This is essentially the same question you have already asked here.
The STM32MP1 as a CPU is perfectly designed to work with external flash and external RAM, whereas with the same structure you don't really use the full potential of the Cortex-M. Microcontrollers with Cortex-M cores are optimised for maximum processing speed using internal memory.
For your purposes, you could look at one of the many DISCOVERY boards, e.g. the STM32H745I-DISCO, whose design still needs to be adapted to your needs (WVGA, much more memory).
Does it answer your question?
Regards
/Peter
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