From owner-freebsd-hackers@freebsd.org  Fri Nov 24 08:14:34 2017
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Subject: Re: Is ddb(4) over a USB-to-Serial port possible?
To: Oliver Pinter <oliver.pinter@hardenedbsd.org>
Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>,
 Farhan Khan <khanzf@gmail.com>
References: <11ce9826-f768-3ea0-547d-2d182d1552f0@gmail.com>
 <36165883-5cb7-aabc-c81e-cb5458029803@freebsd.org>
 <5c6da274-102c-33c6-50f0-20597cf8e7ef@selasky.org>
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 <CAPQ4ffuvUtSwoFRrLdEZ5e63nhovhR9rnqrZ-=L1RT1d_9k=YA@mail.gmail.com>
From: Hans Petter Selasky <hps@selasky.org>
Message-ID: <953998da-5e3a-1f3c-b56b-41ddda020b68@selasky.org>
Date: Fri, 24 Nov 2017 09:11:46 +0100
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On 11/23/17 23:34, Oliver Pinter wrote:
> Could we somehow change these after attached device?  Ergo could we setup
> two USB context, one for normal operation and one for the debugger?

What you can do is to set the values, then re-enumerate the USB device 
like this:

usbconfig -d X.Y reset

--HPS