OTP 9 bit 0 -> disable ROM code traces

[BBoge.2]

What does the OTP 9 Bit 0 do?

There is nothing in the ref manual.

[PatrickF]

Hi @BBoge.2​ 

this bit is for ST internal development purposes, it is recommended to keep it at 0.

ROM code traces are described here and are the only way to debug 1st level boot issues: See https://wiki.st.com/stm32mpu/wiki/STM32_MPU_ROM_trace_analyzer

Regards

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[BBoge.2]

Thank you.

That means if the device is already closed the debugging will also not work.