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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


Re: Re: SW4STM32 or CubeMX to init STM32 device

64 bit apps can use all of a systems memory. I have 8GB, so that means eclipse is able to run above 4GB, which can be more efficient on my system at times.
32 bit apps are stuck to the lower 4GB and as this space becomes crowded, Windows/OS X will start swapping and this leads to slower performance. I usually have some other 32 bit apps running on the system, so crowding can be an issue.
As the OS is 64 bits, that means that it lives in the upper regions of the 8GB space, thus not competing for memory space with apps. FWIW, when bit 63 is set, the system is working in Windows.