[Xenomai] OMAP L138

Peter Howard pjh at northern-ridge.com.au
Tue Apr 15 23:59:55 CEST 2014


On Tue, 2014-04-15 at 13:37 +0200, Gilles Chanteperdrix wrote:
> On 04/15/2014 08:03 AM, Peter Howard wrote:
> > On Fri, 2014-04-11 at 08:52 +1000, Peter Howard wrote:
> >> On Fri, 2014-04-11 at 00:48 +0200, Gilles Chanteperdrix wrote:
> >>> On 04/11/2014 12:34 AM, Peter Howard wrote:
> >>>> On Fri, 2014-04-11 at 00:23 +0200, Gilles Chanteperdrix wrote:
> >>>> (Stripping back conversation on this one - apologies if that's bad
> >>>> etiquette for this list)
> >>>>  
> >>>>> Attachment is better. Also please post the changes you made for omapL138
> >>>>>
> >>>>
> >>>> diff --git a/arch/arm/mach-davinci/Kconfig b/arch/arm/mach-davinci/Kconfig
> >>>> index a075b3e..3d8bc59 100644
> >>>> --- a/arch/arm/mach-davinci/Kconfig
> >>>> +++ b/arch/arm/mach-davinci/Kconfig
> >>>> @@ -41,6 +41,8 @@ config ARCH_DAVINCI_DA850
> >>>>  	select ARCH_DAVINCI_DA8XX
> >>>>  	select ARCH_HAS_CPUFREQ
> >>>>  	select CP_INTC
> >>>> +    select IPIPE_ARM_KUSER_TSC if IPIPE
> >>>> +    select ARM_FCSE if IPIPE
> >>>
> >>> You may want to leave the choice of enabling or disabling FCSE to the user.
> >>>
> >>
> >> Understood; at the moment the variance on max latency is really bad if
> >> you don't enable FCSE.  When I sort out the crashing issues I'll re-test
> >> with it off.
> > 
> > Well, FCSE turned out to be my problem.
> > 
> > More specifically,  FCSE and ARM_FCSE_BEST_EFFORT.  Either a) disabling
> > ARM_FCSE altogether, or b) selecting ARM_FCSE with ARM_FCSE_GUARENTEED
> > gets rid of the crashes/panics with ipipe latency tracing enabled.
> > 
> > So now things seem reasonably stable, I'll go through the full set of
> > tests.  Though I still can't do 'xeno-test -l "dohell -l /opt/ltp"' as
> > ltp takes out the system without any ipipe/xenomai bits.
> > 
> Ok, FCSE best effort is currently being validated on 3.14, so it may
> well be broken. After all, the raw/* branches are work in progress.
> 

Note: selecting ARM_FCSE_BEST_EFFORT produces the same result on the
master branch too . . .

-- 
Peter Howard <pjh at northern-ridge.com.au>





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