Can I boot FreeRTOS on Raspberry PI 4

Is there a way I can Boot FreeRTOS on Raspberry PI 4 board,

If not possible, please suggest a board which I can use to boot FreeRTOS. (With GUI).

There are a few projects around, but I’m not sure how well supported they are. For example: https://www.raspberrypi.org/forums/viewtopic.php?t=41110. Regarding FreeRTOS with a GUI - you could look at boards from Renesas, or ST (who have TouchGFX), or I think also NXP with emWin.