Date: Fri, 17 Dec 1999 20:14:56 +0100 (CET) From: Soren Schmidt <sos@freebsd.dk> To: veldy@visi.com (Thomas Veldhouse) Cc: freebsd-current@FreeBSD.ORG (FreeBSD-Current) Subject: Re: ATA Problem? Fallback to PIO Message-ID: <199912171914.UAA74875@freebsd.dk> In-Reply-To: <Pine.GSO.4.10.9912170818480.342-100000@isis.visi.com> from Thomas Veldhouse at "Dec 17, 1999 08:30:22 am"
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It seems Thomas Veldhouse wrote: >> Hmm, the WDC WD200BA disk does UDMA66 doesn't it ?? >> The VIA 82C686 has support for this, but its very "generous" in setting >> it. Form the above I'd guess you dont have a 80lead cable on those >> disks ?? What does the BIOS say about the disk modes on boot ?? >> A dmesg from a verbose boot would be nice... Also what mobo is this ? >> I guess the VIA has decided to run UDMA66 which wont work without >> the right cable... >> >This is a compaq special motherboard (5868 series). If I would have known >what I as getting, I wouldn't have bought the computer. The BIOS offers >nearly nothing in the way of options. I do know it uses a VIA chipset and >the AMD 751 chipset. I don't really have more specifics other than what >you see in the dmesg. I will get you a verbose dmesg tonight. I will also >see what BIOS settings are available. I do believe all of them are set to >auto for the IDE interfaces. Hmm, never buy "brand name" PC's, better get two clones for the same price :), however the chipset combo are the same as on m K7M, the secret ASUS board... >I do believe the drive is UDMA66 capable - but I never looked into it. >Perhaps I should get a different cable. Ironically, Linux drops that >drive to PIO. Well, last I looked Linux didn't have any real support for the VIA 82c686, maybe its because VIA doesn't have a spec sheet for it online. I've done some experimentation, and have some sparse docs, but its not perfect (neither are the VIA chips I might add).... >> Because ATAPI DMA is disabled as default (the old driver didn't even have >> DMA support for ATAPI devices), see lint how to enable it. >Cool. Real CD performance. Yup, I get around 4M/sec of my drive with no CPU load, real nice... But be carefull, alot of ATAPI devices dont take DMA that well, and some chipsets are real crappy in that respect too.... -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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