A number of buggy BIOS implementations leave the router

entry as 000:00:0, which is typically not the correct
device/function.  If the router device address is set to
this value, and the compatible router entry is undefined
(zero is the correct value to indicate undefined), then we
work on the basis it is most likely an error, and search
the entire device-space of bus 0 (but obviously starting
with 000:00:0, in case that really is the right one).
from Dave Sainty <dave@dtsp.co.nz>

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