Jan Kiszka wrote:
Wolfgang Grandegger wrote:
Gilles Chanteperdrix wrote:
Jan Kiszka wrote:
Wolfgang Grandegger wrote:
Hello,
I'm currently setting up a PC for Xenomai-Tests. I'm using my good old
PC with an Athlon XP (Thunderbird) for this purpose. The kernel
hangs at
boot time when I enable APIC via boot argument (lapic). With local APIC
disabled the kernel boots but I see some Opps messages while running
the
latency test and trying a slogin to the system (in the scheduler). Are
there any known issues with this X86 arch? I remember, that I have seen
similar problems with my (old) PIII-Notebook (lapic did not work).
No known issues, both scenarios *must* work, the P-III at least in PIC
mode when Linux refuses to enabled lapic on boot.
Some athlons have a buggy local APIC, so disabling it may be the best
option.
Ah, I found some similar statement on the RTAI mailing list as well.
Still, it must neither oops nor hang in this case - or does plain Linux
so as well?
On my Athlon, plain Linux boots and runs with the boot argument "lapic"
and reports that APIC is enabled, but I'm don't know if it's used. With
Xenomai in the kernel and "lapic" the kernel hangs shortly after the
Xenomai services have been successfully enabled. The Oops happened with
local APIC _disabled_ but I cannot reproduce it today. Likely a "make
clean" helped. And with the PIII, I just remembered that I had similar
problems half a year ago. Sorry for confusion. I have now a Xenomai test
PC up and running and was already able to test the PEAK CAN dongle :-).
The latency test reports latencies around 15..20us, which looks good.
Thanks.
Wolfgang.
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