Please find my reply in bold below to your questions.
1: Do you want use Cortex-M or Cortex-A STM32s?
We want to try both kits. For small application, we want to start with Cortex-M with 7 inch kit inititally.
2: Do you want to use RTOS or Embedded linux?
Rtos is preferred because in past we have tried some hardwares and failed due to GUI getting hanged and not responding. By uaing Rtos we want to make sure that OS part is perfect.
3: Would both resolution 800*480 and 1024*600 be relevant? and is there a specific display size you need?
7 inch screen size for 800*480 and 10 inch screen size for 1024*600(10 inch will be in second phase once we finish cortex M evaluation)
4: Is it a possibility to use product ready display modules?
There are modules from SOMLABS with STM32MP157, Riverdi and EDT with STM32H7s.
Ready to use would be first priority so that we can focus on application. If we also want to change touchscreen then it should be possible but not mandatory. EDT kits are interesting but i need more details to understand features and pricing.
5: Which GUI frameworks is preferred?
Since we are starting from Scratch we can adapt and use any framework which is supported by STM.
