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Date: Sun, 3 Feb 2008 22:49:49 -0700
From: John E Hein <jhein@timing.com>
To: grehan@freebsd.org
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Cc: cvs-src@freebsd.org, Scott Long <scottl@samsco.org>,
	src-committers@freebsd.org, John Baldwin <jhb@freebsd.org>,
	cvs-all@freebsd.org
Subject: Re: cvs commit: src/sys/dev/pci pci.c
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Peter Grehan wrote at 19:00 -0800 on Feb  1, 2008:
 > > I'm sure there are fun, interesting, and highly obtuse ways to get a
 > > PCI-E device onto a system with no PCI-E root complex.
 > 
 >   Be afraid ...
 > 
 >     http://www.pericom.com/products/pci/
 > 
 >   "In ?reverse? mode, the PI7C9X110 is configured with the PCI port on 
 > the primary and the PCI Express port on the downstream side. The 
 > ?reverse? configuration will be mainly used to ?bridge? new PCI Express 
 > products to legacy PCI systems."

PLX (plxtech.com) also has them.