trini at kernel.crashing.org
Mon Oct 22 12:56:58 EST 2001
On Sun, Oct 21, 2001 at 03:42:11PM -0700, Dave Ray wrote:
> It's my understanding the Mac G4 towers run at a bus
> speed of 133 MHz. However the kernel argument for
> idebus=xx apparently only allows values up to 66. Is
> this intentional?
idebus != 'bus'. The 133 referrs to the speed the memory and cpu can
talk at. Your idebus setting shouldn't change from the default.
"idebus=xx" : inform IDE driver of VESA/PCI bus speed in MHz,
where "xx" is between 20 and 66 inclusive,
used when tuning chipset PIO modes.
For PCI bus, 25 is correct for a P75 system,
30 is correct for P90,P120,P180 systems,
and 33 is used for P100,P133,P166 systems.
If in doubt, use idebus=33 for PCI.
As for VLB, it is safest to not specify it.
Bigger values are safer than smaller ones.
Tom Rini (TR1265)
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