How to connect a 4-pin OSC (crystal oscillator) to an IMU (BNO055) with only 2 pins dedicated to an external clock?
This is delayed answer, but I feel it is important to avoid confusion.
BNO055 cannot use logic level clock, therefore external crystal is required, unless CLK_SEL bit is cleared (default state) to activate internal clock.
See a relevant answer in this discussion at Bosch forum.
I would also recommend reading this topic for important changes in bypassing capacitor values, still missing from datasheet.