...just a partial update, I've changed the way the servo loop's runtime values are printed - namely the ppb frequency correction value, as returned by servo_sample() in a double float type. If I have it printed with 20 decimal places after the dot, I can see that it quickly converges to some residuals below 10^-12 ppb. Probably meaning a bedrock 0 in the i210 config registers.
Next, I removed the initial preload of the PHC's from the (imprecise) system wall clock. Made it optional, can be suppressed via a cmdline argument. And, after that, I can see that there really is no skew if I leave the PHC's undisciplined for a while. (I just stop my proggie, wait a while, and start it again.) Now where do I go from here... :-D Frank
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