What Secure Boot Modes are supported in ADSP-BF707?

Q:

What Secure Boot Modes are supported in ADSP-BF707

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A:

Three formats of Secure Booting are supported:

Formats:

1. BLp – This is when the boot stream is not encrypted but is digitally signed.
2. BLw – This is when the boot stream is encrypted and digitally signed. The key to decrypt the stream is “wrapped” and provided in the Security header.
3. BLx – This is also when the boot stream is encrypted and digitally signed. The key to decrypt the stream is stored in OTP memory a priori by the customer.

Public/Private key

1. The PRIVATE key is used to generate the signature and is held secret on the host computer.
2. The PUBLIC key is pre-programmed into the OTP by the customer and is used by the boot kernel to verify the signature thereby authenticating the boot stream