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 two short videos (registration required) highlighting:

System Workbench for STM32

Incorrect binary size after compilation.

Hi, seems like the linker file is ok, and since the .elf is ok so that means that there is no issues with the linker file, so i will recommend you to generate the hex file as follows:
arm-none-eabi-objcopy -O ihex {yourelfname}.elf “{binaryname}.hex”
that command will generate a hex file based on the .elf that is alerady working