On Tuesday, 18 September 2007 15:57, linux-os (Dick Johnson) wrote:
>
> On Tue, 18 Sep 2007 [email protected] wrote:
>
> >
> > I have a CAN PCI card installed on my Ubuntu box.
> > I understand that PCI interrupts should be level rather than edge
> > triggered.
> >
> > The output of cat /proc/interrupts is :-
> >
> > CPU0
> > 0: 1614601 IO-APIC-edge timer
> > 1: 164 IO-APIC-edge i8042
> > 8: 3 IO-APIC-edge rtc
> > 9: 1 IO-APIC-level acpi
> > 12: 0 IO-APIC-edge CAN-ACx-PCI_01
> > 14: 65786 IO-APIC-edge ide0
> > 169: 3220 IO-APIC-level eth0, i915@pci:0000:00:02.0
> > 177: 46459 IO-APIC-level eth1
> > 209: 0 IO-APIC-level uhci_hcd:usb3, eth2
> > 217: 2 IO-APIC-level uhci_hcd:usb1, ehci_hcd:usb4
> > 225: 697 IO-APIC-level uhci_hcd:usb2
> > NMI: 0
> > LOC: 1614399
> > ERR: 0
> > MIS: 0
> >
> > You see that irq 12 CAN-ACx-PCI_01 is edge triggered.
> > Is there any way of forcing the BIOS to see the interrupt as a
> > level-triggered one?
>
> It's done in the driver. IRQ12 can be shared, so the driver
> needs to request the IRQ as a shared interrupt.
Hm, edge-triggered interrupts cannot be shared, AFAIK.
Greetings,
Rafael
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