Where could I get the assignment of all the SPI and I2C busses which are supported by the software (Ubuntu). Most importantly the power supply chip BP25892 - the Joule talks to it via I2C.
Thanks for your interest in the Intel® Joule Platform.
We would like to investigate a little bit more regarding your inquiry, and as soon as we find useful information we'll let you know. We'll appreciate your patience during the meantime.
Thanks for your patience. We have been investigating regarding your inquiries, however, the Ubuntu is still in beta and we would like to suggest you to contact Ubuntu support https://developer.ubuntu.com/en/snappy/start/intel-joule/ https://developer.ubuntu.com/en/snappy/start/intel-joule/ since they are in charge and they could give you a more accurate answer.