3 Boot Sequence

The ROM code uses a Boot Configuration Word (BCW) that is stored either in the Fuse area or in the backup register BUREGx for various configurations.

Out of factory, the ROM code uses a default boot configuration and tries to boot from the following external memories:

SD Card/e.MMC (SDMMC0)
SD Card/e.MMC (SDMMC1)

If no bootable file is found in any of these memories, the ROM code runs the SAM-BA Monitor and waits for the user’s commands.

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