To clarify one thing, when the __PRODUCT_JALAPENO or __PRODUCT_LITTLE_SINGLE  is selected, the crystal used for the MCU should be 16MHz. However for SINGLE or MINIRIG models, then the crystal
used should be 12MHz, otherwise the Frequency of the ASICs is going to be incorrectly calculated (that is where you get 320MHz speed report, etc).


Regards,
Nasser