[Bug 238730] r349985 on ppc64 IBM 970MP PowerMac G5 possible panic in bus_generic_new_pass

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238730

--- Comment #20 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Dennis Clarke from comment #19)

> Well clearly the net interface re-order is still here. 

usefdt=1 reverses the order of sibling nodes in
OpenFirmware (item (D) of my list of known usefdt
issues). The net interface re-order is one of the
consequences. Others are worse (as I remember):
wrong nodes found and used via the likes of just
looking up the first child of first child in the
FreeBSD code. (This would be fine if there were no
siblings at either level but I no longer remember
such detail for what prompted the example.)

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