We (Adeneo) are working on a ARM AT91 RTAI. We encountered some 
difficulties such tsc one : in periodic mode, we reload our timer automatically 
in order to avoid reprogramming it. TC timer increments a 16 byte register, 
which is not enough for a tsc (64 bytes). tsc need to be emulated on ARM.
                With oneshot mode, tsc is updating the 4 least significant 
bytes and then increments other bytes each time counter go back to zero value.

                With our periodic mode, timer reloads himself so we need to 
change tsc emulation by incrementing tsc like this : tsc += period.
                We made some evolutions on ipipe which will be applied to a hal 

                Are you interrested in a such patch for a periodic mode on ARM ?

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