If this board behaves similar to my RADDS then the flashing is due to sd-card sync issues. It flashes a few times and even the steppers seem to move a bit, but once the sd-card is sync'd it works. ( 5-10 flashes after a cold boot )
There was an FW update for my RADDS that helped a lot against this issue, but I'm not sure what smoothieware can do for you.