Date: 14 Apr 2001 11:30:59 +0200 From: Matthias Andree <ma@dt.e-technik.uni-dortmund.de> To: freebsd-stable@freebsd.org Subject: FreeBSD 4.x refuses to use DMA on WDC31200F? Message-ID: <m3ae5jakvg.fsf@emma1.emma.line.org>
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Hi, I recently noticed that FreeBSD 4.x (4.0-RELEASE, 4.2-RELEASE, 4.2-STABLE, currently 4.3-RC) refuses to use DMA to transfer data to/from my Western Digital Caviar AC31200F. This drive is able to do DMA1 or PIO3, for a reason I cannot see and that is neither mentioned in ata(4) or in syslog, even sysctl -w hd.atamodes=dma,---,---,---, does not change FreeBSD's mind. A WDCAC420400D is used in DMA mode (UDMA/33). My system is boots and mounts /, /usr and /var from a SCSI disk attached to a Tekram DC-390 (AMD PCscsiII/53C974). That very same drive can be successfully used in DMA mode with NetBSD 1.5 (same machine) and Linux 2.2.19 (same board type/chipset), I've never seen corruption on that drive with DMA. The drive is attached to a VIA VT82C586B (Apollo MVP3) on a Tyan Trinity 100AT (S1590). What causes FreeBSD's refusal to use DMA? Can I fix that? Can somebody else fix that? -- Matthias Andree To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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