Initially i used a custom board for imx6ul and successfully able to boot from SD card for Linux 3.14.
Now, I am using the same custom board for imx6ull, with just changing the processor. I figured out that both imx6ul and imx6ull are pin to pin compatible. So I guess its not the problem of processor. Now the thing is I am unable to boot Linux 4.1 through SD card in imx6ull. I am stuck at " waiting for root device /dev/mmcblk0p2".
What could be wrong with this procedure?