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    SubjectRe: PROBLEM: Devices behind PCI Express-to-PCI bridge not mapped
    On Fri, Jun 03, 2005 at 09:50:13PM -0700, Linus Torvalds wrote:
    > Usually the easiest way to match up things is to just do
    >
    > x/10i pci_setup_bridge+0x1a2
    >
    > and match it up with "make drivers/pci/setup-bus.s".

    OK, here's some more info (now visible on an 80x60 FB console):

    1) I can see a couple of messages

    PCI: Failed to allocate mem resource #10:2000000@80000000 for 0000:06:09.1
    ...
    followed by

    PCI: Bus 7, cardbus bridge: 0000:06:09.0
    IO window: 00005000-00005fff
    IO window: 00006000-00006fff
    PREFETCH window: 80000000-81ffffff
    MEM window: 80000000-81ffffff
    , repeated for busses 11 and 15 of the cardbus bridge. This is the
    notebook-internal cardbus bridge (see lspci in previous mail).

    2) The last messages right before the oops are

    PCI: Bridge 0000:00:1e.0
    IO window 1000-6fff
    MEM window: 01000000-0dffffff
    This is the Southbridge to the notebook-internal PCI bus 0000:06
    3) The oops itself occurs when attempting to setup the PREFETCH window of
    that bridge and begins

    Unable to handle kernel NULL pointer dereference at virtual address 00000004
    Specifically, it is located at the call of

    pcibios_resource_to_bus(bridge, &region, bus->resource[2]);

    in drivers/pci/setup-bus.c, line 202. I confirmed that
    bus->resource[2] is indeed NULL at that time.

    Interestingly, the PCI Express-to-PCI bus in the docking station
    appears _not_ to be involved in this crash.

    As usual, please let me know what additional info would be useful.

    Andreas
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