Hi guys,

I am new to the list and also to mbedTLS. Now I am trying to port mbedTLS to chibiOS. And when I called altcp_tls_create_config_client(cert, sizeof(cert)), I got a link error like following:

c:/chibistudio/tools/gnu tools arm embedded/7.0 2017q4/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/lib/thumb/v7e-m\libg.a(lib_a-sbrkr.o): In function `_sbrk_r':
sbrkr.c:(.text._sbrk_r+0xc): undefined reference to `_sbrk'

And these are my settings:

#define MBEDTLS_PLATFORM_C
#define MBEDTLS_PLATFORM_MEMORY
#define MBEDTLS_PLATFORM_CALLOC_MACRO chHeapAlloc
#define MBEDTLS_PLATFORM_FREE_MACRO chHeapFree

where chHeapAlloc and chHeapFree are the memory allocation functions from chibios.

(1) Did I miss some settings? or i did something wrong?

(2) I did not find much information about the porting from chibios side. Does anybody know where I can look for reference projects/docs?

Any suggestion will be appreciated. Thanks.

Songwei