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CCS/TIDA-00489: Is backdoor access necessary?

Genius 4825 points

Replies: 2

Views: 32

Part Number: TIDA-00489

Tool/software: Code Composer Studio

Hey guys,

we have the TIDA-00489 design, though we have removed some stuff including J3, which was somehow related to the backdoor mode? As a starting point for software development we used the sensor software from 15.4 Stack. I recently stumbled over the backdoor pre-defined symbols and SET_CCFG_BL_CONFIG_BL_ENABLE=0xC5 was enbaled. I changed it to 0x00 to disable it. So, far I havent noticed any issues.

So my question is, if this could potentially lead to any strange behavior during flashing of the sensors in the production line?

best wishes

Slev1n

  • Hello Slev1n,  While we have received your query and forwarded it to our Building Automation Systems team, we have determined that it will be necessary to consult with our SimpleLlink product team on your firmware oriented answer.  As is such, we are currently routing your question to that team.  Please allow us an another business day to respond to your question in detail. 

    Best Regards,

    John Fullilove

    Reference Design Operations

    Texas Instruments

  • Guru 51625 points

    In reply to JohnFullilove:

    The main purpose of the CC13x2/CC26x2 ROM bootloader is to support functionality for programming a flash image into the device flash over either SPI or UART.

    The built-in bootloader start running after a power-on reset if there is no valid application image in flash

    Alternatively, the bootloader start if the so-called bootloader backdoor is enabled and the associated pin that opens the backdoor is set to the correct logic level.

    Disabling the bootloader backdoor will remove the possibility to force entry of the ROM boot loader even if a valid image is present in flash

    See https://www.ti.com/lit/swra466 for more details.

    Siri