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AM62P-Q1: AM62Px: Custom SW for e-fuse writing

Carlo Pettinato
Prodigy 10 points

Part Number: AM62P-Q1

I would like to run a custom software on the R5F core that can receive a CAN frame that triggers e-fuse writing for the enforcement of Secure Boot.

If this is possible, can you provide with an example or links to the relevant documentation (e.g., API for Secure Boot e-fuse writing)?

  • 0
    TI__Guru* 77721 points

    Hello,

    If you mean writing the keys to efuses and converting the device to HSSE then it can only be done through the standalone keywriter package.

  • 0
    Prodigy 10 points

    Hello,

    yes, I'm referring to as writing the keys to efuses and converting the device to HS-SE.

    Can you confirm the above operation can only be done through the standalone OTP keywriter package and the execution of such keywriter cannot be controlled from "outside" (e.g., triggered via CAN frame)?

  • 0 in reply to Carlo Pettinato
    TI__Guru* 77721 points

    Hello,

    Carlo Pettinato said:
    Can you confirm the above operation can only be done through the standalone OTP keywriter package

    Yes, it can only be done through the standalone keywriter package. The only way for a custom software to run the keywriter binary is to reset the SoC to the boot media over which the keywriter binary boots. Please note a cold power on reset is required after the keywriting.

    Carlo Pettinato said:
    I would like to run a custom software on the R5F core that can receive a CAN frame that triggers e-fuse writing for the enforcement of Secure Boot.

    May I know the reason for this design?

    The keywriting is supposed to be done in a factory environment where the SoC is converted to HSSE and the signed images are flashed independently.

    Thanks!