[Linaro-validation] Could not get master image booted properly

Hi, I am trying to run LAVA instance with Pandaboard-es,but getting an error says ​"Resetting platform into master image failed: Soft reboot failed"​.

Attaching the complete log file. Please help me to resolve the problem.Please feel free to ask if any further data is required to identify the issue

NOTE: I am using a USB-serial converter to connect pandaboard. The log seems little scrambled because the USB-serial converter is not working properly.