15c0c44955
is the diagnostics register at offset 0x93. When bit 5 is set in this register, bits 4-7 in ExCA register 0x5 being 0000 are required for pci interrupt routing. When it is clear, then bit 4 of ExCA register 0x3 is used to enable it. The only other issue is that when you route interrupts this way, you must read ExCA register 0x4 in order to clear the interrupt, else you get an interrupt storm. Deal with this requirement by setting things up. It is believed that this won't hurt other chipsets, but other chipsets may require their own work arounds.
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