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Date: Thu, 09 Jan 2014 10:56:49 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] rtdm_task_init call freezes the system
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To: Nima Nourozi <n.nourozi@gmail.com>
Cc: xenomai@xenomai.org

On 01/09/2014 10:21 AM, Gilles Chanteperdrix wrote:
> On 01/09/2014 03:51 AM, Nima Nourozi wrote:
>> On Mon, Jan 6, 2014 at 2:48 PM, Gilles Chanteperdrix <
>> gilles.chanteperdrix@xenomai.org> wrote:
>>
>>> On 01/06/2014 11:47 PM, Nima Nourozi wrote:
>>>> I'm not seeing the latency command on my board. Is it part of xenomai?
>>> I'm
>>>> using buildroot for my filesystem.
>>>
>>> It may not be installed in /usr/bin
>>>
>>> Try "xeno latency"
>>>
>>>
>>> --
>>>                                                                  Gilles.
>>>
>>
>> Gilles, good news!
>>
>> I was about to report back that the "simplified SPI code" was throwing the
>> same exception before I messed around in the kernel a little bit more and
>> turned off VFP feature and low and behold the task is working now!!
>> Hurray!! I don't know why VFP was causing all this headache but I'm glad
>> it's working.
>>
>> Thanks everybody for all help!
>
> Actually, what the VFP changes is the size of rtdm_task_t,

Ok, now that I come to think about it, enabling CONFIG_XENO_HW_FPU with 
CONFIG_VFP unconditionally uses VFP instructions during the context 
switch. Since this configuration does not make sense for any of the 
armv4 and armv5 processors supported by Xenomai, we will add a check at 
runtime so that xenomai will refuse starting in that case.

Regards.

-- 
					    Gilles.