Date: Fri, 7 Sep 2001 14:15:19 +0000 From: "Elfar Aðalsteinn Ingvarsson" <elfar@landspitali.is> To: "Ruben de Groot" <RGROOT@dto.tudelft.nl>, freebsd-questions@freebsd.org Subject: Re: UDMA question Message-ID: <OF49F11998.00C22EC0-ON00256AC0.004DDEC2@landspitali.is>
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try setting
sysctl hw.ata.atapi_dma=1
but the hard drive will propably still go to UDMA33
because the slowest drive that sets the speed for the
rest of the drives.
____________________________________________________
Elfar Aðalsteinn Ingvarsson
Vettvangsþjónusta Tölvudeildar
"Ruben de Groot"
<RGROOT@dto.tudelft.nl To: freebsd-questions@FreeBSD.ORG
> cc:
Sent by: Subject: Re: UDMA question
owner-freebsd-question
s@FreeBSD.ORG
07.09.2001 13:52
"Neil Darlow" <neil@darlow.co.UK> wrote:
> /dev/ad0 - UDMA/66 drive
> /dev/ad2 - UDMA/66 drive
> /dev/acd0 - UDMA/33 cdrom
>
> The cdrom drive is slave to /dev/ad0 and bios says it's in PIO4.
>
> The system runs fine but /dev/ad0 drops to UDMA/33 operation which I
> assume is caused by the presence of the cdrom.
>
> Is there any way I can restore UDMA/66 operation to /dev/ad0 with the
> setting of driver flags etc?
>
> Please don't say remove the cdrom and, yes, UDMA/66 cables are used
> for both drive chains.
I'm going to say it anyway: remove the cdrom.
You can't have UDMA/66 and UDMA/33 on the same cable at the same time.
Sorrie
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