Patch for tftp client code

[Eric Doenges]

Andrew Lunn wrote:

[ ... ]

> Did you test just the normal case or the error case as well? Its a bit
> unusual. UDP is allowed to deliver out of sequence packets, but it
> does not often happen. What sort of network setup do you have to make
> this happen? Im wondering if your ethernet driver is broken. If so it
> will affect you TCP performance.

Actually, the pakets I receive are not really "out of sequence"; instead 
it seems that some pakets are sent twice. I would guess this happens
when the tftp client is slower than usual sending an acknowledge for a
DATA paket, causing the server to think the paket got lost and resending
it. Since my target is connected to our network via a hub and the
ethernet performance isn't that hot to begin with (nc_test reported a 
maximum throughput of around 1.8 MByte/s, if I remember correctly), this
doesn't seem so unlikely to me. Using tftp under Linux on the same
hardware is only marginally faster, so I don't think this is an
indication of driver problems.
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