No experience with Olimex A20 unfortunately. I did easily get the hub to work on an Odroid, however, so I know it can work on other platforms. Though once I tried it on the RPi 3 I just left it there.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
No experience with Olimex A20 unfortunately. I did easily get the hub to work on an Odroid, however, so I know it can work on other platforms. Though once I tried it on the RPi 3 I just left it there.