tcp server with tftp

[Yonkee, Nathan Paul]

Hello all, I am writing some custom uboot to run a tcp server to communicate 
with our lab computer. I would like to be able to do a tftp file transfer while 
the server is connected, but when I try I get error -13. I wrote a custom tcp 
server with lwip and I am using tftp_loop() to do the tftp transfer.