For device, I tried:
1) the preloaded Android image with EMMC boot;
2) a self-built fsl-image-validation-imx image with SD boot.
For the host side, I tried both mac OS and ubuntu-16.04 with minicom.
Right now, both images can boot up, and the UART ports can print the system logs correctly.
However, if I want to interact with the UART port like typing any command in the UART port
, the UART becomes very slow, and even no response to my input after a while.