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STM32F4 different run from chip vs Debugger

Question asked by pilli.isaac.001 on Jan 23, 2015
An application which includes DMA over SPI communication protocol is running nicely once STM32F405 is powered up. However, once running the same code from debugger - it does NOT behave properly.
What might be the cause(s) for the difference?

Some more info: The debugger is an IAR I-jet and the development tool is Workbench IDE 7.30. CPU system clock is 36MHz from the HSI.