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fa31
Associate III
May 27, 2025
Solved

FreeRTOS in Trustzone

  • May 27, 2025
  • 2 replies
  • 587 views

Hi,

I am trying to add FreeRTOS to my project.

Board = Nucleo-U5A5ZJ-Q

Trustzone = enabled

FreeRTOS = in non-secure project

 

 

I have Trustzone enabled, therefore a secure and a non-secure project is generated by CubeMX. I added FreeRTOS in the non-secure project. Upon building the project, it gives the following errors (the output is modified to remove additional build information and long project paths):

 

 
.../GCC/ARM_CM33/non_secure/port.c.obj: in function `vPortSVCHandler_C':
[build] .../Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM33/non_secure/port.c:1042: undefined reference to `SecureContext_AllocateContext'
[build] .../Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM33/non_secure/port.c:1047: undefined reference to `SecureContext_LoadContext'
[build] .../Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM33/non_secure/port.c:1058: undefined reference to `SecureContext_FreeContext'
[build] .../Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM33/non_secure/port.c:1067: undefined reference to `SecureInit_DePrioritizeNSExceptions'
[build] .../Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM33/non_secure/port.c:1070: undefined reference to `SecureContext_Init'
[build] .../GCC/ARM_CM33/non_secure/portasm.c.obj: in function `PendSV_Handler':
[build] .../Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM33/non_secure/portasm.c:423: undefined reference to `SecureContext_SaveContext'
[build] .../Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM33/non_secure/portasm.c:423: undefined reference to `SecureContext_LoadContext'
 
 
How do I solve these error?
I have already tried the steps described in this post and they did not help me.
 
Thanks!
 
 
 

 

Best answer by Sarra.S

Hello @fa31, 

The errors you're getting are related to missing references for secure context functions in your FreeRTOS setup.

You need to include these FreeRTOS files in your Secure project to handle context switching between secure and non-secure parts of the application

  • secure_context.c
  • secure_context_port.c
  • secure_context_port_asm.s
  • secure_heap.c
  • secure_init.c

Hope that helps!

2 replies

S
Sarra.SBest answer
ST Employee
May 28, 2025

Hello @fa31, 

The errors you're getting are related to missing references for secure context functions in your FreeRTOS setup.

You need to include these FreeRTOS files in your Secure project to handle context switching between secure and non-secure parts of the application

  • secure_context.c
  • secure_context_port.c
  • secure_context_port_asm.s
  • secure_heap.c
  • secure_init.c

Hope that helps!

F
fa31Author
Associate III
May 28, 2025

Thank you @Sarra.S for the reply. 

For someone trying to solve the same errors:

I added those files from FreeRTOS official git repo: link.

Added the files in my project under Middlewares -> Third_Party -> FreeRTOS -> Source -> portable -> GCC -> ARM_CM33 -> secure, and then added the file paths into my CMakeList and was able to build the project without any errors. 

    NickO
    NickO
    Associate III
    December 3, 2025

    Hi

     

    I had a similar issue.

    • In Cube MX, Pinout and Configuration->Software Packs->Select Components
    • Change "Show Components for Context" to Secure
    • Add the package X-CUBE-FREERTOS
    • Click OK

      Note this is for secureNote this is for secure


    • Now Select X-CUBE-FREERTOS under Middleware and Software Packs. I select CMSIS RTOS v2 (as I need the portable API)

     

    Have you had success using it?

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