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AM4372: OTP key writer: possible to change default UART?

Robbe Vancayseele
Prodigy 10 points
Part Number: AM4372

Hi,

We're using the AM4372 HS processor and burning our SMEK and SMPK-H using the OTP Key Provisioning Tool. This is working fine in our development environment, using UART0 for debug access. But for production, we would like to use a different UART to monitor the key provisioning (UART0 is not connected on the production test jig). Is this possible? We don't have the sources for the tool and selecting the UART is not one of the configuration options you provide, but it should be a fairly simple change, no?

Kind regards,

Robbe

  • 0
    TI__Genius 12330 points

    Dear Robbe,

    Thanks for your query, we are looking into the issue and get back with the solution soon.

    Regards

    Anshu

  • 0 in reply to Anshu Choudhary
    TI__Guru 68960 points

    Hi Robbe.
    In short, UART0 is the only UART port supported in AM43xx OTP keying tool, and some rationales are listed below.
    - OTP keying tool is an extension to onchip bootrom. The sole purpose of OTP keying tool is programming customer key set so OTP keying tool is made
    simple and has less dependency on user's own board design. One of design decisions was selecting UART0, where UART configuration is by bootrom, not OTP keying tool.
    - Also UART0 is the only UART port, where PINMUX re-configuration is not required, i.e. balls K25/J24 are fixed for uart0_rxd and uar0_txd.
    Best,
    -Hong

  • 0 in reply to Hong Guan64
    Prodigy 10 points

    Hi Hong,

    Thank you for your quick and clear response. We will look for other ways to make this work in our production setup.

    Kind regards,

    Robbe