Hi, I happened to switch on some CPU type that enabled the Xenomai's TSC emulation code. The result was an ugly lock-up: endless loop in the timer IRQ handler.
The reason: the TSC emulation collides with the VT sound output / the PC speaker driver. Over 2.6, one can easily avoid this my switching off CONFIG_INPUT_PCSPKR. 2.4 requires to export and than manipulate kb_mksound (the pointer to the sound generating code). The latter pointer rang some bell. I once fixed a broken RTAI build due to that code. So I pulled out vulcano and actually found the related code + an extension of the original ipipe patch to export kb_mksound. I guess it would have been too complicated for Paolo to explain the reason of this export to us... Anyway, this digging revealed another potential breakage in the emulation code: RTAI takes care to read the emulated TSC at least once per 50 ms, to avoid overflows I assume. Xenomai does not. Before spending "some" time on a clean (in contrast to what I just read in foreign code...) fix for Xenomai, I would like to cross-check if this emulation is still considered useful. No one seems to use it, otherwise we should have received complaints much earlier. Fix it or drop it? Jan
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