i.MX6Q boot issue from eMMC

[jimmyli]

Hi,

     We have a problem showed below:

     1.Condition

        1> Schematic is based on MCIMX6Q-SDB;

        2> Chip : MCIMX6Q5EYM10AD

      2.Problem:

        1> One board(new board) can boot to serial download mode and download the image; Then, configuring the board to boot from fuse in eMMC(have been configured), but the board will still boot to serial download sometimes(not always, maybe happens one in two hundred times).

        2> We replaced another chip(the same type), then the problem will not happen again.

        3> We doubt that the chip is damaged before, but can't find the reason.

     Hope to help us to analyze.

     Thanks a lot.

[igorpadykov]

Hi Jimmy

for problematic chip one can run ddr test

i.MX6/7 DDR Stress Test Tool V2.92 

and update image with new ddr calibration coefficients.

Also one can try to prolong POR during power-up, to check if issue

is caused by crystal slow start-up.

Best regards
igor
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