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BBoge.2
Visitor II
January 10, 2023
Solved

OTP 3 Bit 15 -> no data cache

  • January 10, 2023
  • 2 replies
  • 956 views

What does the OTP 3 Bit 15 do?

0693W00000Y7paKQAR.pngCan I disable the boot cache for more security? Or does it have more impact on the system?

    This topic has been closed for replies.
    Best answer by PatrickF

    Hi,

    this bit is for ST internal development purposes, it is recommended to keep it at 0.

    Disabling does not bring more security as cache is not used by BootROM in critical authentication phases but only to speed up signature verification. I think cache content is erased before BootROM exit.

    Regards

    In order to give better visibility on the answered topics, please click on 'Select as Best' on the reply which solved your issue or answered your question. See also 'Best Answers'

    2 replies

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    PatrickFAnswer
    Technical Moderator
    January 10, 2023

    Hi,

    this bit is for ST internal development purposes, it is recommended to keep it at 0.

    Disabling does not bring more security as cache is not used by BootROM in critical authentication phases but only to speed up signature verification. I think cache content is erased before BootROM exit.

    Regards

    In order to give better visibility on the answered topics, please click on 'Select as Best' on the reply which solved your issue or answered your question. See also 'Best Answers'

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    BBoge.2Author
    Visitor II
    January 11, 2023

    Thank you for the fast support.

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