Posts by YL3DW

    I met the same problem after firmware updating, but in my case everything is more complicated . As described above, I tried to switch the device to the DFU mode, LED's show me that the device is in DFU mode (LED1 is constantly ON), but windows device manager still says "Unknown USB device(Device descriptor request failed)", and of course I did not find the device on the network. Using USB-COM adapter i connected to JTAGUART and saw the following:

    U-Boot PlutoSDR v0.20-PlutoSDR-00053-g89d0754 (May 28 2019 - 19:24:22 -0700)


    I2C: ready

    DRAM: ECC disabled 512 MiB

    SF: Detected N25Q256A with page size 256 Bytes, erase size 4 KiB, total 32 MiB

    In: serial@e0001000

    Out: serial@e0001000

    Err: serial@e0001000

    Model: Zynq Pluto SDR Board

    Hit any key to stop autoboot: 0

    Unknown command 'bootp' - try 'help'

    Wrong Image Format for bootm command

    ERROR: can't get kernel image!

    Pluto>


    I tried to find out what was wrong with the USB port, I got the following:

    Pluto> usb info

    USB is stopped. Please issue 'usb start' first.

    Pluto> usb start

    starting USB...

    USB0: ULPI request timed out

    zynq ULPI viewport init failed

    lowlevel init failed

    USB1: usb1 wrong num MIO: 0, Index 1

    lowlevel init failed

    USB error: all controllers failed lowlevel init

    Pluto>


    I don't think the port has burned out. I think I made a mistake when updating firmware. How can I restore firmware using JTAGUART?