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Re: Booting the Debian installation CD on Powerbook G4 12"

Benjamin Herrenschmidt wrote:

If you're going to reimplement the delays using the
time base, why not use the KeyLargo timer instead?
It runs at the same frequency (18.432MHz) on all
machines, so that'll save a multiply ;)  Too bad for
the non-Macs, but else you'll have to special-case
the 601 (and maybe others) anyway.

I don't want to rely on external HW,

Why not?

> IOs are slow,

Duh...  this is the delay loop we're talking about!

> KL doesn't exist on all macs,

Not interesting ;)

> and other PPCs would benefit from TB based delays as well

That's a very good reason though.

KL timer would be useful for better calibration of TB during boot
on pmacs though (Darwin recent versions use it for that as well).

I know (you told me :) )


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