I am using iMx8QX processor. I have compiled the bsp for both linux and free rtos. Now next task is to provide communication between them. But I need to provide secure IPC communication. Whether RPmsg is using secured IPC ? RPmsg is the only one way for communication ? RPMsg works in kernel as a module(.ko),and the demo(pingpong) don't receive any data from other source ,the data it send is produced by itself,So how does the RPMsg receive data from user application and How can I transport data between A9 user application and M4 user application ?