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From: naddy@mips.inka.de (Christian Weisgerber)
Subject: 9->10: USB device number changes
Date: Sat, 4 Jan 2014 16:41:43 +0000 (UTC)
Message-ID: <la9dk7$30ot$1@lorvorc.mips.inka.de>
Originator: naddy@mips.inka.de (Christian Weisgerber)
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If you're going from FreeBSD 9 to 10, the attach order of USB devices
may change.

FreeBSD 9's GENERIC kernel has various USB drivers compiled in.  On
10, only a few core drivers remain in GENERIC and drivers for other
devices are loaded dynamically as kernel modules by devd(8).  As a
side effect, the attach order and thus the numbering may change.

Specifically, I have four ucom(4) adapters on a machine, a mix of
three uplcom(4) and one uftdi(4) device.  On FreeBSD 9, these used
to attach in the USB address order.  On 10, the uplcoms all attach
first, in address order, and the uftdi afterwards, so the corresponding
devices cuaU[0-3] have been reordered.

I just thought I'd mention it.

-- 
Christian "naddy" Weisgerber                          naddy@mips.inka.de