Hi, Alan But can we know if dev->irq is XT-PIC ? or not ? or could we know if IO_APIC or LOCAL_APIC is enabled or not ? on linux-2.6.17/drivers/pci/quirks.c * we must mask the PCI_INTERRUPT_LINE value versus 0xf to get * interrupts delivered properly. */ static void quirk_via_irq(struct pci_dev *dev) { u8 irq, new_irq; I want put here something like: if ( dev->irq != XT-PIC) return and don't quirk this dev. else new_irq = dev->irq & 0xf; pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq); On Wed, 2006-07-26 at 01:42 +0100, Alan Cox wrote: > A few comments > > "The legacy IDE is using IRQ 14 or 15 not PCI" > > This is half correct - V-Link is not involved in this case, however the > legacy IRQs are configurable and steerable via func 0 reg 0x4C for some > chips. If this has been set by a weirdass bios (bits 3-0 not 0x0100 for > the 8233C varies for others) then we've never supported it. > > > I have full IRQ routing info for some of the VIA chips and it varies by > chip how this all works. > > The 8233/8233C routes via register 0x4C/0x4D of function 0 for internal > devices and via 0x55->0x57 (polarities on 0x54) for PCI interrupts. The > devices use the IRQ number not line. Also to add fun the 8233C has a > 3com nic part that does this... > > There are then a seperate set of register mappings for SCI and for ISA > IRQ mapping. > > There is an errata with the internal devices of the 8235 and earlier > which can be used to detect them fairly well. Only the low four bits of > 0ffset 0x3C are writable not the full IRQ value. > > > Some later chips use bits to indicate PIC v APIC routing. > > - > 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/ -- Sérgio M.B.
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