Hi, Sorry to post this again, as I did not get answer from the previous related question. Is RTAI compatible with RTLinux? As I want to use the features of LXRT of RTAI, but my device driver was based on RTLinux. I wish a user space process of LXRT could access (read or write) the FIFO created by a RTLinux thread or process. Any comments are welcome. Thanks. Dingrong Yi