Can't login over UART.

When MatrixTV is booted, I can't login using COM port of Matrix ARM. It doesn't accepts password for root, like this:
So, it doesn't hides first symbol of password when logging in. Connecting over ssh works fine though.
MatrixTv login: root
Password: r
Error: password is incorrect.
So, it doesn't hides first symbol of password when logging in. Connecting over ssh works fine though.