Resolved! OpenAMP_FreeRTOS example vs Cube Project - Why is the Cube project putting the init for IPCC and OpenAMP is the else section of the Is_Engineering_Boot_Mode() if statement?
I created a project using CUBEIDE for STM32MP157C-DK2 and set all peripherals to initialize. I enabled FreeRTOS and then started porting over the example code in in the Projects folder for the OpenAMP_FreeRTOS_echo application. It is all compiling ...