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TDA4VM: J721E EVM with TDA4VM SoM suddenly stopped booting from SD Card

Michelle
Prodigy 80 points
Part Number: TDA4VM


Based on issue reported at the end of this thread: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1066752/tda4vm-j721e-evm-cannot-run-run_app_single_cam-sh-demo-using-d3-imx390-ub953-camera

Basically, I reformatted my SD Card with the prebuilt SDK and inserted it into my EVM to boot it following instructions here: https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/08_00_00_12/exports/docs/psdk_rtos/docs/user_guide/out_of_box_j721e.html. However, the EVM suddenly stopped booting up (no output on the minicom console). Nothing changed except the SD card was reformatted. Power LEDs on the EVM light up, no heat dissipation felt from the SoM.

Couldn't locate SD Card boot debugging instructions on the documentation. Are there any suggestions on steps I could take to determine what could be causing this issue?

Thanks

  • 0
    TI__Expert 7235 points

    Hi Michelle,

    If I understand correctly, you have a known good SD card and one EVM boots and the other one doesn’t.

    A few things:

    - Is there any damage to the SD card cage?

    - Is the behavior the same when the Fusion board is disconnected (boot just with common processor board + SOM)

    -  On your previous post, with prebuilt binaries from SDK 8.0, the single cam demo ran fine on the first EVM as well, or just the second EVM? If just second EVM, then I'm wondering if the boot problem you are seeing now, and the CSI problem you were seeing earlier on the single cam demo on this first EVM are related. Perhaps you can try reseating the SOM. 

    One way to debug this would be to connect CCS and JTAG to see what state the SoC is in - this might give us some clues. Instructions for using CCS and JTAG are here:

    https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/08_01_00_11/exports/docs/psdk_rtos/docs/user_guide/ccs_setup_j721e.html

    Regards,

    Jelena

     

  • 0 in reply to Jelena
    Prodigy 80 points

    Hi Jelena,

    Jelena said:

    If I understand correctly, you have a known good SD card and one EVM boots and the other one doesn’t.

    Yes, that's correct.

    Jelena said:

    - Is there any damage to the SD card cage?

    Upon visual inspection, I do not see any damage to the cage

    Jelena said:

    - Is the behavior the same when the Fusion board is disconnected (boot just with common processor board + SOM)

    Yes

    Jelena said:

    -  On your previous post, with prebuilt binaries from SDK 8.0, the single cam demo ran fine on the first EVM as well, or just the second EVM? If just second EVM, then I'm wondering if the boot problem you are seeing now, and the CSI problem you were seeing earlier on the single cam demo on this first EVM are related. Perhaps you can try reseating the SOM. 

    Single cam demo only ran on the second EVM (the one that is booting up properly). The first EVM is the one that isn't booting up now and wasn't running the single_cam demo. I will try reseating the SoM.

    Jelena said:

    One way to debug this would be to connect CCS and JTAG to see what state the SoC is in - this might give us some clues. Instructions for using CCS and JTAG are here:

    Thank you! I will follow this and update the team.

    Thanks,

    Michelle

  • 0 in reply to Michelle
    Prodigy 80 points

    I reinstalled the SoM and the first EVM is booting up and running demos properly now. The first EVM only has 3 screws to secure the SoM, so I'm guessing somewhere in the process of troubleshooting the cam demos it was loosened.

    Thanks for your help!