my board is IMX6Q/DL SABRESD ,on which is running the Android6.0.1. I use the uart4(ttymxc3) to recevice data, but the problem ：When the data length reaches 4096, the data is transmitted everytime ,In other words ,we can't read data if the uart buffer can't reach 4096 byte. I don't know what and why caused the problem ,and how to solve it ! Thank you !!