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AM62A7-Q1: Flash OTP KEY Fuse

JIN Toby
Prodigy 30 points
Part Number: AM62A7-Q1
Other Parts Discussed in Thread: AM62A7

Tool/software:

Hi TI experts

     Now, We want to upgrade the device type from HS_FS to HS_SE.

    The step is that

     1. Enable VPP, flash the kw_tiboot3 to SoC by USB util, and the Disable VPP. ---> the step is successful

     2. At once, flash the images to SoC by USB utils , the dfu image is signed by the correct key ---> the step is failed

     3. If powered off and on the SoC after step 1,  repeat the step 2 that flash the image is successfully.

So we want to ask what can we do by software control, We can flash key and image combined into one step that can enhance the efficiency of produce.

Thanks

Toby

  • 0
    TI__Guru 70231 points
    JIN Toby said:
    2. At once, flash the images to SoC by USB utils , the dfu image is signed by the correct key ---> the step is failed

    How are you flashing the images as the keywriter doesn't have the USB support?

  • 0
    Prodigy 30 points

    After flashing KEY, the kw-boot3.bin will execute reboot, which leads AM62A7 warm reset.

    Then, We will process dfu_flash.py script to flash images. This step is failed.

    log is above

    Now, After flashing key, we need hard reset, and then process dfu_flash.py script to flash images. This step is OK

    So,  Is the process of hard reset  mandatory between flashing key and flashing images?

    We want to flash key and image combined into one step that can enhance the efficiency of produce.

    what should we do?

    Thanks

  • 0
    Prodigy 30 points

    We want to flash key and image into one step, and don't need to hard reset what should we do?

  • +1 in reply to JIN Toby
    TI__Guru 70231 points

    After flashing the keys, the device is converted to HSSE only after a cold reset. If you do a warm reset then the device would still be in HSFS state.

    JIN Toby said:
    We want to flash key and image combined into one step that can enhance the efficiency of produce.

    You should boot the HSFS DFU images while flashing the HSSE images.