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Re: getting dma66 support in kernel

Hey that got it to work for me!!  I have had problems following other how-to's.  
Well, the HD speed went from 3 MB to 22 MB.  
This is still a long way from 66.  Is this normal? (I here 66 is almost
I have a motherboard and a hd that support ata 66 so I'm not sure what the
differences are compared to having a seperate controller.


On Sun, 20 Aug 2000 11:40:36 +0200, Philipp Schulte said:

> On Sun, Aug 20, 2000 at 12:02:33AM -0400, Dave Bresson wrote:
>  > so i used to be running the 2.2.17-ide kernel which came with potato, but
>  > have since took it upon myself to go with a homegrown kernel, one which i
>  > have configured and compiled myself.  I downloaded the source to 2.2.16
>  > and patched it to the latest 2.2.17pre19.  I configured, and compiled it
>  > using make-kpkg and installed it.  However, to my dismay, when i compiled
>  > it i saw no real option for the dma66 support which i need (and yes, i did
>  > select to show the optional selections in make menuconfig) and so my newly
>  > compiled kernel does nothing for my dma66 controller on my motherboard.
>  There is an option called "Use DMA by default if available" in the
>  Section "General Setup" close to the chipset stuff.
>  But there may be many reasons why UDMA-66 is not turned on:
>  1. cables
>  Do you use proper 66-cables, and did you make sure they are not too
>  long?
>  2. some other device on the same controller interferes with the HD
>  3. HD and controller are not 100% compatible
>  I would recommend to do the following:
>  Try to turn on UDMA by using the programm "hdparm"
>  hdparm -d1 /dev/hd?
>  If you can turn in on this way you can set the mode by using these
>  options:
>  -X66 for UDMA-33 (!)
>  -X68 for UDMA-66
>  If it is possible to switch to UDMA-66 this way but the HD won't do it
>  by itself you can put this line in /etc/init.d/bootmisc.sh
>  hdparm -d1 -X68 /dev/hd?
>  HTH
>  Phil
>  -- 
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