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u-boot messages on Starter Kit hardware

Ed Slas
Prodigy 20 points

I would like to see the u-boot messages, stop in u-boot and modify env variables.

Since the Am335x starter kit has a USB-Serial adapter rather then a direct connection to the uart, no messages are printed out until linux has started.

Anyone know how I can stop the Starter Kit hardware in u-boot with a console?

  • 0
    TI__Mastermind 18130 points

    Hi Ed,

    Once your Linux host has established the serial connection it will retain it until you unplug the cable or power cycle the device. A Reset shouldn't disable the ttyUSB* devices.

    If you want to get into U-Boot you should be able to just reset the board and pause it as you normally would. Are you having issues getting this to work?

  • 0 in reply to TimHarron
    Prodigy 20 points

    Tim,

    Thanks for the quick response.

    First off I am using winXP/TeraTerm for the console. I have device manager up showing the virtual console.

    Where I went astray was not knowing that there was a reset button. (Documentation?) I was trying the power button and the COM port would go away. I tried removing the SD card (not knowing u-boot was there), and all I would get is "CCCCCCCCC" every 10 sec or so.

    The reset button is right next to the power input jack on the bottom of the board. I powered up the board, established my serial port, then hit reset. The u-boot messages were then displayed and I could interrupt the boot.

    Thanks for your help.

  • 0 in reply to Ed Slas
    TI__Mastermind 18130 points

    Ed,

    On the documentation front I think you may want to start here. The Quick Start Guide has a couple pictures labelling the buttons and other components.