Gilles Chanteperdrix wrote: > Jan Kiszka wrote: >> Gilles Chanteperdrix wrote: >>> Daniele Nicolodi wrote: >>>> Booting a working 2.6.30 kernel I noticed this error message as first >>>> output on the console. Can it be related to my issue with more modern >>>> kernels and ipipe patches? >>>> >>>> ERROR: 8254 timer not connected to IO-APIC >>>> >>>> I have no idea of what it means. >>> Is APIC enabled in your kernel configuration? >> It likely is. >> >> I'm getting this error for many kernel releases now. It must be related >> to I-pipe's patching of the APIC or IO-APIC code. Irritating but mostly >> harmless. > > What I mean is that when Xenomai wants to use the 8254 (which is the > case if the APIC is disabled in linux kernel configuration) and the 8254 > has become unreachable by Linux by some change in recent versions, > Xenomai timing subystem becomes screwed up. > > When, on the other hand, Xenomai wants to use the APIC, the fact that > the 8254 has become unreachable is harmless.
...but people continue to report this as bug. > > And from the .config Daniele posted, it appears that he disabled APIC, > so that Xenomai is trying to use the 8254. Right. And the HPET is on, so this programmed to fail. Daniele, please enable CONFIG_X86_UP_APIC or disable CONFIG_HPET_TIMER - just as Kconfig warned you. Jan
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