Cyclone V SoC: failed to start applying Altera Devcie Tree overlay

I followed the steps to build a Linux Image and the U-boot as provided in :

After all the steps, when I try to boot the Altera SoC board, I get the following error : failed to start applying Altera Devcie Tree overlay.
I am also unable to access the LCD, which I could before using a simple LCD program.

Running the dmesg , I observe one more error :
ttyS0 - failed to request DMA

can anyone let me know what the issue is here?