Architecture Limitations for llext on nRF9160-DK

[Sunny_1982]

Hello,

We are using the nRF9160-DK (ARM platform) and are running the llext examples. However, we encounter a NULL return when calling llext_find_sym(). Could you please confirm if there are any architecture limitations or known issues related to using llext on the nRF9160-DK

We are using the module below to verify the llext functionality. 

https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/llext/modules

Here are the configuration we tried:

CONFIG_ARM_MPU=n
CONFIG_ARM_AARCH32_MMU=n

CONFIG_USERSPACE=n

CONFIG_TRUSTED_EXECUTION_NONSECURE=y

We commented the printk statement and crash is observed, logs are provided in the link below.

Crash logs: https://drive.google.com/file/d/1TWCxfk2OyxBhDFBD4J0x43b8Su7x49Sn/view?usp=sharing

https://github.com/zephyrproject-rtos/zephyr/blob/main/samples/subsys/llext/modules/src/hello_world_ext.c#L24

Logs https://drive.google.com/file/d/1TWCxfk2OyxBhDFBD4J0x43b8Su7x49Sn/view?usp=drive_link

Thank you for your support!

[Hakon]

I'm quite sure that this is not supported on the nRF9160, as read only position independent code is not supported on any Nordic devices.

[Sunny_1982]

Hi there, Thank you for your response!

Are you 100% sure that nRF9160 does not support LLExt?? The reason I am asking is that I hear different answers from other opensource community LLExt support is very much there in nRF9160. Please refer to the Github ticket, they mentioned that LLExt support is there in the platform. Can you please re verify and confirm the LLExt support.  
https://github.com/zephyrproject-rtos/zephyr/issues/80170

Thank you for your support.