@rejuce Libsocketcan is still optional, but gives additional functions, as stated here: https://doc.qt.io/qt-5/qtserialbus-socketcan-overview.html If you don't use that, you can safely ignore the warning. But if you install the libsocketcan library, that's fine too. Regards

@J-Hilk A colleague of mine tried the 5.12.4, but the error is still there. I'll try with the QQuickPaintedItem or I'll switch to the 5.14. Thanks for your time.

@Saman19 said in Qt on MarsBoard, Cross compile error, Socket can fd: Note: QtSerialBus: Newer kernel needed for flexible data-rate frame support (canfd_frame). It does not seem to me a problem but an informative note. If you do not use CAN, check: Is Kernel Network CAN enabled? Something like: Networking support ---> <M> CAN bus subsystem support ---> --- CAN bus subsystem support <M> Raw CAN Protocol (raw access with CAN-ID filtering) <M> Broadcast Manager CAN Protocol (with content filtering) CAN Device Drivers ---> <M> Virtual Local CAN Interface (vcan) <M> Platform CAN drivers with Netlink support Mandatory, because under the kernel is the SocketCAN that handles this. Install the can-utils package It is necessary to include / install QtSerialPort, not for CAN but for ModBus that is part of QtSerialBus. Cleiton Bueno Blog | Linkedin | B2Open