Date: Mon, 15 Aug 2005 20:33:08 -0400 From: jason <jason@ec.rr.com> To: Mark Kane <mark@mkproductions.org> Cc: freebsd-questions@freebsd.org Subject: Re: How to Force UDMA100 Mode on Boot? Message-ID: <43013444.8080808@ec.rr.com> In-Reply-To: <430128F1.9@mkproductions.org> References: <430128F1.9@mkproductions.org>
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Mark Kane wrote: > Hi everyone. I've had a thread going here on the lists about DMA > problems in 133 mode. In a nutshell, some drives give DMA_WRITE and > DMA_READ errors when in 133 mode with certain configurations, however > don't have any problems in 100 or 66 mode. After looking in to many > solutions I think I'm just going to run it at 100, since from my > research the benefit isn't that noticeable. > > I know about atacontrol to set it manually, but I'd like to set > UDMA100 mode automatically on boot since I have 5 hard drives. I also > know the sysctl hw.ata.ata_dma, but that doesn't say anything about > using 100 vs 133. > > Thanks in advance. > > -Mark > Sounds like a cable issue, but could it be a buggy bios? How about some information since I did not see your previous postings. > dmesg|grep DMA atapci1: <nVidia nForce2 UDMA133 controller> port 0xf000-0xf00f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 9.0 on pci0 ad0: 38172MB <MAXTOR 6L040J2/A93.0500> [77557/16/63] at ata0-master UDMA133 Also if I don't have a cd in the drive I get "acd0: CDRW <LITE-ON LTR-40125S/ZS0K> at ata1-master PIO4" for acd0. If there is a disc in the drive it is set to UDMA66 at boot up. Or first use if it was not in at boot.
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