SC573 security problem

SC573 security problem

I set public and private key in OTP memory using API functions. Then lock the device with function 'adi_rom_lock'. All functions returned 'true'. Then I reset the device. But device is OPEN. I can load unsecure programs to it and read OTP. I try to read lockbit in OTP memory location 0x48C: it is '1'. 

I repeat this procedure at another chip with the same result. The chip revision is 0.0.

The same procedure on Blackfin BF707 (it has the same security system) lock the part without any problem.

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  • 0
    •  Analog Employees 
    on Jul 29, 2021 10:55 AM in reply to hxz

    Hi,

    We are closing this thread here since the patch was provided via private support.

    For others to benefit, if the ADSP-2156x family of processor is not getting locked even after programming the security lock bit, this could be due to the fact that security lock bit feature is not enabled on certain engineering samples (ENG). Production parts do not exhibit this issue.


    This can be resolved using a patch which will enable you to program the component via JTAG connection.


    Please contact processor.support@analog.com to get this patch.

    Regards,
    Anand Selvaraj.

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