Secure Boot Process on LPC55S16

jesm86 — Thu, 21 Sep 2023 13:06:54 GMT

Hello,

I am currently in the process of getting familiar with the security features of the LPC55S16 Cortex-M33. At the moment I am focussing on Secure Boot.

I have worked through AN12283 and also read through the online documentation about the SPSDK.

I think I managed to get secure boot running and the behavior is as expected: When writing an image that was signed with blhost to the memory, the microcontroller runs normally. As soon as I write an unsigned image with blhost to the memory nothing happens.

My question would now be the following: I am looking for a way to get a "image verification failed" message of something printed to the terminal or to a debugger. I.e. is there a way to debug the boot process/bootloader or an -v (verbose) option for it? I somehow need to verify that what I expect is happening here is indeed really the case.

Of course I cant use a normal debugger like Segger Ozone when secure boot is enabled, so this option won't work.

Any suggestion or hint is appreaciated.

Thanks in advance!

Re: Secure Boot Process on LPC55S16

Alice_Yang — Mon, 25 Sep 2023 10:17:08 GMT

Hello @jesm86

Take security in to consider, there is no method to debug.

BTW, there is a GUI tool for secure boot:

https://www.nxp.com/design/software/development-software/mcuxpresso-software-and-tools-/mcuxpresso-secure-provisioning-tool:MCUXPRESSO-SECURE-PROVISIONING

Alice

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Secure Boot Process on LPC55S16

Re: Secure Boot Process on LPC55S16