[Xenomai-core] PORTING XENOMAI on ep9315 proccessor

[Xenomai-core] PORTING XENOMAI on ep9315 proccessor

[axel axel]

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HI

another question four you.

i'm a newbie of Xenomai and Ipipe, but i had to porting Xenomai on ARM9
Cirrus ep9315.

And so i ask me and you:

where and when is TSC( time stam counter ) used in Xenomai ? I try to know
reading the code but i don't understand good.

I explain it better.

Is it foundamental  the  implementation of TSC emulation  ( the hardware
doesn't have TSC, has only a free counter for debug  ) for the main
functionality of Xenomai OR
need only for the functions relative to exactly differences of time () ?

Thanks for All

Roberto Bielli

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Re: [Xenomai-core] PORTING XENOMAI on ep9315 proccessor

[Gilles Chanteperdrix]

On Jan 17, 2008 2:58 PM, axel axel <softaxel@domain.hid> wrote:
> HI
>
> another question four you.
>
> i'm a newbie of Xenomai and Ipipe, but i had to porting Xenomai on ARM9
> Cirrus ep9315.
>
> And so i ask me and you:
>
> where and when is TSC( time stam counter ) used in Xenomai ? I try to know
> reading the code but i don't understand good.
>
> I explain it better.
>
> Is it foundamental  the  implementation of TSC emulation  ( the hardware
> doesn't have TSC, has only a free counter for debug  ) for the main
> functionality of Xenomai OR
> need only for the functions relative to exactly differences of time () ?

Implementation of a TSC is mandatory, but the good news is that if
your hardware has a free running counter, the implementation is pretty
straightforward, and you have an example on Xenomai wiki:
http://www.xenomai.org/index.php/I-pipe:ArmPorting#Free-running_counters

-- 
                                               Gilles Chanteperdrix

Re: [Xenomai-core] PORTING XENOMAI on ep9315 proccessor

[Gilles Chanteperdrix]

On Jan 17, 2008 3:04 PM, Gilles Chanteperdrix
<gilles.chanteperdrix@xenomai.org> wrote:
>
> On Jan 17, 2008 2:58 PM, axel axel <softaxel@domain.hid> wrote:
> > HI
> >
> > another question four you.
> >
> > i'm a newbie of Xenomai and Ipipe, but i had to porting Xenomai on ARM9
> > Cirrus ep9315.
> >
> > And so i ask me and you:
> >
> > where and when is TSC( time stam counter ) used in Xenomai ? I try to know
> > reading the code but i don't understand good.
> >
> > I explain it better.
> >
> > Is it foundamental  the  implementation of TSC emulation  ( the hardware
> > doesn't have TSC, has only a free counter for debug  ) for the main
> > functionality of Xenomai OR
> > need only for the functions relative to exactly differences of time () ?
>
> Implementation of a TSC is mandatory, but the good news is that if
> your hardware has a free running counter, the implementation is pretty
> straightforward, and you have an example on Xenomai wiki:
> http://www.xenomai.org/index.php/I-pipe:ArmPorting#Free-running_counters

>From what I read in arch/arm/mach-ep93xx/core.c,
__raw_readl(EP93XX_TIMER4_VALUE_LOW) is a free-running counter that
can be used for the I-pipe TSC emulation.

-- 
                                               Gilles Chanteperdrix

Re: [Xenomai-core] PORTING XENOMAI on ep9315 proccessor

[Wolfgang Grandegger]

axel axel wrote:
> HI
> 
> another question four you.
> 
> i'm a newbie of Xenomai and Ipipe, but i had to porting Xenomai on ARM9
> Cirrus ep9315.

Are you aware of the following thread?

https://mail.gna.org/public/xenomai-core/2007-06/msg00022.html

Wolfgang.