iMX6ULZ instalble NAND boot

[jupiter_hce]

Hi,

When I turned power up to my device, it could boot from NAND most of times, but occasionally it stopped at boot loader prompt => which can only be found at debug console if a debug cable is connected to the device in the development lab. That confused people and make the device unreliable, people expect the device can be booted every time.

Some HW engineers said it might need a pullup resistor to secure the NAND boot, I really don't understand what that means, could someone from NXP advise what could cause that issue? Is because the device doesn't have sufficient voltage?

Thank you.

JH

[igorpadykov · Accepted solution]

Hi Jupiter

one can check power-up sequence, for example prolong POR up to 1 sec. to verify

that all power supplies and clocks become stable at POR release.

Best regards
igor