Date: Sun, 13 Sep 2009 16:45:13 PDT From: Dieter <freebsd@sopwith.solgatos.com> To: gavin@FreeBSD.org Cc: bug-followup@freebsd.org, freebsd-usb@FreeBSD.org Subject: Re: usb/113977: [request] Need a way to set mode of USB disk's write cache Message-ID: <200909132345.XAA21847@sopwith.solgatos.com> In-Reply-To: Your message of "Mon, 31 Aug 2009 12:14:11 GMT." <200908311214.n7VCEBJ2046645@freefall.freebsd.org>
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In message <200908311214.n7VCEBJ2046645@freefall.freebsd.org>, gavin@FreeBSD.org writes: > Synopsis: [request] Need a way to set mode of USB disk's write cache > > State-Changed-From-To: suspended->feedback > State-Changed-By: gavin > State-Changed-When: Mon Aug 31 12:07:21 UTC 2009 > State-Changed-Why: > To submitter: Sorry that this PR has not been looked at since > submission. If your external device supports changing write > cache, I think it should be visible with "camcontrol modepage da0 -m 8". > If that doesn't work, I don't know if there is any way you can > achieve what you want to do. > > > Responsible-Changed-From-To: freebsd-usb->gavin > Responsible-Changed-By: gavin > Responsible-Changed-When: Mon Aug 31 12:07:21 UTC 2009 > Responsible-Changed-Why: > Track > > http://www.freebsd.org/cgi/query-pr.cgi?pr=113977 With: umass0: <Prolific Technology Inc. ATAPI-6 Bridge Controller, class 0/0, rev 2.00/0.01, addr 2> on uhub4 # camcontrol modepage da0 -l 0x2f # camcontrol modepage da0 -m 8 IC: 0 ABPF: 0 CAP: 0 DISC: 0 SIZE: 0 WCE: 0 MF: 0 RCD: 0 Demand Retention Priority: 0 Write Retention Priority: 0 Disable Pre-fetch Transfer Length: 0 Minimum Pre-fetch: 0 Maximum Pre-fetch: 0 Maximum Pre-fetch Ceiling: 0 # camcontrol modepage da0 -m 0x8 -e camcontrol: no editable entries With: umass0: <JMicron USB to ATA/ATAPI Bridge, class 0/0, rev 2.00/1.00, addr 2> on uhub1 # camcontrol modepage da0 -l gives no response (just a new shell prompt) # camcontrol modepage da0 -m 0x8 camcontrol: error sending mode sense command I tried several other values for -m with the same results.
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