Can anyone please provide me the answer of the below questions..

1.Does QNX support oading OS image from eMMC4.4 to SDRAM (We will use the U-boot to load OS image. U-Boot is loaded by 
IPL or IPL include U-boot.)?

2.The image to load can be switched by key operation, parameters in NVM or parameters in internal RAM?

3.Does QNX supports secure boot?

4.Is the QNX boot function can be switched by GPIO status or internal register?