Hi Takashi
processor will not boot if any of these power supplies
(except DRAM_VREF) will not have proper voltages, as
this is required by power - up sequence. When POR is deasserted
all power supplies and clocks should be applied according to datasheet
requirements. I think some kind of failure analysis can be found in
Chapter 8 "Avoiding Board Bring-up Problems"
i.MX6 System Development User’s Guide (rev.1, 6/2013)
http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf
Best regards
igor
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