https://www.parallella.org/2015/07/31/parallella-gets-a-camera/
Also, do note that USB on the Parallella is (or at least used to be) somewhat flaky. For some people, it worked flawless, while others never got a stable link.
Sylvain’s open source code showing how to use the solution can be found in https://github.com/parallella/parallella-examples/tree/master/rpi-camera
https://github.com/daveshah1/CSI2Rx
https://github.com/smunaut/axi-csi-rx
git clone https://github.com/parallella/parallella-examples.git
git clone https://github.com/parallella/parallella-flash.git