Hi veeranjaneyulu
it is necessary to reprogram UART baudrate, please check
sect.64.5 Binary Rate Multiplier (BRM) i.MX6 RM.
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf
during boot this can be done using plugin
u-boot plugin.bin
uboot-imx.git - Freescale i.MX u-boot Tree
or add codes to uboot codes.
Best regards
igor
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