From owner-freebsd-arm@freebsd.org  Wed May 11 06:47:23 2016
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Subject: Re: ehci_disown - Olimex ARM A20 Lime & USB FTDI RS-485 shuts down
 USB port
To: Neal Horman <neal@wanlink.com>, freebsd-usb@freebsd.org,
 freebsd-arm@freebsd.org
References: <57325AB8.9010108@wanlink.com>
From: Hans Petter Selasky <hps@selasky.org>
Message-ID: <efe4323f-fe6e-1b8a-a5d5-4779b95a4578@selasky.org>
Date: Wed, 11 May 2016 08:50:36 +0200
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Hi,

ehci_disown() means that there should be a full speed controller that 
should handle the device, because it is not high-speed. Does your board 
have OHCI/UHCI or only EHCI? How are the USB parts wired. Is there a 
High-Speed TT (USB HUB chip) connected to the EHCI port?

Can you compare dmesg from Linux and FreeBSD and look for the USB parts.

--HPS