[SOLVED] J-Trace/J-Link preserve memory location on programming

  • [SOLVED] J-Trace/J-Link preserve memory location on programming

    Hello

    I'm searching for a way to preserve a user defined memory location from programming with my j-trace. The section i want to preserve is the section in the flash of my Chip (STM32H7) where i'm storing my parameters and i don't want to erase this section every time i reflash a program to the chip.

    I know this function from microchip and there i got a field in the properties of the debugger (real ice) where i was able to insert a range of storage addresses which were read and concatenated into the hex-file before programming the whole new hex file.

    Is such function possible with the segger j-link/j-trace products?

    Regards Thomas

  • Hi,
    Thank you for your inquiry.

    There are two cases:
    Case 1 - The preserve data is in one or more sectors and there is no data to be flashed to these sectors:
    J-Link Commander:
    a) Make sure there is no data at the preserve data location in your data file.
    b) erase the exact area to be flashed with the erase<range> command.

    c) Flash the data file via the "loadfile" command.
    J-Flash:
    a) Make sure that Project Settings -> Production -> Actions performed by Production programming -> Erase is set to "selected sectors"
    b) Make sure there is no data at the preserve data sector in your data file.
    c) Program the device (Target -> "Production Programming" (F7))

    Case 2 - There is data to be flashed to the sectors the preserve data is located at:
    J-Link Commander:
    a) Make sure there is no data at the preserve data location in your data file.
    b) Open the J-Link Commander (JLink.exe) and use the SetFlashDLNoRMWThreshold exec command (exec SetFlashDLNoRMWThreshold).
    c) erase the exact area to be flashed with the erase<range> command.
    d) Flash the data file via the "loadfile" command.
    J-Flash:
    a) Read back the preserve area (Target Manual Programming -> Read back -> Range)
    b) Merge the read back data to your hex file (File -> Merge data file...).
    c) Program the device with the merged data (Target -> "Production Programming" (F7))

    All the above options are scriptable.

    Does this answer your question?

    Best regards,
    Fabian
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