reordering pci interrupts?
I have a motherboard with a broken bios that is unable to set interrupts correctly, i.e. it initializes the devices corerctly but swaps the interrupts for slot1/slot3 and slot2/slot4.
Now, is there a way to forcefully re-order the pci-interrupts? I do not have an io-apic (thus no pirq=xxx), and I tried to poke the interrupt values directly into /proc/bus/pic/*/*, but the kernel has it's own idea.
Thanks a lot for any info (I guess I'll just patch the kernel).
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Quoted 9 lines
I have a motherboard with a broken bios that is unable to set interrupts correctly, i.e. it initializes the devices corerctly but swaps the interrupts for slot1/slot3 and slot2/slot4.
Now, is there a way to forcefully re-order the pci-interrupts? I do not have an io-apic (thus no pirq=xxx), and I tried to poke the interrupt values directly into
/proc/bus/pic/*/*, but the kernel has it's own idea.Thanks a lot for any info (I guess I'll just patch the kernel).
Please try this patch and boot with "pci=autoirq" on the kernel command line.
Have a nice fortnight
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Martin `MJ' Mares <[email protected]> <[email protected]> http://atrey.karlin.mff.cuni.cz/~mj/ "veni, vidi, nuclei deceiri - I came, I saw, I core dumped" --- arch/i386/kernel/pci-pc.c.mj Sun Nov 19 20:18:14 2000 +++ arch/i386/kernel/pci-pc.c Sun Nov 19 20:18:14 2000 @@ -1035,6 +1035,9 @@ } else if (!strncmp(str, "lastbus=", 8)) { pcibios_last_bus = simple_strtol(str+8, NULL, 0); return NULL; + } else if (!strcmp(str, "autoirq")) { + pci_probe |= PCI_AUTOIRQ; + return NULL; } return str; } --- arch/i386/kernel/pci-i386.h.mj Sun Nov 19 20:18:32 2000 +++ arch/i386/kernel/pci-i386.h Sun Nov 19 20:18:32 2000 @@ -18,6 +18,7 @@ #define PCI_NO_SORT 0x100 #define PCI_BIOS_SORT 0x200 #define PCI_NO_CHECKS 0x400 +#define PCI_AUTOIRQ 0x800 #define PCI_ASSIGN_ROMS 0x1000 #define PCI_BIOS_IRQ_SCAN 0x2000 --- arch/i386/kernel/pci-irq.c.mj Sun Nov 19 20:18:50 2000 +++ arch/i386/kernel/pci-irq.c Sun Nov 19 20:18:50 2000 @@ -487,7 +487,7 @@ * If the BIOS has set an out of range IRQ number, just ignore it. * Also keep track of which IRQ's are already in use. */ - if (dev->irq >= 16) { + if (dev->irq >= 16 || (pci_probe & PCI_AUTOIRQ)) { DBG("%s: ignoring bogus IRQ %d\n", dev->slot_name, dev->irq); dev->irq = 0; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] Please read the FAQ at http://www.tux.org/lkml/