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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


Preferred way to set Option Bytes?

Unfortunately not directly. I’ve used the ST-Link Utility to set it on my development boards.Then I’ve switched to a completely IDE-free workflow, since it didn’t really help with development.

To define the option bytes in C code, you can use a section attribute to place it in a special section, then put that section at the address of option in the linker script. I think I’ve had some problems with openocd when trying this, but I can’t remenber exactly.