From owner-freebsd-hardware@freebsd.org  Fri Nov 25 14:57:55 2016
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Subject: Re: Is here any work on USB Attached SCSI (UAS/UASP) support?
To: lev@FreeBSD.org, freebsd-hardware@freebsd.org, freebsd-usb@freebsd.org
References: <561b3e61-0df2-0eba-24d9-7edf07a7c0ea@FreeBSD.org>
From: Hans Petter Selasky <hps@selasky.org>
Message-ID: <ddabe5f5-23a9-0fda-f732-bcc7b66e774b@selasky.org>
Date: Fri, 25 Nov 2016 15:57:34 +0100
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On 11/25/16 14:46, Lev Serebryakov wrote:
>
>  $subj. Don't mix it with UMASS, which is, obviously, supported for many
> years. I've tried to find mentions of UASP in sources (CURRENT) and find
> nothing, but maybe it is well-hidden?
>
>  I'm asking because now I see very interesting products on market, like
> 5xHDD hot-swap enclosure for only $150, which uses UASP to attach to
> host computer. It could be nice addition to FreeBSD-based storage servers.
>

Hi,

For Super Speed (USB 3.0) UASP uses streams mode instead of regular bulk 
transfers from what I can see, which is not supported by all XHCI 
controllers.

In USB 2.0 mode it will work using BULK only. Not sure if the vendors 
provide BULK only configurations for USB 3.0.

--HPS