Hello,

I am trying to build TF-M v1.8 with a custom tfm_mbedcrypto_config_profile_medium.h . I mainly do not want to use a platform specific calloc /free calls, instead use standard free() and calloc(). If I disable MBEDTLS_PLATFORM_MEMORY and MBEDTLS_PLATFORM_C in tfm_mbedcrypto_config_profile_medium.h and attempt to build TF-M, I get the following error:

/arm-none-eabi/lib/thumb/v8-m.main+fp/hard/libnosys.a(sbrk.o): in function `_sbrk':

/data/jenkins/workspace/GNU-toolchain/arm-11/src/newlib-cygwin/libgloss/libnosys/sbrk.c:21: undefined reference to `end'

I’m able to build mbedtls package with both MBEDTLS_PLATFORM_MEMORY and MBEDTLS_PLATFORM_C disabled without any errors, the undefined reference error is only seen when building TF-M.

Any thoughts on how to resolve this?

Regards,
Archanaa