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IMX RT1020 CEC external flash programming

Question asked by i b on Oct 15, 2019
Latest reply on Oct 15, 2019 by Kerry Zhou

Hello,

 

we have custom design based on IMXRT 1020 development board. CPU IMXRT1020 CEC, serial flash IS25LP064.

 

Boot strap configuration: A0 - A12 (except A10) has 47 K pull down resistors; A1 also has 1K pull up resistor.

Using JLINK to program the flash...

 

During the programming we can probe and see activities on follow SPI lines: CS/SO/SI/SCK. Issue what we are having once programming is complete and IMX RT suppose to boot up, we do see activities on SCK and CS, but nothing coming from SO (line from Serial Flash to MCU).

 

Any word of advise...

 

Thank you.

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