i.mxrt1050 SPI NAND flash boot problem

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i.mxrt1050 SPI NAND flash boot problem

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Contributor I
We encountered an issue when we test boot from nand flash and run in sram. 
After download the firmware through USB using MfgTools.exe, keep the power on, every time we press RESET key to reset i.mxrt1050, firmware always boot from nand flash and run in sram successfully. 
But, firmware always fails to boot from nand flash after power cycle, and seems device turn into serial download mode.
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NXP TechSupport
NXP TechSupport

Hi Li

this may be caused by power up sequence, one can check

if voltages and clocks are stable when POR released, use

sect.4.2.1.1 Power-up sequence i.MXRT1050 Datasheet
https://www.nxp.com/docs/en/data-sheet/IMXRT1050CEC.pdf

and sect.6. Boot, reset, and miscellaneous Hardware Development Guide for

the MIMXRT1050 Processor
https://www.nxp.com/docs/en/user-guide/MIMXRT1050EVKHUG.pdf

Best regards
igor
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