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IWR6843AOP: Device skips SBL and boots into application

John Smith
Prodigy 50 points
Part Number: IWR6843AOP

Hi,

I'm running a slightly modified version of the SBL and mmWave demo application. When I download the SBL to meta image 1 and the application to meta image 4, the device boots immediately into the application, seeming to entirely skip the SBL (I see no output from the SBL, only from the application).

I have a similar setup for the xWR1843 which works as expected, booting first into the SBL then auto-booting into the application.

I expect that the boot ROM loads meta image 1 regardless of what it contains, so how could the SBL be skipped? I'd appreciate any tips on how to further debug this.

Thanks.

  • 0
    TI__Genius 17265 points

    Hi,

    Can you try this with the existing SBL quickly? I suspect that there may be an issue with the image you are loading into metaimage 1, and the bootloader is detecting the issue and considering it an invalid image, then skipping to the next valid image. By testing with the existing SBL, we can try to verify this behavior.

    Best Regards,
    Alec

  • 0 in reply to Alec May
    Prodigy 50 points

    Hi,

    I've loaded the unmodified SBL and I get the same issue. Tested on two different devices as well.

    Thanks.

  • 0 in reply to John Smith
    TI__Genius 17265 points

    Hi,

    Understood, that is certainly unexpected behavior. Just to confirm, you used the prebuilt binary for the SBL from the mmWave SDK? Additionally, could you confirm which version of the SDK you are using? 

    Best Regards,
    Alec

  • 0 in reply to Alec May
    Prodigy 50 points

    Hi,

    Yes, it's the prebuilt binary (xwr68xx_sbl.bin) from version 03.05.00.04.

    The prebuilt SBL works if I don't flash the application image for some reason.

    However, when I flash my modified SBL without the application image, it doesn't work.

    Edit: I can get my version of the SBL to run if I use the makefiles instead of my CCS project, but it still skips the SBL if I add the application image.

    Thanks.