topic Re: LPC55S6x Secure Boot Threadx Execution Error in LPC Microcontrollers

LPC55S6x Secure Boot Threadx Execution Error

jean_b — Tue, 21 Feb 2023 08:43:37 GMT

Hello,

I am experiencing issues when using the Secure Boot on a LPC55S69 JBD100 microcontroller.
I am trying to sign my software to ensure the integrity of the flashed image. For that I am following the AN12283 guide to activate the SecureBoot and sign my binaries.
I have:
- generated the certificates using openssl (section 3)
- signed the image (section 5.2)
- flashed it (section 5.3)
- prepared the CMPA and CFPA pages (sections 5.4 and 5.5)

I can see the main is correctly executed thanks to some logs, however after a millisecond I cannot see any operation performed. The Initialization completes, but the threads never start. And no error is reported through the HardFault handler.
When the secure boot is not active, the elf or unsigned binary images operate correctly, the threads automotically start after the initialization. Only in the signed image it does not.

It does not look like the error is with the signature in itself as the image is loading. So the verifications have passed correctly. So I do not understand how it can impact the threads execution. I have checked the signed binaries, they are identical to the unsigned ones except the image length, image type, image header offset fields, and the signature appended to the binary.

I tried to use a signed image of the lpc55S69 Threadx demo on an LPC55S69 evaluation board as well, and I get the exact same error.

What can cause this ?

Microcontroller: LPC55S69JBD100 B1
OS: AzureRTOS, with Threadx
Tools:
openssl 3.0.2
elftosb-gui 1.0.12
blhost 2.6.2

Thank you in advance and have a nice day

Re: LPC55S6x Secure Boot Threadx Execution Error

Pavel_Hernandez — Tue, 21 Feb 2023 23:50:11 GMT

Hello, my name is Pavel, and I will be supporting your case, let me research more information about this.

Best regards,
Pavel

Re: LPC55S6x Secure Boot Threadx Execution Error

Pavel_Hernandez — Wed, 22 Feb 2023 00:31:51 GMT

Hello, sorry I notice this case has another replay, I will support your case in that.

Best regards,
Pavel

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Re: LPC55S6x Secure Boot Threadx Execution Error

rjmalmeida0 — Thu, 15 Feb 2024 09:15:53 GMT

I am also having trouble flashing a secure image of a ThreadX program. The initialization runs but no threads start.