Re: [Adeos-main] Re: Re: Porting to Intel IXP425

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

Schlägl Manfred jun. wrote:
> Am Montag, den 02.04.2007, 08:52 +0200 schrieb Richard Cochran:
> 
>>>This is needed for machines where the hardware timer is based on a
>>>decrementer. But for machines with a free-running counter and a match
>>>register, reading the value of the free-running counter is
>>>simpler. IXP425 is in the  "free-running counter and match register
>>>category". So, its implementation should look like the one of the PXA.
>>
>>The IXP425 does not have a match register, AFAICT.
>>
>>It does have four 32-bit counters clocked at 66.66 MHz: a watch dog, a
>>free-running timestamp, and two general purpose timers.
>>
>>The general purpose timers may be used either as one-shot timers
>>(count down to zero and stop) or as periodic times (count down,
>>automatically reload, and keep going).
>>
>>I already have xenomai running on the IXP425, but I will have to take
>>a closer look at the timer code.
>>
>>Richard
> 
> 
> Then you have to implement it like I described. 
> 
> Take a look at the implementation for integrator-platforms.
> (Timer with wraparound)

I have tried to put together on Xenomai wiki some ideas on porting the
ARM I-pipe patch on a new platform. I have not explained the case of the
integrator, in the hope that others who know better could modify the howto.

http://www.xenomai.org/index.php/I-pipe:ArmPorting

-- 
                                                 Gilles Chanteperdrix