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    Subject[PATCH] Intel Alder IOAPIC fix
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    The intel alder motherboard really dislikes the way the current kernel
    reassigns all PCI resources. It exports 6 memory bars from its Extended
    Express System Support Controller, but if the system touches any of
    them, it disables the secondary IO-APIC.

    The system is bootable if you disable all IO-APICs apart from the
    primary, but it does become a bit crowded in interrupt space. The patch
    fixes the problem by adding a quirk to clear the first six memory bars.

    James

    # This is a BitKeeper generated patch for the following project:
    # Project Name: Linux kernel tree
    # This patch format is intended for GNU patch command version 2.5 or higher.
    # This patch includes the following deltas:
    # ChangeSet 1.1530 -> 1.1531
    # drivers/pci/quirks.c 1.38 -> 1.39
    # include/linux/pci_ids.h 1.130 -> 1.131
    #
    # The following is the BitKeeper ChangeSet Log
    # --------------------------------------------
    # 04/01/11 root@claymoor.il.steeleye.com 1.1531
    # Fix intel alder boot failure
    #
    # The alder has an intel Extended Express System Support Controller
    # which presents apparently spurious BARs. When the pci resource
    # code tries to reassign these BARs, the second IO-APIC gets disabled
    # (with disastrous consequences).
    #
    # The patch adds a quirk to clear these BARs.
    # --------------------------------------------
    #
    diff -Nru a/drivers/pci/quirks.c b/drivers/pci/quirks.c
    --- a/drivers/pci/quirks.c Sun Jan 11 20:51:06 2004
    +++ b/drivers/pci/quirks.c Sun Jan 11 20:51:06 2004
    @@ -786,6 +786,28 @@
    sis_96x_compatible = 1;
    }

    +#ifdef CONFIG_X86_IO_APIC
    +static void __init quirk_alder_ioapic(struct pci_dev *pdev)
    +{
    + struct resource *res;
    + int i;
    +
    + if ((pdev->class >> 8) != 0xff00)
    + return;
    +
    + res = &pdev->resource[0];
    + /* The first six bars must be cleared otherwise the IO-APIC
    + * will throw a wobbly when the pci resource allocation tries
    + * to reassign them */
    + for(i=0; i < 6; i++) {
    + res[i].start = 0;
    + res[i].end = 0;
    + res[i].flags = 0;
    + }
    +
    +}
    +#endif
    +
    #ifdef CONFIG_SCSI_SATA
    static void __init quirk_intel_ide_combined(struct pci_dev *pdev)
    {
    @@ -910,6 +932,7 @@
    { PCI_FIXUP_FINAL, PCI_VENDOR_ID_SI, PCI_ANY_ID, quirk_ioapic_rmw },
    { PCI_FIXUP_FINAL, PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_APIC,
    quirk_amd_8131_ioapic },
    + { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EESSC, quirk_alder_ioapic },
    #endif
    { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3, quirk_via_acpi },
    { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4, quirk_via_acpi },
    diff -Nru a/include/linux/pci_ids.h b/include/linux/pci_ids.h
    --- a/include/linux/pci_ids.h Sun Jan 11 20:51:06 2004
    +++ b/include/linux/pci_ids.h Sun Jan 11 20:51:06 2004
    @@ -1901,6 +1901,7 @@
    #define PCI_DEVICE_ID_GENROCO_HFP832 0x0003

    #define PCI_VENDOR_ID_INTEL 0x8086
    +#define PCI_DEVICE_ID_INTEL_EESSC 0x0008
    #define PCI_DEVICE_ID_INTEL_21145 0x0039
    #define PCI_DEVICE_ID_INTEL_82375 0x0482
    #define PCI_DEVICE_ID_INTEL_82424 0x0483
    -
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