Yes. "Seven general purpose 1.8 V I/Os, with two of them supporting up to 3.3 V"
Perhaps that is not referring to the Edison GPIO but no matter what, I still am looking for what the Edison GPIO input looks like. Specifically, what do I need to do to drive the input from a 3.3V source? Maybe I can use a voltage divider or just a series resistor, or maybe not. The point is, I need an electrical specification for the input to know what I am driving and I can't find it.
You can take a look at Table 27 and Table 28 of the Edison Module Hardware Guide to check the specifications of the GPIO pins. Regarding the two GPIO pins that support 3.3V, these belong to the PMIC, and the only visible pin of the PMIC is Vsys so this is not an option.
For suggestions on how to translate the 3.3V to 1.8V I would suggest you to check the following threads were this is discussed.
Thanks. The newer January 2-15 HG has just what I wanted.
In terms of level shifting, I have been using the Sparkfun or Adafruit bidirectional ones and while they work fine, I was looking for something simple for the case where I only needed to drop a single pin from 3.3 volts to 1.8 and from the HG I have enough specs to figure it out.