Turn off the Uart1 used in TF-M

[Tide]

Hi,

We need to use Uart1 in our application No-secure program, how can I turn off the Uart1 used in TF-M ? When I add

CONFIG_TFM_LOG_LEVEL_SILENCE=y

directly in the prj.conf of the app, I get the following compilation error:

../arm-zephyr-eabi/lib/thumb/v8-m.main/nofp\libnosys.a(sbrk.o): in function `_sbrk':
sbrk.c:(.text._sbrk+0x1c): undefined reference to `end'
collect2.exe: error: ld returned 1 exit status

.

Please help.

[Sigurd Hellesvik]

Hi,

Which version of the SDK do you use?

Can you see tjos of ypi add the configuration to the zephyr/samples/hello_world example as well?

Regards,
Sigurd Hellesvik

[Tide]

Hi,

My sdk version is v2.4.0.

I refer to this ticket : "">devzone.nordicsemi.com/.../undefined-reference-to-end-with-nrf-connect-sdk-v2-4-0" and add 

CONFIG_ DEBUG=y

 then the compilation error disappeared. But the code size of tf-m increased by 15K.Is there any other way to solve the above compilation error? 

[Sigurd Hellesvik]

Do you see the issue if you add CONFIG_TFM_LOG_LEVEL_SILENCE=y to the zephyr/samples/hello_world example as well?

[Tide]

Just adding CONFIG_TFM_LOG_LEVEL_SILENCE=y to zephyr/samples/hello_world example, the hello_world app compiles fine. But adding other configurations used in my app (e.g. CONFIG_TFM_PROFILE_TYPE_MEDIUM=y
CONFIG_NRF_SECURITY=y), the problem occurs. I just want to disable Uart1 used in TF-M, is there any other way than adding CONFIG_TFM_LOG_LEVEL_SILENCE=y ?

[Sigurd Hellesvik]

We are able to reproduce this and are looking into it as a potential bug

[Sigurd Hellesvik]

See https://github.com/nrfconnect/sdk-nrf/pull/11886 for a fix to this.

It should be possible to apply this patch to v2.4.0