The official software and documentation change is in progress for designs choosing to use the optional crystal, instead of the Low Power Oscillator (LPO). For software, the strategy will be to provide an API that applications can call to enable the crystal circuit and re-mux the pins that are shared with those pins.
Note: Due to internal pin multiplexing and packaging decisions, the use of the optional crystal affects some of the alternate pin functionality.
For BCM20732S (48-pin LGA) module designs, the crystal consumes:
· Pin 43 (XTALO32K) which makes ADC/GPIO:P12 unavailable. P26 may still be available.
· Pin 44 (XTALI32K) which makes ADC/GPIO:P11 unavailable. P27 may still be available.
Internal conversations are taking place for final documentation, but it looks like customers using the BCM20732S device may also be able to continue to use P26 and P27; which is contrary to the currently published Technical Reference Manual. Standby for final disclosure...