root
 \-mainbus0
    |-cpu0
    \-psycho0
       \-pci0
          |-ppb0
          |  \-pci1
          |     |-ebus0
          |     |  |-audioce0
          |     |  |  \-audio0
          |     |  |-auxio0
          |     |  |-clock0
          |     |  |-com0
          |     |  |-comkbd0
          |     |  |  \-wskbd0
          |     |  |-lpt0
          |     |  \-sab0
          |     |     |-sabtty0
          |     |     \-sabtty1
          |     |-hme0
          |     |  \-nsphy0
          |     |-pciide0
          |     |  |-wd0
          |     |  \-wd1
          |     \-vgafb0
          |        \-wsdisplay0
          \-ppb1
             \-pci2