This patch fixes a problem which prevents any version of the 2.4 kernel running on DECpc XL systems (from c. 1993). On that system, the NCR 53C810 SCSI subsystem integrated on the motherboard does not have a PCI class code, which breaks PCI resource allocation in all 2.4 kernels. The symptom is "resource collisions" reported for the SCSI device: PCI: Device 00:01.0 not available because of resource collisions These systems typically only have SCSI disks so the 2.4 kernel cannot be booted. If you are running an earlier kernel and want to know if you will have this problem when upgrading, use lspci -vvv and look for output similar to this: 00:01.0 Non-VGA unclassified device: Symbios Logic Inc. (formerly NCR) 53c810 (rev 01) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO; } +static void __devinit pci_fixup_ncr53c810(struct pci_dev *d) +{ + /* + * NCR 53C810 returns class code 0 (at least on some systems). + * Fix class to be PCI_CLASS_STORAGE_SCSI + */ + if (!d->class) { + printk("PCI: fixing NCR 53C810 class code for %s\n", d->slot_name); + d->class = PCI_CLASS_STORAGE_SCSI << 8; + } +} + static void __devinit pci_fixup_ide_bases(struct pci_dev *d) { int i; @@ -1148,6 +1160,7 @@ { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8622, pci_fixup_via_northbridge_bug }, { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8361, pci_fixup_via_northbridge_bug }, { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8367_0, pci_fixup_via_northbridge_bug }, + { PCI_FIXUP_HEADER, PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C810, pci_fixup_ncr53c810 }, { 0 } }; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/