• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 101 subscribers
  • Views 183 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SK-AM68: Unable to get any output from the board via USB or HDMI

Richard Haar
Prodigy 85 points
Part Number: SK-AM68

I have an SK-AM68 Starter kit which I am trying to connect to via the provided USB Cable (Type-A to Micro-B) but I am not able to get any output so far.

I am using a POWERPAX USB-C 72W device which I have read supports USB-C Power Delivery which should be capable of outputting 20V at 3A. And I have read in the starter guide that the USB Type C connection has Power Delivery 3.0 support. I am using a USB-C to USB-C cable rated at 100W. So I believe there should be enough power to the board.

And I have connected the Micro-B USB cable in J4 on the board and then into my host PC.

The power LED (LD2) has lit up red, and so has the UART-over-USB LED (LD1).

After connecting the USB I get four devices: /dev/ttyUSB0  /dev/ttyUSB1  /dev/ttyUSB2  /dev/ttyUSB3

I have downloaded the tisdk-edgeai-image-j721s2-evm.wic.xz image and placed it onto the sd card after extracting it and using BalenaEtcher. You can see the contents here:

'System Volume Information'     tispl.bin              uEnv.txt.base
 tiboot3.bin                    u-boot.img             version
 tiboot3-j721s2-gp-evm.bin      uEnv_edgeai-apps.txt
 tiboot3-j721s2-hs-fs-evm.bin   uEnv.txt

I have inserted the SD card and I have ensured the boot pins are set to all OFF so it should boot from SD card.

I connect with picocom to /dev/ttyUSB2 with a baud rate of 115200 and i turn the board on and off again and I get no output at all in my terminal. And I cannot input anything as if it was stuck on the uboot shell.

I have also tried to see if there was any output from the HDMI port but I don't get any image when I do that.

Things I have tried:

- Using mksdboot.sh from the ti-processor-sdk-linux to create another sd card rather than the supplied one.

- I have connected the board via Ethernet to my host PC and used wireshark to check any transmissions from the board and there seems to be packets coming from the device.

- I have tried using Tera Term on windows after installing the listed required driver to connect to all four COM ports with baud rate 115200 and again no output.

- Using other programs e.g. minicom over picocom,

- Showing output from all /dev/ttyUSB* devices

- Using a different micro USB cable

- Trying to power through a usb-c cable from my host pc to the board

I have tried connecting on host Pc of Ubuntu 22.04 and Windows 10.

My experience is mostly with software rather than hardware but from my use of theTMDSEVM572x board I should be getting some boot log output. I am a little unsure on what to try next or if I have missed something fundamental.

Any advice on what to try next would be appreciated

  • +1
    Prodigy 85 points

    It turns out I re ran Balena Etcher on the tisdk-edgeai-image-j721s2-evm.wic image on Ubuntu 22.04 (previously I ran Balena Etcher on Windows) and a different SD card reader and I was able to boot up the board just fine with both serial and HDMI output.

    The contents of the SD card's boot partition being slightly different:

    tiboot3.bin                tiboot3-j721s2-hs-fs-evm.bin  u-boot.img
tiboot3-j721s2-gp-evm.bin  tispl.bin                     uEnv.txt