SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32

generating position independent code problem on STM32F4


Hi Sylvain,

As I said in my previous post, BL is ALWAYS using relative addressing; to use absolute adressing you would have to use code like this:
LD R12,=test_function
where the first instruction will in turn be displayed in disassembly as two instruction: a MOVW #xxxx to load the 16 lsb (setting the msb to 0) and a MOVT #xxxx to load the 16 msb

Thus the code you show is indeed using relative addressing, so is perfectly valid in PIC mode.

Bernard (Ac6)