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BBoge.2
BBoge.2
Associate II
January 10, 2023
Solved

OTP 3 Bit 15 -> no data cache

  • January 10, 2023
  • 2 replies
  • 1803 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?

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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

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2 replies

PatrickF
PatrickFBest answer
ST Employee
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'

In order to give better visibility on the answered topics, please click on 'Best Answer' on the reply which solved your issue or answered your question.Tip of the day: Try Sidekick STM32 AI agent
BBoge.2
BBoge.2Author
Associate II
January 11, 2023

Thank you for the fast support.

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