The AES engine is used extensively by the RT6xx boot ROM. If the image is encrypted for recovery boot, or for setup of the OTFAD allowed XIP images to be encrypted in flash, decrypted on the fly
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AES Encryption/Decryption Using RT6xx
The AES engine is used extensively by the RT6xx boot ROM. If the image is encrypted for recovery boot, or for setup of the OTFAD allowed XIP images to be encrypted in flash, decrypted on the fly