The bootloader, one of the key software components included in the BSP, completes the required hardware initialization to run operating system images. The boot mode determines the location of the primary bootloader and is selected from the S1 dipswitch on the underside of the Carrier Board.
The Boot Switch S1 should only be modified with the i.MX7 completely powered off and disconnected from a power supply.
Set the S1 dipswitch correspondingly:
SD/MMC Boot Jumper Configuration
|J8||1+2 (Default)||Select to boot via normal speed SD/MMC|
|2+3||Select to boot via high speed SD/MMC|
NAND Boot Jumper Configuration
|J21||1+2||Select 128 pages per block when booting from NAND|
|Select 64 pages in block when booting from NAND|
QSPI NOR Flash