From owner-freebsd-hackers@FreeBSD.ORG  Mon Apr 10 00:55:35 2006
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Date: Sun, 09 Apr 2006 18:53:35 -0600 (MDT)
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To: mwm-keyword-freebsdhackers.102a7e@mired.org
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: hackers@freebsd.org, babkin@users.sourceforge.net, ceri@submonkey.net,
	scottl@samsco.org
Subject: Re: What's in a (device) name?
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In message: <17465.32905.727289.260996@bhuda.mired.org>
            Mike Meyer <mwm-keyword-freebsdhackers.102a7e@mired.org> writes:
: The major problem with it is that todays bus architectures don't have
: stable device addresses. Instead of devices having a fixed address on
: the bus that the user sets, the addresses are assigned as the devices
: are discovered. This is pretty much a requirement if you want to sell
: hardware to 12:00 flashers. While that's not the market that FreeBSD
: deals with, it is the hardware that FreeBSD runs on.

usb assigns addresses dynamically.  Everyone else does it basically
statically.  PCI slot/device numbers are static, but extreme
configurations can change the bus number.

Warner