Even at KERN_DEBUG, the following dmesg output is both overly excessive
(overall spew) and overly terse (each line is singularly uninformative
to anyone but code's author):
node 0 link 0: mmio [fa700000, fa8fffff]
node 1 link 0: mmio [fa900000, fa9fffff]
bus: 00 to node: 00
bus: 01 to node: 00
bus: 02 to node: 00
bus: 03 to node: 00
bus: 04 to node: 00
bus: 05 to node: 00
bus: 06 to node: 00
bus: 07 to node: 00
bus: 08 to node: 00
bus: 09 to node: 00
bus: 0a to node: 00
bus: 0b to node: 00
bus: 0c to node: 00
bus: 0d to node: 00
bus: 0e to node: 00
bus: 0f to node: 00
bus: 10 to node: 00
[... SPAM SPAM SPAM, let us count to 0xff, shall we? ...]
bus: fd to node: 01
bus: fe to node: 01
bus: ff to node: 01
bus: [00,3f] on node 0 link 0
bus: 00 index 0 io port: [2000, dfff]
