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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-current@freebsd.org,
 Pegasus Mc Cleaft <ken@mthelicon.com>
Date: Tue, 23 Dec 2008 11:03:26 +0100
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Subject: Re: HEADSUP usb2 (usb4bsd) to become default in 2 weeks.
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On Tuesday 23 December 2008, Pegasus Mc Cleaft wrote:
> I believe that the Prolific USB serial adapter is broken on AMD64.  I tried
> one of the adapters on my machine and no matter what serial speed I was
> selecting with cu it would come back with an error stating the speed was
> unsupported. I moved the adapter to a 8-current machine (i386) with the
> usb1 stack and everything worked fine.
>
> Peg

Are you sure that this is not an mpsafetty problem?

Also, try to turn on debugging (I386+AMD):

sysctl hw.usb2.uftdi.debug=15

What happens with USB2+I386+UFTDI?

--HPS