From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 10 Apr 2012 14:12:05 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-core] preemptive doesn't work
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To: Roberto Bielli <roberto.bielli@domain.hid>
Cc: xenomai@xenomai.org

On 04/10/2012 02:11 PM, Roberto Bielli wrote:
> Il 10/04/2012 14:06, Gilles Chanteperdrix ha scritto:
>> On 04/10/2012 02:05 PM, Roberto Bielli wrote:
>>> Hi Gilles,
>>>
>>> i added this in configure of xenomai so i pass --enable-arm-mach=imx25
>>>
>>> imx25)        arch=5
>>>               tsc_type=__XN_TSC_TYPE_FREERUNNING;;
>>>
>>> Furthermore in plat-mxc/include/mach/mxc.h explain which are cpumx2 and
>>> imx25 is NOT mx2
>>> #define cpu_is_mx2()    (cpu_is_mx21() || cpu_is_mx27())
>>>
>>> i don't understand a things.
>>> Does the tsc necessary to calculate correct timer period, or can i
>>> disable tsc and xenomai continue work correctly ?
>> Xenomai needs the tsc in kernel-space. Obviously, if you do not use the
>> tsc in user-space, you will not see that it is wrong. Correct physical
>> address is only needed for user-space.
>>
>>> However i cannot use tsc in my simple application. I resend the simple C
>>> application that doesn't work.
>> What do you mean you can not use the tsc in your application? What
>> happens if you use it?
>>
> If i use tsc i have no error and i read a correct value.
> 
So, it works. Good news. To know if it works as expected, you can try
the "latency" test.

Something I have not asked, could you type:
cat /proc/xenomai/timer

on the mx25 board?

-- 
                                                                Gilles.