From owner-freebsd-questions  Fri Sep  7  7:15:50 2001
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Subject: Re: UDMA question
To: "Ruben de Groot" <RGROOT@dto.tudelft.nl>,
	freebsd-questions@freebsd.org
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From: "Elfar Aðalsteinn Ingvarsson" <elfar@landspitali.is>
Date: Fri, 7 Sep 2001 14:15:19 +0000
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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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