Thanks MG,

I ended up doing the following


   - *Updating Uboot to latest version*
   - 
      
      cd /opt/scripts/tools/developers/
      sudo ./update_bootloader.sh
      sudo reboot
      - *Updating kernel to latest version*
   - 
      
      cd /opt/scripts/tools/
      git pull
      sudo ./update_kernel.sh
      sudo reboot
      - *Unblock Uboot Overlays - apparantly the eMMC can block them..*
      - sudo dd if=/dev/zero of=/dev/mmcblk1 bs=1M count=10 
      - *Updating the Overlays*
      - 
      
      sudo apt update 
      
      sudo apt install --only-upgrade bb-cape-overlays 
      
      sudo reboot 
      - *Adding in the additional capes to uEnv.txt*
      - uboot_overlay_addr4=/lib/firmware/BB-UART4-00A0.dtbo
      
I can now get access to dev/tty04 and send / receive.  I now need to work 
out why when I Open and Close the serial port and try to reopen it hangs on 
the Open command.  I have to reboot each time I try my application...  It 
works fine on dev/ttyUSB0 ftdi lead.

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