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Original question:

AM62P: TTL-RGB8888 LCD Interfacing

AM62P: The AM62P EVK resets without an HDMI cable connected.

Jack
Mastermind 9145 points
Part Number: AM62P

Tool/software:

Hello AM62P Champ !

My customer is bringing up a custom board, and the SK EVM shows the same symptoms: without an HDMI cable connected, the board continuously resets, making it impossible to proceed with development for projects that don't use HDMI.

Please tell me how to prevent the board from resetting when HDMI is not connected. Is it sufficient to just disable the HDMI-related parts in the Device Tree? If there are any relevant settings, such as for a bridge IC, please provide instructions on how to configure the board to not reset without using HDMI.

Thanks,

Best Regards, 

Jack

  • 0
    TI__Expert 8300 points

    SK-AM62P does not need to have a HDMI connected to boot.
    At what point of logs in UART console does it reboot? Most likely the power supply you are giving is not sufficient.

  • 0 in reply to Divyansh Mittal
    Mastermind 9145 points

    Hi Divyansh

    The issue has been reconfirmed with the customer. The device doesn't reset but faults out when the HDMI connector is not attached, and the console and ADB stop working. Can we boot successfully without HDMI? Our custom board removes the HDMI port and supports a 24-bit RGB parallel interface (DPI) instead.

    Customer Question:

    Can we successfully boot without connecting an HDMI cable? We've designed a custom board where the HDMI port has been removed and we intend to support DPI (24-bit RGB parallel interface) mode.

    Regards, 

    Jack

  • 0 in reply to Jack
    TI__Expert 8300 points

    Hi Jack,
    Yes, you can boot without without connecting HDMI cable, and we have done so countless number of times.
    Is this issue seen only on custom board or TI EVM as well?
    We have absolute zero reports internally as well as externally for such issue and we cannot see this issue on TI EVM on our end.
    You may probably try out with another EVM sample.

    Also, for your custom board, since you are using only DPI, I am hoping you have removed HDMI bridge (sii902x) related nodes from the dts.