From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <53FF33CE.10303@xenomai.org> Date: Thu, 28 Aug 2014 15:51:10 +0200 From: Gilles Chanteperdrix MIME-Version: 1.0 References: <53FDFD27.2010207@xenomai.org> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai] ODROID-U3 porting problems List-Id: Discussions about the Xenomai project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: GP Orcullo Cc: xenomai@xenomai.org On 08/28/2014 03:45 PM, GP Orcullo wrote: > On Wed, Aug 27, 2014 at 11:45 PM, Gilles Chanteperdrix >> So, this is a cortex a9. On Cortex a9, Xenomai tries to use the global >> timer for tsc emulation. Are you sure this processor has a global timer? >> Again, running the "tsc" program will help you see if the tsc emulation >> is working correctly. > > AFAIK, the exynos soc doesn't use twd - they have a multi-core timer > instead. There is one global timer and a local timer for each core. > > BTW, is it necessary that there should be an ipipe timer for each core > or a single > "global" one will do? The global timer is not the same thing as the twd, and I was talking about using the global timer as a clock source (for tsc emulation), not as a timer, the advantage being that you would have a much better resolution. Xenomai indeed requires local timer support (for which it uses twd on cortex a9), that is one timer per core. -- Gilles.