx6q-1.18-14 -> very slow boot
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: nicolas Mabire <nicolas.mabire@basystemes.fr>, xenomai@xenomai.org

Le 12/11/2014 14:34, Gilles Chanteperdrix a écrit :
> On Wed, Nov 12, 2014 at 02:17:11PM +0100, Thierry Bultel wrote:
>> Le 11/11/2014 21:03, Gilles Chanteperdrix a écrit :
>>> On Tue, Nov 11, 2014 at 08:57:34PM +0100, Thierry Bultel wrote:
>>>> Le 10/11/2014 13:36, Gilles Chanteperdrix a écrit :
>>>>> You can use printascii in the timer interrupt acknowledge routine to
>>>>> print a character every HZ ticks, this will give bad latency, but
>>>>> should work.
>>>>>
>>>>
>>>> For unknown reason, the kernel gets stuck after
>>>> "console [tty0] enabled, bootconsole disabled" if I use printascii
>>>> in do_local_timer().
>>>> earlyprintk seems broken as well.
>>>
>>> Without doing this, does earlyprintk work?
>>
>> No it does not. In fact, this kernel is strange with early debug.
>> Namely, even without earlyprintk, when it comes to disable the
>> bootconsole to use the normal one, it uses then re-prints everything
>> was printed before, making think that it has restarted from the
>> beginning.
>>
>> I confirm that calling printascii in do_local_timer() leads to a
>> kernel panic. Same thing if I use __ipipe_serial_debug instead.
>> I have used a counter (one per cpu) to start logging after 30000
>> ticks and it crashes after that delay.
>
> Having looked at the sources, I do not find a debug-macro.S for
> imx6. So, I doubt printascii can work at all. Maybe a first step is
> to implement this missing support.

I think that the implementation is in arch/arm/plat-mxc/include
/mach/debug-macro.S
>
>>> Also, are you running with all I-pipe and Xenomai debugs?
>>
>> That is how I am running now. For now, I am unable to reproduce the
>> freeze. Still testing.
>
> Bad news...
>