Has anyone got a working UEFI x64 PXE boot?

Despite trying many variations the board refuses to initiate a TFTP request for the next stage boot binary (in this case x64 syslinux.efi). The board is flashed with the latest x64 firmware.
If anyone has got a working PXE boot setup with their UP board I really like to hear from them. What would be phenomenally useful is a Wireshark trace of the process.
Many thanks.
Jerry
If anyone has got a working PXE boot setup with their UP board I really like to hear from them. What would be phenomenally useful is a Wireshark trace of the process.
Many thanks.
Jerry
Comments
What image files has anyone succeeded in loading successfully over PXE? Thanks.
One thing that really helps in these situations is a serial port console. Allow you to see all kinds of early messages ...
The server with the installer image was another UP board running ubilinux.