Hi pushpa
boot process is described in Chapter 8 System Boot
i.MX6DQ Reference Manual (rev.3 7/2015)
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf
For Uboot one can look at app note
U-Boot for i.MX51 Based Designs
http://cache.freescale.com/files/dsp/doc/app_note/AN4173.pdf
Best regards
igor
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