The bootloader, one of the key software components included in the BSP, completes the required hardware initialization to download and run operating system images. The boot mode determines the location of the primary bootloader and is selected from the S5 dipswitch on the Carrier Board.

Set the S5 dipswitch correspondingly:

SD Card

eMMC

NAND

Before changing boot switches, please power the board off. 

For more information regarding the changing of Boot Modes, see Change Boot Configuration.