Tells setpci to be verbose and display detailed information about configuration space accesses. This option is intended for use in widely-distributed configuration scripts where it's uncertain whether the device in question is present in the machine or not. It's useful to try setpci -vD to see what your complex sequence of setpci operations does before you actually execute it. Before each sequence of operations you need to select which devices you wish that operation to affect. Select devices in specified bus, slot and function.
All numbers are hexadecimal.
The following options control parameters of the library, especially what access method it uses. Use direct hardware access via Intel configuration mechanism 1. Use direct hardware access via Intel configuration mechanism 2. This method is able to address only first 16 devices on any bus and it seems to be very unrealiable in many cases. Use PCI access syscalls.