tsunami systems and the PCI bus-numbering system of FreeBSD. Eg, the former
allows for 2 PCI bus 2's (one each on hoses 0 and 1) while the latter
needs to give each PCI bus a unique monotonically increasing number.
It has been fairly well tested and correctly maps machines with a ppb on
hose 1 as well as machines with ppbs on both hoses.
DS10s remain untested, as I do not have a pci card with a ppb which will
pass POST in a tsunami.
This is a house of cards.
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