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Original question:

AM62A7-Q1: modify sec-cfg.yaml

AM62A7-Q1: KeyWriter - otp extended data

Toby JIN
Prodigy 40 points
Part Number: AM62A7-Q1

Tool/software:

Hi, TI experts

      Now, We have used Key-Writer tools to flash otp extended region.

      We find that there is no option with --ext-otp-ovrd in gen_keywr_cert.sh script, so we can't override the data of opt extended region, even though the device type is also HS-FS.

      Is this exact ?

      Another problem is that We can read the data of opt extended region in A53 core via optee when  the device type is also HS-FS, not HS-SE

     Is this exact ?

Thanks !

  • 0
    TI__Guru 50861 points

    Hello,

    Toby JIN said:
    We find that there is no option with --ext-otp-ovrd in gen_keywr_cert.sh script, so we can't override the data of opt extended region, even though the device type is also HS-FS.

    That is expected. The keywriter itself does not have the support for overriding the EXT OTP data. If required, you may use the TISCI API for writing the OTP row with a modified value than the initially programmed one as long as the modified value does not result in a bit flip of 1 -> 0.

    Toby JIN said:
    Is this exact ?

    The EXT OTP rows can be read in both HSFS & HSSE state.

    Regards,

    Prashant