From owner-freebsd-hardware@freebsd.org  Sat Nov 26 07:57:42 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
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From: Hans Petter Selasky <hps@selasky.org>
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Date: Sat, 26 Nov 2016 08:57:23 +0100
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On 11/25/16 21:30, Lev Serebryakov wrote:
>   Intel's ones? ASMedia's ones? Anyway, UASP is new protocol, but it is
> SCSI at its core, so sit should be new transport layer for CAM?

Yes, UASP is using SCSI. I think INTELs XHCIs support it, but others may 
not. The whole concept about USB streams has been controversial in USB 
circles and is disabled in FreeBSD by default, because it has not been 
tested properly yet due to lack of hardware.

sysctl hw.usb.xhci.streams=1

--HPS