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TI OTP unexpectedly programmed in F28M35H52C1 ?

Lorenzo Verniani
Intellectual 270 points
Other Parts Discussed in Thread: UNIFLASH

Hi,

I found my OTP memory partially written in all 3 sample boards i've got.

The SW on board is not able to write TI OTP nor the debugger; so i'd expect region set to 0xFFs.

Can you confirm that TI OTP range is 0x680480--0x6807FF?

Please see below the memory dump.

S32500680480FFFFFFFFFFFFFFFF61066800FFFFFFFFA1066800AD066800FFFFFFFFFFFFFFFF09
S325006804A0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF59056800D5046800DD05680091
S325006804C0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFADF1080DADF80210ADF80000B3
S325006804E016480068400825D214480068000804D31349086840F00040086012490B20086054
S32500680500BDF80000012804D10F4947F21C00086007E0BDF80000022803D10B4947F220005E
S325006805200860BDF8020009490860094809490860002001E04FF6FF7002B07047109D00504E
S325006805400C9D0050309D0050349D0050389D005001000080089D0050ADF1080DADF80210F1
S32500680560ADF8000016480068400825D214480068000804D31349086840F0004008601249C1
S3250068058009200860BDF80000012804D10F4947F21C00086007E0BDF80000022803D10B49A6
S325006805A047F220000860BDF80200094908600A4808490860002001E04FF6FF7002B0704772
S325006805C0109D00500C9D0050309D0050349D0050389D0050089D005001000080ADF1080D2B
S325006805E0ADF80000184800684008FBD216480068000804D31549086840F000400860144963
S3250068060007200860BDF80000012804D1114947F21C00086007E0BDF80000022803D10D4923
S3250068062047F2200008600C480C490860064800686FF35E000028F9D10248006880B202B07C
S325006806407047C0463C9D0050109D00500C9D0050309D0050349D005001000080089D00509C
S3250068066008B5094800900948006806280BD10849086840F480300860064800998847064999
S3250068068006480860FEE708BD7D70000134450020004000202C0868000CED00E00400FA052D
S325006806A0014800687047C04610086800014800687047C04614086800FFFFFFFFFFFFFFFFF4
S325006806C0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCC
S325006806E0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFAC
S32500680700FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF8B
S32500680720FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF6B
S32500680740FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF4B
S32500680760FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF2B
S32500680780FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0B
S325006807A0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEB
S325006807C0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFCB
S325006807E0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFAB
S70500000000FA

Thanks in advance.

Regards.

Lorenzo.

  • 0
    TI__Guru** 109125 points

    Hi Lorenzo,

    Yes, this is part of OTP and values in this area are programmed by TI as part of factory settings.  User is not suppose to change this.

    Regards,

    Vivek Singh 

  • 0 in reply to Vivek Singh
    Intellectual 270 points

    Hi again Vivek,

    so is there any OTP location in M3 or C28 that can be programmed by user?

    Thanks.

    Best regards.

    Lorenzo.

  • 0 in reply to Lorenzo Verniani
    TI__Guru* 84335 points

    Lorenzo,

    You can use the address range from 0x00680820 to 0x00680FFF in M3 OTP.  

    Below are dedicated 32-bit fields in OTP for application use:

    1. Security Lock at address 0x00680800
    2. Zone 2 Flash Start Address at address 0x0068080C
    3. Ethernet Media Access Controller (EMAC) Address 0  at address 0x00680810
    4. EMAC Address 1 at address 0x00680814

    Don't forget to program the ECC.

    And remember that you can not erase OTP.

    You should be able to program these locations using either CSS Flash Plugin/UniFlash (as part of coff file) or Flash API.

    Thanks and regards,

    Vamsi