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AM6548: Secure boot

Part Number: AM6548

I have a AM65x EVM board. I want to develop secure boot by optee. i have some questions following :

1. how about the develop steps for secure boot feature in this board ?

2. how to write key in eFuse ?

3. how to write key in development status, you know the eFuse just can write one time, but I will write many times key in development status

4. secure boot is singed the firmware or encrypt firmware ?