MacOS 9 vs. linux IDE

Benjamin Herrenschmidt bh40 at
Sat Sep 25 02:01:36 EST 1999

I've done some experiments with MacOS 9. Apparently, the IDE controller
is in a strange state after MacOS shutdown, and this is not related to
the feature control bits of the mac-io. However, I managed to revive it
after writing various values in the IDE control register (+0x160).

It looks like Apple uses bits in the MSB quartet of the IDE control
register, which are, to my knowledge, not defined by the standard.

Someone has an idea about this ? I'll continue my tests until I find
something that works all the time.

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