Let say a MCU has Flash and SRAM memory. While compiling a program, I specify the main function program code to be located in SRAM (this is done by modifying the linker script). After load the binaries to the MCU. The MCU runs properly. I was wondering what kind of things are happening when the RESET/REBOOT is occurred. Since SRAM is a volatile memory, it will lose data when it is not powered. I am not familiar with how the linker script is used to map the program code to an memory address.
Some references will be really helpful. Thanks!
Hello,
If we are talking about soft reset, the SRAM is supposed to retain its contents. However, if you are programming with C, the environment will be restarted so maybe it is necessary to take precautions on values that will be reinitialized as well...
Hi Bruno Senzio,
Thanks for your answer. I was talking about hard reset, I pressed the reset button of the MCU and the MCU goes through reboot procedure and then starts to work properly. So I was wondering there must be a procedure that moving the program code from non-volatile memory (e.g. FLASH) to SRAM every time the MCU goes through reset/reboot procedure. But I don't have any idea how the procedure goes, and how it works along with the linker script.
Hello Mr. Rizal,
I think as long as it is not a POR, SRAM shall retain its values.
Also, every time that a reset occurs, you might have a reset cause register than can tell you what kind of reset/reboot happened( soft reset like pushing the button, BOD, POR...).
Maybe based on this event, you might actually tell your linker script. I think that would depend especifically of the MCU that you are using.
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