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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


Can't program/debug STM32F746ZGT6 from System Workbench

More, if it helps:
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GNU gdb (GNU Tools for ARM Embedded Processors) 7.8.0.20150304-cvs
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type “show copying”
and “show warranty” for details.
This GDB was configured as “host=i686-w64-mingw32 target=arm-none-eabi”.
Type “show configuration” for configuration details.
For bug reporting instructions, please see:
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Find the GDB manual and other documentation resources online at:
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For help, type “help”.
Type “apropos word” to search for commands related to “word”.

show configuration
This GDB was configured as follows:
configure host=i686-w64-mingw32 target=arm-none-eabi
--with-auto-load-dir=$debugdir:$datadir/auto-load
--with-auto-load-safe-path=$debugdir:$datadir/auto-load
--with-expat
--with-gdb-datadir=/home/build/work/GCC-4-9-build/install-mingw/arm-none-eabi/share/gdb (relocatable)
--with-jit-reader-dir=/home/build/work/GCC-4-9-build/install-mingw/lib/gdb (relocatable)
--without-libunwind-ia64
--without-lzma
--without-guile
--with-separate-debug-dir=/home/build/work/GCC-4-9-build/install-mingw/lib/debug (relocatable)
--with-system-gdbinit=/home/build/work/GCC-4-9-build/install-mingw/i686-w64-mingw32/arm-none-eabi/lib/gdbinit (relocatable)
--with-zlib
--without-babeltrace

(“Relocatable” means the directory can be moved with the GDB installation tree, and GDB will still find it.)