Date: Tue, 27 Oct 1998 20:01:32 -0500 From: Lee Cremeans <lee@st-lcremean.tidalwave.net> To: hackers@FreeBSD.ORG Cc: current@FreeBSD.ORG Subject: Call for help on UDMA on Acer chipsets... Message-ID: <19981027200132.A977@tidalwave.net>
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I just got myself a shiny new Seagate Medalist Pro 9140 9GB UDMA drive yesterday, and I noticed as I was setting it up last night, that if I enabled DMA on it, it got the dreaded interrupt timeout spasms people have seen. I think I know why...my motherboard, an Amptron 9600, uses an Acer chipset, which isn't explicitly covered in ide_pci.c...so I've had to do what all those others have had to do, and turn off _all_ IDE DMA support on this drive. :( The purpose of this message is to get some help in fixing this--I can be helpful myself, with coding, testing, etc, but I need someone who has an Acer Aladdin IV+ or Aladdin V chipset, runs 3.0-CURRENT, and can get access to the Acer M1543 data sheet (which is available on the web at acerlabs.com, but it's behind a Username/Password box and I don't know how to register). I think it's a real shame to have to run my drive in PIO mode just because of this. Also, a workaround I can think of for other non-supported chipsets (like SiS) would be to put the drive in Multiword DMA mode 2 instead of UDMA--but I'm not sure if this is possible without stepping on any timing toes, I'll see. -- Lee Cremeans -- Manassas, VA, USA (WakkyMouse on DALnet and WTnet) A! JW223 YWD+++^ri P&B++ SL+++^i GDF B&M KK--i MD+++i P++ I++++ Did $++ E5/10/70/3c/73ac/95/96 H2 PonPippi Ay77 M | mailto:lcremean@tidalwave.net http://st-lcremean.tidalwave.net | Powered by FreeBSD 3.0-CURRENT To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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