Most modern motherboards use a 1/2, 1/3 or 1/4 divider on the memory bus
(set in BIOS) to get PCI values. idebus= is used for anything other
than 33MHz:
Mem PCI divider idebus=
66 33 1/2 default
75 37.5 1/2 38
85 42.5 1/2 43
100 33 1/3 default
133 33 1/4 default
For example, setting the bus at 75MHz would mean 'idebus=38' on the boot
command line or in lilo to prevent timing problems which could lead to
disk data corruption. Most PCI bus related data corruption occured when
driving the bus more than 15% over spec.
rgds,
tim.
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