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[Cortex-M3] Execution code from RAM during Flash Programming

Rohit Pathak
I am writing a bootloader for Cortex M3 Toshiba controller.

During Flash Programming I need to execute code from RAM as entire Flash is inaccessible during write/erase operations

I wish to know how to copy code from FLASH to RAM and execute that code from RAM.

Thanks...
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  • Arm Employee Badge
    Note: This was originally posted on 10th April 2012 at http://forums.arm.com

    Hi Kent,

    It depends on how you want the project to look like.

    If the program code in RAM is created as a completely independent project, and then merged into your other project running in flash using a hex file editor, then you don't have to use scatter files. In this way you will have two separated images in your running system. This can make sure you don't accidentally call a function in flash or read it when you are programming the flash.

    If you are trying to create a project that contains code running in flash as well as code running in SRAM, then you need to define the code running in SRAM with a section name, and then use linker script to specify this section is to be copied to and executed from SRAM.

    regards,
    Joseph
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  • Arm Employee Badge
    Note: This was originally posted on 10th April 2012 at http://forums.arm.com

    Hi Kent,

    It depends on how you want the project to look like.

    If the program code in RAM is created as a completely independent project, and then merged into your other project running in flash using a hex file editor, then you don't have to use scatter files. In this way you will have two separated images in your running system. This can make sure you don't accidentally call a function in flash or read it when you are programming the flash.

    If you are trying to create a project that contains code running in flash as well as code running in SRAM, then you need to define the code running in SRAM with a section name, and then use linker script to specify this section is to be copied to and executed from SRAM.

    regards,
    Joseph
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