verify that the SPI interface is enabled, you can do it from the console or from the graphical interface in raspi-config
make sure you have the PANS R2 firmware installed and configured as a bridge
run minicom as follows:
minicom -D /dev/serial0 -b115200
write the command si
dwm> si
look for the version and mode
sys: fw2 fw_ver=x01030001 cfg_ver=x00010700
mode: bn (act,-)