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AM263P4: Questions after reading AM263PX OTP Keywriter User Guide

Jeeuk Chang
Intellectual 290 points

Part Number: AM263P4
Other Parts Discussed in Thread: UNIFLASH

Hi, Ti experts.

I'm reading the Keywriter User Guide to make my AM263Px board into HS-SE status.

(Keywriter version is "am263px_SR_10_11_00_00_02".)

-----

(1) What is MSV (Model Specific Value)?

In the guide, the MSV is 0x1E22D. Is this fixed value for AM263P4?

Or can the user select any value between 0x0~0xFFFFFF ?

What role does this value play in security?

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(2) At sequence of OSPI boot of keywriter, the guide use prebuilt sbl_uart_uniflash.

Then why do I comfile sbl_uart_uniflash like below?

make -s -C examples/drivers/boot/sbl_uart_uniflash/am263px-cc/r5fss0-0_nortos/ti-arm-clang all

-----

Regard,

Jeeuk Chang

 

  • +1
    TI__Guru* 89261 points

    Hi Jeeuk Chang

    Jeeuk Chang said:

    What is MSV (Model Specific Value)?

    In the guide, the MSV is 0x1E22D. Is this fixed value for AM263P4?

    Or can the user select any value between 0x0~0xFFFFFF ?

    What role does this value play in security?

    MSV is purely customer usage value. The TI ROM or HSM does not do anything with this. This could be used by customer to differentiate their ECU using any model number values

    Jeeuk Chang said:

    Then why do I comfile sbl_uart_uniflash like below?

    make -s -C examples/drivers/boot/sbl_uart_uniflash/am263px-cc/r5fss0-0_nortos/ti-arm-clang all

    Yes, there is a prebuilt version of sbl_uart_uniflash that is available in SDK. You can use that directly. 
    The above command is to build the same binary using the source code of the sbl_uart_uniflash project.

    Thanks and Regards,

    Nikhil Dasan

  • 0 in reply to Nikhil Dasan
    Intellectual 290 points

    Hi, Nikhil Dasan.

    Now I can determine all keywriter certificate values.

    Regards,

    Jeeuk Chang

  • 0 in reply to Jeeuk Chang
    TI__Guru* 89261 points

    Sure, Thank you