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    SubjectRe: IBM Thinkpad G41 PCMCIA problems [Was: Yenta TI: ... no PCI interrupts. Fish. Please report.]


    On Sat, 19 Feb 2005, Steven Rostedt wrote:
    >
    > Here's the scoop:
    >
    > cat /proc/iomem:

    Ok. This one does not show device 00:1e.0 _at_all_. It had:

    I/O behind bridge: 00003000-00006fff
    Memory behind bridge: c2000000-cfffffff
    Prefetchable memory behind bridge: f0000000-f7ffffff

    and it just doesn't show. It shows some of the devices that are behind
    that bridge, though, and it should PCI Bus #01. Why not #02? Looks like we
    must have decided that that PCI bus is transparent.

    But we have the PCI device hierarchy right:

    > /sys/devices/pci0000:00/0000:00:1e.0/0000:02:00.0:
    > /sys/devices/pci0000:00/0000:00:1e.0/0000:02:01.0:
    > /sys/devices/pci0000:00/0000:00:1e.0/0000:02:01.1:
    > /sys/devices/pci0000:00/0000:00:1e.0/0000:02:02.0:

    Oh, and your dmesg does show:

    PCI: Transparent bridge - 0000:00:1e.0

    so that explains it. We believe that 0:1e.0 is transparent.

    Maybe we're even right. We do have a few quirky bridges that are marked
    transparent. I didn't think yours was one of them, though.

    I _think_ it's the code in arch/i386/pci/fixup.c that does this. See the

    static void __devinit pci_fixup_transparent_bridge(struct pci_dev *dev)

    thing, and try to disable it. Maybe that rule is wrong, and triggers much
    too often?

    Or maybe it really _is_ a transparent bridge after all, and the problem is
    somewhere else. Disabling the pci_fixup_transparent_bridge logic is a good
    thing to try first, though.

    Linus
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