Re: [Xenomai] Support of Beagleboard xm rev C on 3.14-ipipe

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

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On 07/01/2014 10:39 AM, Arnaud Degroote wrote:
> On 30/Jun - 21:06, Gilles Chanteperdrix wrote:
>> On 06/30/2014 08:41 PM, DEGROOTE Arnaud wrote:
>>> 
>>> On Monday, June 30, 2014 18:13 CEST, Gilles Chanteperdrix
>>> <gilles.chanteperdrix@xenomai.org> wrote:
>>> 
>>> On 06/30/2014 06:06 PM, Arnaud Degroote wrote:
>>>>>> On 30/Jun - 17:48, Gilles Chanteperdrix wrote:
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>>>>>>> On 06/30/2014 05:45 PM, Arnaud Degroote wrote:
>>>>>>>> On 30/Jun - 17:26, Gilles Chanteperdrix wrote:
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>>>>>>>>> 
>>>>>>>>> On 06/30/2014 05:18 PM, Arnaud Degroote wrote:
>>>>>>>>>> On 30/Jun - 14:37, Arnaud Degroote wrote: [snip]
>>>>>>>>>>>> Have you checked that the exact same kernel 
>>>>>>>>>>>> configuration, only without CONFIG_IPIPE and
>>>>>>>>>>>>  CONFIG_XENOMAI runs correctly under load?
>>>>>>>>>>> 
>>>>>>>>>>> The system seems to hang even without
>>>>>>>>>>> CONFIG_IPIPE. The linux-yocto kernel seems to
>>>>>>>>>>> work properly (it looks like a 3.14rc8), I will
>>>>>>>>>>> check precisely against linux kernel v3.14.
>>>>>>>>>> 
>>>>>>>>>> Some additional information
>>>>>>>>>> 
>>>>>>>>>> linux mainstream kernel on tag v3.14 runs fine on
>>>>>>>>>> the platform. The system hangs with ipipe branch
>>>>>>>>>> ipipe-3.14 (without xenomai stuff, and without
>>>>>>>>>> CONFIG_IPIPE).
>>>>>>>>> 
>>>>>>>>> In the two cases the configuration is exactly the
>>>>>>>>> same?
>>>>>>>>> 
>>>>>>>> Yes, there are no semantic difference. The only diff
>>>>>>>> are
>>>>>>>> 
>>>>>>>> CONFIG_LOCALVERSION
>>>>>>>> 
>>>>>>>> and the ipipe kernel has the extra line
>>>>>>>> 
>>>>>>>> # CONFIG_IPIPE is not set
>>>>>>>> 
>>>>>>> If you have a rootfs without hardfp (based on the
>>>>>>> codesourcery toolchain for instance), could you try to
>>>>>>> boot without CONFIG_VFP?
>>>>>> 
>>>>>> I don't have such toolchain for the moment, but I can try
>>>>>> to hack
>>> 
>>>>>> my current yocto toolchain to test without hardfp.
>>> 
>>> The codesourcery toolchain is available for download, already
>>> compiled.
>>> 
>>>>>> Still, I have compiled a kernel without CONFIG_VFP but it
>>>>>> still hangs in the same place, so I don't think it is
>>>>>> related to the current issue.
>>> 
>>> If you are running a rootfs with hardfp with a kernel without 
>>> CONFIG_VFP, the system should not finish booting.
>>> 
>>>> Yes obviously, but at the moment, I don't arrive to the call
>>>> to /sbin/init
>>> 
>>> Where does the system hang exactly? We were talking about a
>>> hang when running switchtest. How do you produce the hang on a
>>> system without CONFIG_XENOMAI, since obviously you can not run
>>> switchtest?
>>> 
>>>> Yes, sorry, I was not very precise.  I get the same behaviour
>>>> than described in the beginning of the thread, i.e. the
>>>> kernel hangs during the boot (and nothing happens after
>>>> that). As I said previously, the hang happens with
>>>> linux-ipipe without CONFIG_IPIPE. The various change of
>>>> configuration makes it "work" by accident.
>>> 
>>>> An hanging kernel boot msg is available on my mail of 24
>>>> June, 14:21 CEST. I cannont reproduce it at the moment, as
>>>> I'm not anymore at work.
>> 
>> As I said in an earlier mail, please do not mix everything, and
>> try and debug one issue at the time.
>> 
>> From your configuration I gather you do not use the serial
>> console (CONFIG_PINCTRL_SINGLE is missing), could you enable the
>> serial console to try and obtain more information about this
>> kernel freeze?
> 
> I'm already using the serial console. PINCTRL_SINGLE is not
> necessary for beagleboard xM AFAIU.

Finding a reproducible freeze location is relatively easy, enable
CONFIG_DEBUG_LL, and put calls to printascii in the initialization
functions, starting with init/main.c, and refining inside these
functions when you know a bit more.

>> 
>> Or alternatively, could you restore the configuration options
>> which "get the system working", so that we can go back to what we
>> were testing: the configuration where switchtest hangs, without
>> CONFIG_IPIPE, and generate some load with the hackbench test, to
>> try and simulate a bit what switchtest is doing. I am also
>> interested by the same configuration with CONFIG_XENOMAI, but
>> without CONFIG_VFP, and running the switchtest rtk0 rtk0 test.
> 
> I don't have any working configuration with linux-ipipe without 
> CONFIG_IPIPE, it always hang during the boot, through I don't try
> yet with CONFIG_IPIPE, without CONFIG_XENOMAI. Does it make any
> sense to do some test in this configuration ?
> 
> Otherwise, I will build a toolchain without hardfp to do the last
> test.

As I said, you can install the codesourcery toolchain, you do not need
to build it. Anyway, let us wait to know in what function the freeze
occurs.

- -- 
                                                                Gilles.
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