Karl Reichert wrote: > -------- Original-Nachricht -------- > Datum: Thu, 29 Mar 2007 10:34:31 +0200 > Von: Jan Kiszka <[EMAIL PROTECTED]> > An: Karl Reichert <[EMAIL PROTECTED]> > CC: [email protected] > Betreff: Re: [RTnet-developers] RTnet port for Tricore? > >> Karl Reichert wrote: >>> Hello all, >>> >>> is there any work done porting RTnet on tricore from Infineon? >>> >>> What do you think, how much work would it be, writing an ethernet driver >> for RTnet for triboard 1130 NIC? I'm talking about a direct >> implementation, so no RTLinux like Xenomai/RTAI underneath. >> >> On bare metal? No OS at all? Feasible, for sure. It's much like hacking >> RTmac/TDMA (I suppose that is your goal) into Etherboot, see the old >> patches. The basic TDMA support was fairly small code, just suffering a >> bit from our lacking standardised format for transmitting the TDMA >> configuration to the slaves (you will see the shell script parser in the >> patch...). Additionally, I had to add high resolution timer support to >> Etherboot. >> >> The advantage of bare-metal RTnet clearly is that you can achieve very >> low jitters for frame timing and time stamp synchronisation. Basically, >> you should get into the region which Ethernet Powerlink reaches as well >> by dedicating separate controllers on their protocol handling. I would >> be very interested to hear about your experiences! >> >> Jan >> > > Well, I'm still reading lots of papers to evaluate things, but as far as I > understood until now, there are two possible ways how to do: > a) As there is no port of etherboot to the tricore architecture, I first have > to port it to this and then using the old patches and hacking them into > etherboot. > b) Implementing the RTnet spec directly on the tricore itself, which means, > without using etherboot. > > Would you agree with that or do you have any other ideas? > > What would you consider to be less work, if you can tell?
Go for b), unless you want features of Etherboot as well (boot image download...). I gave the reference just to study the TDMA patch, not the whole Etherboot design. What will be the application of that port? Means: what control structure will your code on tricore have, what communication will take place (periodic data reception or delivery, interactive traffic)? Or do you plan to write an RTnet library, ie. something totally generic? That's relevant when considering possible designs of the RTnet state machines. Jan
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