Re: [preview] VIA IDE 4.0 and AMD IDE 2.0 with automatic PCI clock detection

From: Vojtech Pavlik (vojtech@suse.cz)
Date: Sat Feb 10 2001 - 04:11:08 EST

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    On Fri, Feb 09, 2001 at 04:42:52PM -0600, Philip Langdale wrote:
    >
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    > Vojtech,
    >
    > I've tried out your new via driver and it
    > appears to have solved the problem with
    > the mis-detected ls-120 drive, but the ata66
    > drives are still being run at 33.
    >
    > More interestingly, the pci-clk calculations
    > seem to be returning badly off values.
    >
    > My motherboard is a kt133a+686b btk7a from abit.
    >
    > When I set the FSB to 133 with PCI=133/4=33 the
    > timing code returns 43mhz.
    >
    > when I set the FSB to 100 with PCI=100/3=33 then
    > it returns 42mhz.
    >
    > These are scarely different from the nominal values.
    > I didn't observe anything bad in the few minutes
    > I was running like this, but right now I've hacked
    > the driver back to a hardcoded 33.
    >
    > What should I do next?

    Are you willing to do some experiments? I suppose the 686b is somewhat
    different than the other chips (I tested it on 686a and 586b). 

    -- 
Vojtech Pavlik
SuSE Labs
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