How to protect the code inside internal flash?
The currently released engineering grade samples of processor do not have Security feature implemented. The security feature will be available in production samples and the more details about it will be provided through Hardware Reference Manual. Currently, you can find following note in the datasheet:
The processor provides a combination of hardware and software protection mechanisms that lock out access to the part in secure mode, but grant access in open mode. These mechanisms include password-protected slave boot modes (SPI and UART), as well as password-protected JTAG/SWD debug interfaces.
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