Re: [Xenomai-help] Shared interrupt :(

[Jan Kiszka <jan.kiszka@domain.hid>]

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bite wrote:
> Hi, this is my first post, I'm using Xenomai since a few days, I beg your
> pardon if my question has already been answered.
> 
> My problem is not directly related to Xenomai, but it prevents me from using
> Xenomai (as well as any other kind of realtime extension, I think).
> 
> The point is: I have a PCI axis control board and with Xenomai I can use it
> well on some kind of hardware.
> 
> On a different machine, the irq of this board happens to be shared with an
> usb irq, and I get lots of problems there. Erratic behaviour, pc hanging and
> killed cats.
> 
> Things do not change if I include I_PROPAGATE in the interrupt mode flags.
> 
> I recompiled the kernel with IO_APIC and LOCAL_APIC set, but what happens
> then is just that the conflicting interrupts both move together, hand in
> hand, from the same irq 9 to the same irq 18 :) Shame!
> 
> Is there any known solution for this embarrassing problem? Somebody
> suggested me to put the board in a different PCI slot, but unluckily I
> cannot do so because of a geometric constraint.

This is really a FAQ in this list, and if I weren't too busy, I would
now take the chance and hack up a wiki page on this. Please browse the
mailing list archives for the shared irq topic. And if you (anyone else
is invited as well) would like to do us a favour, put what you find into
a new wiki FAQ page on xenomai.org so that we can simply cite it on
future postings like this. :)

Jan

PS: If you stumble over the RT-IRQ-stub-for-Linux-devices approach in
the archive: I have some idea to ease the development, but it is stalled
due the limited time to work it out. If you feel like you need such a
stub, I can tell you more, just ask again.


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