> When the IDE controller works in legacy mode, the default IRQ for Ide0 > interface is 14 and IRQ for Ide1 interface is 15. The default interrupt > mode for IRQ14/15 is edge/high. If the interrupt of some PCI devices is > routed to IRQ14 or 15 and the interrupt mode is switched to Low/Level, > an exception will appear.(If the I/O APIC is used as the Interrupt > controller, IRQ14/15 nobody cared for. If the I8259 is used as the > interrupt controller, maybe some IDE interrupts will be lost). Yes. > In the Bug 5637: When the system works in acpi mode, there is no PCI > interrupt router for IDE pci device in ACPI tables and OS will guess an > interrupt for IDE PCI device, which is obtained from IDE PCI > configuration space(The IRQ number is 15). OS will register the IRQ 15 > using acpi_register_gsi and switch the interrupt mode of IRQ 15 to > Low/level. Because the interrupt mode for IRQ 15 is uncorrect, there > will be interrupt flood and the system reports: IRQ 15 nobody cared. > > How to fix this issue? Is IRQ 14/15 always reserved for the IDE > device? No. If the IDE device is in legacy mode then the IRQ is fixed at 14/15 for the two channels. If it is in PCI mode then the PCI and ACPI routing applies. This is defined in the header of the IDE device. Class STORAGE:IDE Programming class bit 0 -> channel 0 is legacy (0x1F0, 0x3F6, 14) Programming class bit 2 -> channel 1 is legacy (0x170, 0x376. 15) - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
