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Connect the USB to the board before launching SAM-BA

• Open the JP8 to prevents booting from NAND Flash by disabling Flash Chip Selects
• Connect a USB micro-A cable to the board (J4 USB-A). It powers the board
• check whether the board is found in your PC as a USB device:
  • For Microsoft Windows users: verify that the USB connection is well established
    AT91 USB to Serial Converter should appear in Device Manager. If it shows a unknown device you need to download and install the driver: AT91SAM USB CDC driver
    
  • For Linux users: check /dev/ttyACMx by monitoring the last lines of dmesg command:
    [172677.700868] usb 2-1.4.4: new full-speed USB device number 31 using ehci-pci
    [172677.792677] usb 2-1.4.4: not running at top speed; connect to a high speed hub
    [172677.793418] usb 2-1.4.4: New USB device found, idVendor=03eb, idProduct=6124
    [172677.793424] usb 2-1.4.4: New USB device strings: Mfr=0, Product=0, SerialNumber=0
    [172677.793897] cdc_acm 2-1.4.4:1.0: This device cannot do calls on its own. It is not a modem.
    [172677.793924] cdc_acm 2-1.4.4:1.0: ttyACM0: USB ACM device

    idVendor=03eb, idProduct=6124: from this message you can see it's Microchip board USB connection.

• Short the JP8 to allow access to the on-board Flash devices