Thanks for your reply.
1. Do you get messages on the serial console if you use one of our pre-compiled images?
I have taken the Ubuntu Trusty 14.04 images from the below link.http://www.armhf.com/boards/wandboard/
but I didn't get any messages on the serial console.
2. If your console setup (baud rate, cables etc) is correct, then my first guess is that your u-boot console parameter is set up wrong.
I configured the console parameters as below:
baudrate for 115200
hardware flow control : tried with "yes" and "no"
and I ensure all the cables are working properly.
I tried with Android 5.0 Lollipop Image for Wandboard Development Boards. I have taken images files from below linkhttp://www.cnx-software.com/2015/02/18/ ... nt-boards/