I have a plx9056-based data capture board that works with the winXP drivers (based off of the win32 plx sdk) but does not work with the linux driver provided to me. The board constitently gets 0xa (IRQ 10) in the INTERRUPT_LINE register but the IO-APIC reports IRQ 49 to the kernel. To add to the confusion when an interrupt is triggered it arrives on IRQ 17 causing an irq disable. When run with `noapic` on the kernel bootline a consistent irq 10 is observed and the driver behaves correctly. When `irqpoll` is given the driver behaves correctly(kernel complains about irq 10 being the registered irq handler) though it causes other kernel problems. The following options have been tried in isolation with no success: pci=nommconf; pci=conf2 (noboot); acpi=bigsmp; pci=routeirq (kernel output changes, but no change in behavior); pci=noacpi acpi=noirq (seems identical to pci=routeirq); acpi=irq_balance; apic=debug.
I'm running primarily in a Dell precision 370n workstation with 3 PCI-X slots. The irq reported in by the IO-APIC changes depending on which slot I plug it in. Slot INTERRUPT_LINE IO-APIC Observed 1 10 49 17 2 10 53 17 3 9 26 18 The same general behavior has been observed in _every_ linux machine I've been able to plug this card into that had an IO-APIC. These were mostly Intel chipsets but I 've also had it in a Tyan 8-proc AMD board with a Nvidia chipset with the same interrupt issues. I see two problems: first, the INTERRUPT_LINE register on the card is not consistent with either the APIC reported irq or the actual irq. Second, that the IO_APIC, which is supposed to maintain a mapping of its pins to a particular irq, is inconsistent in what IRQ is reported for a particular pin (different slots result in different irqs reported, but still actually use irq 17). I'm not a LKML subscriber so please CC to brett.boren_at_gmail_dot_com. Thanks, Brett - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
