dfu-util capability

[ubootmaillist at burrellhome.com]

I have a system that has a CPU running u-boot and have a Xilinx Zynq 
connected via USB using DFU to download the FPGA image.  I can 
successfully download the FPGA image via dfu-util from the linux OS.    
I would like to be able to load that same image from u-boot prior to 
loading the OS.

 From what I can tell, the DFU capability in u-boot is a host stack that 
sits on the USB subsystem and acts a host for a memory style device that 
may or may not have a filesystem.   This is not quite what I need.

What I want to do is take a file from a device that has a filesystem 
(mmc for example) and provide a DFU transfer to the DFU capable host on 
the FPGA.   Think of it as porting dfu-util to u-boot.

Is there a way of doing this in the current u-boot state or will I need 
to write a new command to do this?    Has someone already done this?   
Doing serveral web searches, I am not sure that it has this capability 
or if it does, how to configure it correctly.

Thanks in advance for the help.
Paul