duh! just read the whole thread...
[...]
Christof could always resort to petitioning Apple to release the specs, or
digging though Darwin source code to discover the secret.
the chip specs are freely available:
http://www.micronas.com/documentation/data_sheet/dac3550a_1ds.pdf
Ben H might know something about driving the iBook i2c busses - I think that
they are the new Apple "cereal" style which are also present on the PCI host
bridges... but not quite sure.
Iain.
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