Re: idebus? [was: Re: Homebrewed kernel]

[Chris Kloiber <ckloiber redhat com>]

On Thu, 1 Mar 2001, Ryan wrote:

> On Wed, 28 Feb 2001, Dominik Mierzejewski wrote:
>
> > John Summerfield wrote:
> > [snip]
> > > I have this:
> > > default=new
> > > root=/dev/hda1
> > >
> > > image=/boot/vmlinuz
> > >         label=new
> > >         VGA=0x316
> > >         append="ide0=ata66 idebus=66 parport=0x378,7 apm=off"
> >                              ^^^^^^^^^
> > Hm... I always thought idebus was supposed to be equal to PCI clock.
> > Do you have 66MHz PCI clock?
>
> I use this idebus=66 line also because the kernel(?) tells you to do so
> during bootup.  With the new 2.4 kernel it started mentioning idebus speed
> and assumes 33Mhz, at least on my system, so I force it to use the ATA66
> using that boot parameter.  I'm not saying I know anything special, just
> going by the message displayed on bootup if this boot parameter is not
> used on my hardware.  I'm sure John experienced the same.
>
> I added the ide0=ata66 line after reading John's message, but I don't
> think that did anything different for me.
>
> Ryan

I think you should grep through the kernel docs, I believe John S. is
correct. The only reason to specify idebus= is if you overclock your
motherboard, thus raising the PCI clock speed.

Chris Kloiber