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Hello,
I have systems that seem to fail to power up after a long (~24 h) shutdown period (they do startup, but crash while configuring a NOR flash). Reproduction is impossible any faster, but when it goes wrong, it keeps on going wrong until a long power-off period.
NOTE: The watchdog is enabled, but does not reset the processor, so the system stayed in a failed state!
Debugger that is connected to a running machine that is to fail cannot see much as the connection with the target is lost. Somebody suggested that the AHB bus crashes/jams/something. Do you a theory how this can happen?