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.