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This system's BIOS was not providing a complete PCI interrupt routing table, so the PCI drivers were not able to deduce the PCI interrupt assignment for the CardBus bridge. The bridge was still generating PCI interrupts, which locked up the system, because another device shared the same interrupt line, but that device's driver was unable to clear the CardBus bridge interrupt.
The problem was solved by explicitly telling the i82365 module the PCI interrupt assignment, with a startup option of:
PCIC_OPTS="pci_irq_list=11,11" (in this case, the bridge was configured for PCI irq 11) -- Dave
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