From owner-freebsd-hackers@freebsd.org Thu Jan 28 16:34:43 2016 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2F777A714B4 for ; Thu, 28 Jan 2016 16:34:43 +0000 (UTC) (envelope-from nkoch@demig.de) Received: from demig.de (demig.de [81.169.228.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "Parallels Panel", Issuer "Parallels Panel" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 923821AA5 for ; Thu, 28 Jan 2016 16:34:42 +0000 (UTC) (envelope-from nkoch@demig.de) Received: (qmail 27742 invoked from network); 28 Jan 2016 17:33:39 +0100 Received: from b2b-130-180-89-86.unitymedia.biz (HELO firewall.demig.intra) (130.180.89.86) by demig.de with ESMTPSA (DHE-RSA-AES256-SHA encrypted, authenticated); 28 Jan 2016 17:33:38 +0100 Received: from SRV-FS-2.Demig.intra (nameserver.demig.intra [192.168.148.248]) by firewall.demig.intra (8.14.4/8.14.4) with ESMTP id u0SGXPC1032066 for ; Thu, 28 Jan 2016 17:33:25 +0100 (CET) (envelope-from nkoch@demig.de) Received: from [192.168.148.83] (192.168.148.83) by SRV-FS-2 (192.168.148.248) with Microsoft SMTP Server (TLS) id 14.3.123.3; Thu, 28 Jan 2016 17:33:20 +0100 Subject: Re: impossible to set pata dma mode? To: References: <56A9D502.7010809@demig.de> <1453995911.1275.14.camel@freebsd.org> From: Norbert Koch X-Enigmail-Draft-Status: N1110 Message-ID: <56AA42CF.10408@demig.de> Date: Thu, 28 Jan 2016 17:33:19 +0100 User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <1453995911.1275.14.camel@freebsd.org> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.73 on 192.168.148.235 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Jan 2016 16:34:43 -0000 Am 28.01.2016 um 16:45 schrieb Ian Lepore: Thanks Ian, I know that I can configure this using boot hints. I am having a rather special situation where I need to change these settings after boot. It has to do with pxe booting different FreeBSD versions using an outdated grub which only allows to directly load a kernel without specifying boot parameters. Obviously I can help myself with a modified camcontrol. But I am still curious what the reason for the limitation might be. > On Thu, 2016-01-28 at 09:44 +0100, Norbert Koch wrote: >> Hello. >> >> I have to reduce dma mode from udma to wdma2 >> for a flash device. >> >> In the past this was easy using atacontrol >> but, afaiks it seems to be impossible using camcontrol. >> >> camcontrol negotiate ada0 -M wdma >> ...You can only modify user parameters >> >> camcontrol negotiate ada0 -NM wdma >> Works, but I see no way how those user >> parameters become active parameters as the >> driver only reads then in attach as far as >> I can see. >> >> It seems like the ata driver's interface >> allows to change the current settings >> (XPT_SET_TRAN_SETTINGS/CTS_TYPE_CURRENT_SETTINGS) >> so, why is camcontrol so restrictive? >> >> Thank you, >> Norbert Koch > I don't know about changing it on the fly with camcontrol (I've never > done that), but you can configure it at boot time with a tunable in > loader.conf of the form > > dev.ada.0.mode="modestr" > > Where modestr is one of these (from dev/ata/ata-all.c): > > if (!strcasecmp(str, "PIO0")) return (ATA_PIO0); > if (!strcasecmp(str, "PIO1")) return (ATA_PIO1); > if (!strcasecmp(str, "PIO2")) return (ATA_PIO2); > if (!strcasecmp(str, "PIO3")) return (ATA_PIO3); > if (!strcasecmp(str, "PIO4")) return (ATA_PIO4); > if (!strcasecmp(str, "WDMA0")) return (ATA_WDMA0); > if (!strcasecmp(str, "WDMA1")) return (ATA_WDMA1); > if (!strcasecmp(str, "WDMA2")) return (ATA_WDMA2); > if (!strcasecmp(str, "UDMA0")) return (ATA_UDMA0); > if (!strcasecmp(str, "UDMA16")) return (ATA_UDMA0); > if (!strcasecmp(str, "UDMA1")) return (ATA_UDMA1); > if (!strcasecmp(str, "UDMA25")) return (ATA_UDMA1); > if (!strcasecmp(str, "UDMA2")) return (ATA_UDMA2); > if (!strcasecmp(str, "UDMA33")) return (ATA_UDMA2); > if (!strcasecmp(str, "UDMA3")) return (ATA_UDMA3); > if (!strcasecmp(str, "UDMA44")) return (ATA_UDMA3); > if (!strcasecmp(str, "UDMA4")) return (ATA_UDMA4); > if (!strcasecmp(str, "UDMA66")) return (ATA_UDMA4); > if (!strcasecmp(str, "UDMA5")) return (ATA_UDMA5); > if (!strcasecmp(str, "UDMA100")) return (ATA_UDMA5); > if (!strcasecmp(str, "UDMA6")) return (ATA_UDMA6); > if (!strcasecmp(str, "UDMA133")) return (ATA_UDMA6); > > -- Ian -- Dipl.-Ing. Norbert Koch Entwicklung Prozessregler