Hi,
I found this out a long time ago on AT91 and worked around it but am
starting to see the same issue on hardware which hardware timer does not
wrap as fast: when xenomai calls ipipe_request_tickdev, the clockevent
structure max_delta_ns member is set to ULONG_MAX, but on most ARM
platforms, the reason for max_delta_ns is not only the timer hardware
limit, it is also necessary to call eg. update_sched_clock at least once
every max_delta_ns in order to avoid the hardware counter wrapping
without the system noticing it.
What do you think is the best way to avoid this issue? I would propose
simply removing the line which does:
evtdev->max_delta_ns = ULONG_MAX;
in ipipe_request_tickdev, but maybe someone else sees a better solution.
--
Gilles.
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