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SK-TDA4VM: Unable to connect to Serial Console

Deepankar maithani
Intellectual 336 points
Part Number: SK-TDA4VM
Other Parts Discussed in Thread: TDA4VM

I have a J721EXSKG01EVM — TDA4VM Edge AI starter kit. I flashed the linuxsdk using Balena Etcher and can see the Wallpaper on the screen. It comes and goes. Then i connected the  microUSB cable to my laptop.  When i do dmsg | grep tty. I get 4 USB ports. I tried to connect to all  of them using miniterm and putty. But i never get the login prompt. It just stays there. Gives no errors nothing. The baud rate is 15200. Also the red LED just next to the micro USB port is turned on.

What could be the issue?

  • 0
    TI__Guru 51753 points

    Hi Deepankar,

    Could you make sure the serial connection is set with baud rate is 115200 instead of 15200, and furthermore, configure for 8 data bits, 1 stop bits, no parity bits, and no flow control?

    Regards,

    Takuma

  • 0 in reply to Takuma Fujiwara
    Intellectual 336 points

    Sorry that was a typo. I am actually trying with 115200.  I have the same settings as you have mentioned. I am using putty. The red LED next to micro USB connection turns on when i connect and stays on. But no prompt comes  up. Only black screen. Also I know that the board has booted because i can see the  wallpaper. The Laptop also detects the Serial console. I am on windows 10 and device manager looks like below

  • 0 in reply to Deepankar maithani
    TI__Guru 51753 points

    Hi Deepankar,

    It seems like all the steps are followed, so it is strange that nothing prints out on the serial ports.

    Could you do the following:

    1. Power off the board
    2. Make sure all BOOT CTL DIP switches are in off position (it should all be off by default out-of-box)
    3. Connect all 4 serial ports (COM9, COM11, COM12, COM10) using TeraTerm, making sure that each has the correct serial settings shared in my previous post
    4. Turn on the board

    The third serial port should print out some boot logs.

    Regards,

    Takuma

  • 0 in reply to Takuma Fujiwara
    Intellectual 336 points

    Yes I can conform. The serial works reliably now.  Earlier i was first booting the device . And once  i see the wallpaper i was then was trying to connect to it over serial. This had issues that no matter what i do i couldnot reach the prompt. But now following the steps you mentioned i have the serial connection .