3~5% portion of nRF52832 chips does not start without debugger

[knowic]

Hello,

We are experiencing an issue that some of the nRF52832 is not starting up automatically. But we attached it with JLINK
debugger and didn't do anything, it can boot smoothly. There are 3~5% portion with this case of 400~500pcs production.

We have checked with this post, but we haven't enable "--specs=rdimon.specs" option with the linker.

https://devzone.nordicsemi.com/f/nordic-q-a/14618/nrf52-does-not-start-without-debugger

Do you have any suggestions as to what could be the reason?

Many thanks, JasonHu

[mtsunstrum]

One possibility is that if it is a DFU Bootloader, it does not see an application image ( or a corrupted one ) and hence it won't start up your application.

Using JLINK debugger you can see where the code is stuck, and also can compare the flash memory contents to the expected file contents.