OTP 3 Bit 15 -> no data cache

[BBoge.2]

What does the OTP 3 Bit 15 do?

Can I disable the boot cache for more security? Or does it have more impact on the system?

[PatrickF · Accepted solution]

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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[BBoge.2]

Thank you for the fast support.