when you try to read undefined portions of the config space (this behavior probably
doesn't violate the PCI standard, but it's at least very stupid).
.TP
+.B -xxxx
+Show hexadecimal dump of the extended PCI configuration space.
+.TP
.B -b
Bus-centric view. Show all IRQ numbers and addresses as seen by the cards on the
PCI bus instead of as seen by the kernel.