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Zedboard ..linux would'nt boot

Former Member

I powered my new zedboard. made the necessary jumper connection to boot from the SD card. LD12, LD13 and the Display are all turned ON. Configured tera term session as per the documentation. When I turn on and off the board, the linux would'nt boot as mentioned. When I disconnect from the terminal and reconnect back and press <enter>, I get the zync> prompt. I can do ls and read the directories present. So, the connection exixts but for some reason it would not load the linux boot image. Please help.

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    If you are getting the zynq> prompt then Linux did boot successfully. It sounds like you had issues with the USB-UART connection to your Tera Term session such that you just missed the boot up display.

     

    It may be the Cypress UART-USB driver that is causing the problem. Originally the Cypress driver had a 'persistent mode' such that even though you powered down the ZedBoard it kept the connection to TerraTerm or Putty active and it would reconnect when you powered the board up again. This also helped for those applications that booted quickly and output to the terminal before you could set up TerraTerm or Putty. Then, at some point Cypress changed the driver to remove the persistent mode so that if you downloaded the driver later or if it was updated the persistent mode was lost.
     
    We have worked with Cypress and they have posted a new version of the driver that includes persistent mode again. If you check and your current driver is up to date you may just need to enable the persist mode as shown starting with step 7 below. We will be updating the ZedBoard documentation but I will outline the steps to get the new driver here for now:
     
    1. Connect the evaluation board’s Cypress UART-USB interface to the PC.
    2. Browse to the website: https://secure.cypress.com/?mpn=CY7C64225-28PVXC
    3. Scroll down to Technical Documents and download the "Microsoft Certified USB UART Driver" for your PC’s operating system. You should see a driver that was updated 25/11/2013.
    4. Download the driver and unzip the file.
    5. Unplug your USB UART device and then run "Setup.exe".
    6. Once the installation is done connect the USB UART back.
    To configure the persistent mode:
    7. Open up Windows Device Manager and make sure the device manger view is in "Device by Type" (Device Manager: View > "Device by type:)
    8. Locate the device type node called "Ports (COM & LPT)". Under this node locate "USB Serial Port (COM xx)". Double click on this device node. Under the "port settings" tab click the "Advanced" button.
    9. In the new pop up window check the "Enable Port Persist" box. Click OK and close property windows.
    10. Next serial port open operation should have the port persistence property enabled.
     
    -Gary