On 3 Oct 2020, at 17.41, Marco Cavallini [KOAN] <m.cavallini@koansoftware.com> wrote:
When I connect the board to my Linux PC using the USB cable it isn't detected from lsusb nor dmesg
I am not able to understand how to flash Zephyr on it.

Have you followed the instructions in https://docs.zephyrproject.org/latest/boards/arm/reel_board/doc/index.html#programming-and-debugging?

Does anybody can give me advice how to use this reference board with Zephyr?

Are you using the correct USB connector on the reel_board? You need to plug-in a cable between your host computer and the reel board “Debug USB” connector.

Best regards,
Brix
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Henrik Brix Andersen