From owner-freebsd-usb@FreeBSD.ORG  Mon Jan 31 07:36:43 2011
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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org
Date: Mon, 31 Jan 2011 08:36:43 +0100
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Subject: Re: FTDI Com ports "just stop"
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On Sunday 30 January 2011 19:57:07 Karl Pielorz wrote:
> Any hints how I can try and debug this? I think it might be related to the 
> 2nd set of 4 FTDI ports, as I didn't notice this issue for the few weeks 
> the system ran with just 4 ports connected.

Try connecting a null-modem cable and see if you can loop any data.

Also you can try a "usbconfig -d X.Y reset"

--HPS