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Date: Thu, 15 Apr 2010 19:42:36 -0600
From: Peter Grehan <grehan@freebsd.org>
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Cc: Daniel Rodrick <daniel.rodrick@gmail.com>, freebsd-drivers@freebsd.org
Subject: Re: Multiple PCI controllers
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> I think there were not multiple-domain machines that FreeBSD ran on in 
> previous releases in general.

  Power Macs have up to 3 PCI buses, with each one having bus number 0 
at the host bridge. FreeBSD 6.* was fine with that, except if there was 
a conflict in bus/slot/function. Fortunately it looked like OpenFirmware 
was careful to avoid creating these conflicts when doing bus assignment.

later,

Peter.