From: James Bottomley <James.Bottomley@SteelEye.com>
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 first BAR is the actual IO-APIC, the remaining five bars seem to be
spurious resources, so we forcibly insert the first one into the resource
tree and clear all the others.
---
25-akpm/drivers/pci/quirks.c | 24 ++++++++++++++++++++++++
25-akpm/include/linux/pci_ids.h | 1 +
2 files changed, 25 insertions(+)
diff -puN drivers/pci/quirks.c~alder-io_apic-quirk drivers/pci/quirks.c
--- 25/drivers/pci/quirks.c~alder-io_apic-quirk Fri Feb 20 16:14:00 2004
+++ 25-akpm/drivers/pci/quirks.c Fri Feb 20 16:14:00 2004
@@ -789,6 +789,29 @@ static void __init quirk_sis_96x_compati
sis_96x_compatible = 1;
}
+#ifdef CONFIG_X86_IO_APIC
+static void __init quirk_alder_ioapic(struct pci_dev *pdev)
+{
+ int i;
+
+ if ((pdev->class >> 8) != 0xff00)
+ return;
+
+ /* the first BAR is the location of the IO APIC...we must
+ * not touch this (and it's already covered by the fixmap), so
+ * forcibly insert it into the resource tree */
+ if(pci_resource_start(pdev, 0) && pci_resource_len(pdev, 0))
+ insert_resource(&iomem_resource, &pdev->resource[0]);
+
+ /* The next five BARs all seem to be rubbish, so just clean
+ * them out */
+ for(i=1; i < 6; i++) {
+ memset(&pdev->resource[i], 0, sizeof(pdev->resource[i]));
+ }
+
+}
+#endif
+
#ifdef CONFIG_SCSI_SATA
static void __init quirk_intel_ide_combined(struct pci_dev *pdev)
{
@@ -914,6 +937,7 @@ static struct pci_fixup pci_fixups[] __d
{ 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 -puN include/linux/pci_ids.h~alder-io_apic-quirk include/linux/pci_ids.h
--- 25/include/linux/pci_ids.h~alder-io_apic-quirk Fri Feb 20 16:14:00 2004
+++ 25-akpm/include/linux/pci_ids.h Fri Feb 20 16:14:00 2004
@@ -1928,6 +1928,7 @@
#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
_