From owner-freebsd-questions Sun Mar 25 2:48:47 2001 Delivered-To: freebsd-questions@freebsd.org Received: from anchor-post-34.mail.demon.net (anchor-post-34.mail.demon.net [194.217.242.92]) by hub.freebsd.org (Postfix) with ESMTP id B258537B718 for ; Sun, 25 Mar 2001 02:48:44 -0800 (PST) (envelope-from tim@weeble.org.uk) Received: from josep.demon.co.uk ([194.222.61.233] helo=doubtful.weeble.foo.uk) by anchor-post-34.mail.demon.net with esmtp (Exim 2.12 #1) id 14h84h-000G5e-0Y for freebsd-questions@freebsd.org; Sun, 25 Mar 2001 11:48:43 +0100 Received: from localhost (tim@localhost) by doubtful.weeble.foo.uk (8.11.3/8.11.1) with ESMTP id f2PAmgV69330 for ; Sun, 25 Mar 2001 11:48:42 +0100 (BST) (envelope-from tim@weeble.org.uk) Date: Sun, 25 Mar 2001 11:48:42 +0100 (BST) From: Tim Joseph X-X-Sender: To: Subject: U/DMA on FSBD 4.x Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Hi, I've had some bad experiences with DMA and UDMA/33 under Linux (2.2.x kernels). In the best case the controller reset and switched off DMA, in the worst I've had my whole hardrive hosed. Does anyone have any experience on the relative maturity of the DMA code in FBSD 4.x-stable versus what was in Linux (which to be, fair was advertised as experiental). How do I go about enabling DMA or UDMA on my box? Is U/DMA "safe" under FBSD? Are there any particular chipset/harddrive combos to watch out for? I'm running a K6-2/350MHz, 256MB PC100 SDRAM, MS-5169 (ATX AL9) mobo, Aladdin 5 M1531/M1543 chipset, IBM Deskstar IDE (UDMA/33) HDD. My dmesg has rotated so I can't show you the kernel boot messages at the mo, but I can reboot and dig it up if needed. Thanks. From, Tim To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message