tftp timeouts in 1.4.1

[Alexander Kriegisch]

> That's why there is a small set of post-1.4.1 fixes on busybox.net:
> http://busybox.net/downloads/fixes-1.4.1/
> In particular, busybox-1.4.1-tftp.patch

Sorry for the inconvenience of having you point me to that patch. I
applied it and tftp behaves differently now, but it is still broken.
New symptoms:
  - File transfers up to 512 bytes are handled correctly.
  - Files bigger than 512 bytes result in the first 512 bytes
    transferred, but then there are timeouts again. After Ctrl-C or
    after the last timeout I have a 512 bytes file which is inaccessible
    on my Windows box. I cannot even delete it, until I changed ACLs so
    I have the rights to do so.
  - Using '-b 1024', for example, gets me a 571 bytes file showing the
    *end* of the file to be transferred, not the beginning. Very strange
    indeed.
  - Using '-b 4096' gets me a 0 bytes file which is inaccessible again.

Does that make any sense? I am attaching new strace logs of sessions
with different '-b' sizes (default, 1024, 4096). Tell me if you need
anything else.
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