Andi Kleen wrote:
My machine in question, for example, needs no waiting within CMOS_READs
at all. And I doubt any other chip/device needs waiting that isn't
I don't know about CMOS, but there were definitely some not too ancient
systems (let's say not more than 10 years) who required IO delays in the
floppy driver and the 8253/8259. But on those the jumps are already
far too fast.
Yes, early Linux used jumps. I believe it broke a bunch of machines
when the P5 came out, as the jumps were too fast. (I have to admit to
being a bit fuzzy on this... my memory says it was the 486 and not the
P5, but that clearly can't be the case since my first Linux box was a
486/33.)
-hpa
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