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The secondary bootloader primarily is responsible for updating the application metaImage in the SFLASH by receiving the image over a device peripheral. It then loads and runs the updated application meta Image. The ROM(primary) bootloader always loads the SBL. A user communicating with SBL can choose to either update OR load and run the application meta Image.
NOTE: SBL does not support secure image update.
More details can be found at SBL design