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u-boot prompt not appearing

Ashwini Deshpande1
Intellectual 605 points
Other Parts Discussed in Thread: OMAP3530

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Hi Experts,

 

In our OMAP3530 custom board, u-boot is getting downloaded properly into SDRAM via uart3 but at uart1 console prompt is appearing.

But it shows autoboot countdown time till zero and not taking interrupt from keyboard.

 Can anyone suggest me what’s wrong is happening and how to overcome.

 Thanks and Regards,

Ashwini

  • 0
    TI__Mastermind 41665 points

    Ashwini Deshpande said:
    But it shows autoboot countdown time till zero and not taking interrupt from keyboard.

    Since you can see the countdown, it shows that the U-Boot is working, and that the UART transmitter is working on the board, so it is likely very close to working. The first thing that comes to mind for the serial terminal not responding in this case would be that there is some problem in the electrical connection of the receive UART signal on the OMAP3, in other words there could be a bad UART cable, a loose connection on the PCB, or schematic error. To start I would trace down the UART1_RX signal and make sure that it is making it all the way to the UART connector and likely check it with a scope at the closest point possible to the OMAP3 to ensure you are seeing proper transitions when you send something from the host's serial terminal.

  • 0 in reply to Bernie Thompson TI
    Intellectual 605 points

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    Thanks for suggestion , there was problem with cable. Now it is working fine.

    -- Ashwini