From owner-freebsd-sparc64@FreeBSD.ORG Fri Jan 20 20:00:31 2012 Return-Path: Delivered-To: freebsd-sparc64@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 141D3106564A for ; Fri, 20 Jan 2012 20:00:31 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id D39BF8FC12 for ; Fri, 20 Jan 2012 20:00:30 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.5/8.14.5) with ESMTP id q0KK0UuL047157 for ; Fri, 20 Jan 2012 20:00:30 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.5/8.14.5/Submit) id q0KK0Ubd047155; Fri, 20 Jan 2012 20:00:30 GMT (envelope-from gnats) Date: Fri, 20 Jan 2012 20:00:30 GMT Message-Id: <201201202000.q0KK0Ubd047155@freefall.freebsd.org> To: freebsd-sparc64@FreeBSD.org From: Marius Strobl Cc: Subject: Re: sparc64/164226: Data corruption on 9.0-RELEASE when reading from CDROM X-BeenThere: freebsd-sparc64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Marius Strobl List-Id: Porting FreeBSD to the Sparc List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jan 2012 20:00:31 -0000 The following reply was made to PR sparc64/164226; it has been noted by GNATS. From: Marius Strobl To: Alexander Motin Cc: freebsd-gnats-submit@FreeBSD.org, "C. P. Ghost" Subject: Re: sparc64/164226: Data corruption on 9.0-RELEASE when reading from CDROM Date: Fri, 20 Jan 2012 20:50:05 +0100 On Fri, Jan 20, 2012 at 09:40:35PM +0200, Alexander Motin wrote: > On 01/20/12 21:32, Marius Strobl wrote: > >On Fri, Jan 20, 2012 at 08:13:38PM +0200, Alexander Motin wrote: > >>On 20.01.2012 19:51, Marius Strobl wrote: > >>>Alexander, could you please look into this? > >>>Apparently, using cd(4) with ATA_CAM on sparc64 causes seemingly > >>>random data corruption while using the same hardware with acd(4) > >>>doesn't. Also cd(4) works just fine with SPI CD-ROMs. This affects > >>>CD-ROMs connected to both AcerLabs M5229 and CMD 646. > >>>Btw., apparently hw.ata.ata_dma and w.ata.atapi_dma no longer > >>>work when using ATA_CAM as ata_getparam() isn't called in the > >>>first place. On a quick glance hw.ata.ata_dma_check_80pin and > >>>hw.ata.wc probably also are no longer available with ATA_CAM. > >>>Is there an alternative to these tunables to achieve the same > >>>when using ATA_CAM? > >> > >>hw.ata.ata_dma and hw.ata.atapi_dma are indeed no longer exist. But > >>hint.ata.X.mode and hint.ata.X.devX.mode are working. In run tame it can > >>be done via `camcontrol negotiate cd0 -U -M mode; camcontrol rescan X`, > >>where X is a CAM bus number. > >> > >>hw.ata.ata_dma_check_80pin still exist, but CAM ATA transport is no > >>longer look on whet device thinks about cable type. It is tricky in SATA > >>world. Cable type is checked only from controller driver side now. Looks > >>like none of mentioned controller drivers are doing it. > >> > >>hw.ata.wc was replaced by kern.cam.ada.write_cache and > >>kern.cam.ada.X.write_cache. > >> > >>I would start experiments from limiting transfer speed manually. > > > >Hrm, limitting the mode to PIO avoids the data corruption with > >ATA_CAM. > > What's about limiting speed to UDMA33? Is it DMA problem or result of > dropped device side cable detection that could limit to UDMA33 before? > Apparently it's some sort of DMA problem. UDMA2 is also the maximum negotiated with acd(4). Limitting to UDMA1, UDMA0 or even WDMA0 makes no differnce to the problem. Marius