Hi Theevan
first please follow Hardware Development Guide for the i.MX 6UltraLite Applications Processor
https://www.nxp.com/docs/en/user-guide/IMX6ULLHDG.pdf
Run ddr test
i.MX6/7 DDR Stress Test Tool V2.80
Check power up sequence described in datasheet
http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6ULLCEC.pdf
Best regards
igor
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