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Date:      Sat, 26 Nov 2016 08:57:23 +0100
From:      Hans Petter Selasky <hps@selasky.org>
To:        lev@FreeBSD.org, freebsd-hardware@freebsd.org, freebsd-usb@freebsd.org
Subject:   Re: Is here any work on USB Attached SCSI (UAS/UASP) support?
Message-ID:  <c965ebf7-b475-b38e-a186-bfb4a630a0cf@selasky.org>
In-Reply-To: <96c9e5ed-f35e-d9d1-16ba-b967bec3bdf4@FreeBSD.org>
References:  <561b3e61-0df2-0eba-24d9-7edf07a7c0ea@FreeBSD.org> <ddabe5f5-23a9-0fda-f732-bcc7b66e774b@selasky.org> <96c9e5ed-f35e-d9d1-16ba-b967bec3bdf4@FreeBSD.org>

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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



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