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

[Arnaud Degroote <arnaud.degroote@isae.fr>]

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:
> >>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
> >>>>>
> >>>>> On 06/30/2014 05:45 PM, Arnaud Degroote wrote:
> >>>>>> On 30/Jun - 17:26, Gilles Chanteperdrix wrote:
> >>>>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
> >>>>>>>
> >>>>>>> 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.
> 
> 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.
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