Please create a bareboard project for P2020DS, then modify Toolchain configuration from Project->Properties->C/C++ Build->Toolchain Editor.
Please configure Current toolchain as: PowerPC EABI e500v2 C Toolchain Release.
Current builder as: PowerPC EABI e500v2 Release Builder
There is no template for P2020 GCC toolchain, you could create a bareboard project for P4080DS to do reference.