[SOLVED] Ozone Cortex-M - download part of hex file or elf file

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  • [SOLVED] Ozone Cortex-M - download part of hex file or elf file

    I have a project that writes configuration data into part of the flash memory. It is always in the same memory range. I would like to be able to preserve that data in flash between downloads. I was trying to find in the manual a description of this use case, but couldn't find any. I compile with GCC, that section of my linker script looks like:

    /* Memories definition */
    MEMORY
    {
    RAM (xrw): ORIGIN = 0x20000000, LENGTH = 160K
    /* Pages 0 - 250 : System Firmware*/
    ROM (rx): ORIGIN = 0x08000000, LENGTH = 502K
    /* Page 251 : FW update checksum and decryption */
    CFG_DATA1 (rx) : ORIGIN = 0x0807D800, LENGTH = 2K
    /* Pages 252 - 255 : AWS thing name and keys */
    CFG_DATA2 (rx) : ORIGIN = 0x0807E000, LENGTH = 8K
    }


    So basically, I would normally like to erase and program only the MEMORY section called ROM above and not CFG_DATA1 or CFG_DATA2. There are times that I may need to erase those sections as well, but normally, I'd like to preserve their contents.

    I think that I probably need a custom script for TargetDownload, but I'm not sure. It seems to me that this is a fairly common use-case, but I can't find any help on the web for this.

    Any help would be greatly appreciated.
  • Hello,

    Thank you for your inquiry.
    How to tell J-Link to preserve larger areas of Flash memory is explained here:
    wiki.segger.com/Read-Modify-Write_Flash

    How to use the command string in Ozone is explained in the Ozone user manual.

    Is that what you were looking for?

    Best regards,
    Nino
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