I am looking into adding support for the Raspberry Pi Pico W which uses the 
Infineon’s CYW43439 WiFi chip.

Rather than trying to write I complete interface to this chip, I was wondering 
whether it would be appropriate to build with the code in the Pico-SDK supplied 
by the Raspberry Pi foundation.  

The library Pico-SDK uses to communicate with the  CYW43439 is Copyright George 
Robotics Pty Ltd, and is generally licensed for non-commercial purposes.  It is 
also licensed for use with the RP2040 (or other Raspberry Pi Foundation chips) 
in a manner that permits commercial use.

Any thoughts on this would be appreciated.

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