imx7d not booting upimx

[flabyjacob]

hello all,

we  are working with custom board based on imx7d,

our board is not booting up as our board have same basic interfaces like SD card in MMC0 interface and uart is also same initially we got two boards,

one board is working and other is not ,

in working board we have done DDR calibration using ddr stress tool with the help of excel sheet and it was successful and board was booting up also but with second board we were not able to boot with same configuration then we tried to do DDR calibration app is hanging with all buttons grayed out.

we probed and saw that sd card access is happening but nothing is coming in terminal.

can you tell us what may be the issue.

[igorpadykov · Accepted solution]

Hi Flaby

reason for hanging DDR calibration app may be harwdare issues:

poor soldering, one can try to resolder chip. Also recommended to recheck

hardware using Hardware Development Guide for i.MX7Dual and 7Solo Applications Processors

Best regards
igor
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[flabyjacob]

hi igorpadykov,

thank for your reply, actually it is hardware problem they replaced one inductor and board is working now.

thank you.