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Want to own the SMU coprocessor in your AMD CPU/APU/possibly GPU? Extract the firmware signing HMAC key from the bootrom? Pre-Zen only, since its based on LM32 architecture features while Zen and later switched to Xtensa cores for their SMUs.
I don’t own an Xbox One and haven’t tested there. PS4’s APU/SMU has some oddities that prevents this attack In its current form (or I’m just making a stupid mistake somewhere).
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