There might be a solution...
First, if the mobo reads the CPU diode, then you have to bypass that reader. Since none of us want to start cutting traces on our mobos, we're left with one option:
cut off the cpu pins for the diode, and attach wires to those two pins.
THEN one could build pHaestus' reader.
As for the calibration, the neat thing about this diode is that it'll work even if the CPU is not powered, so if you're able to stabilize its temp (bad example: dunk it in water), and take an accurate temp measurement, that'll be your calibration.
Some notes:
a) you should take this calibration measurement at different temperatures, because the diode's response curve may not be linear.
b) the accuracy of your calibration is going to depend (a lot) on the accuracy of what you use as a reference, to measure the temp.
It is *theoretically* possible to build a reader with +/- 0.1 deg C accuracy (PM me for details), but the CPU diode may not have this accuracy.
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