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DRA829V: PCB design secure boot

Kenley
Intellectual 1000 points
Part Number: DRA829V
Other Parts Discussed in Thread: DRA829, AM5706

Hi team,

My customer is designing a PCB with secure boot that implements the DRA829 High-Security device and supports OTP eFuse programming.

This question is to confirm the circuit that should be implemented as hardware.

Please refer to the following for the circuit diagram image from customer.

They would like to check whether it is enough or not. Please let me know what features are missing.

Explanation:

1. It must be possible to boot from MCU_UART0 or WKUP_UART0 with the pin setting of "UART Primary Boot Mode" or "UART Backup Boot Mode".

At that time, a UART-USB conversion circuit is required in consideration of connecting to a personal computer.

2. Prepare a 1.8V LDO that can be controlled ON/OFF by GPIO9 of TPS65941111-Q1 as the power supply for VPP_CORE and VPP_MCU of DRA829.

They have also adopted the AM5706, what do you think of this?

  • 0
    TI__Mastermind 42870 points

    1.  It should not be an issue using UART-USB devices for communicating with PC for UART booting.  Our EVMs do very similar.  The UART boot mode is enabled by setting of the bootmode.(either primary or secondary).

    2.  I think it is typically recommended to have GPIO for controlling VPP power supply a processor IO and not a PMIC IO.  Updates made to the eFuse flashing tool are simpler if only updating GPIO vs writing to PMIC registers.

    Not clear on relationship to AM5706, please clarify.