Works with a non-multicast TFTP server (i.e. the fallback path works
fine).

Make await_tftp() static and create tftp_get() for fetching the next TFTP
packet instead.

shared between TFTP, TFTM and MTFTP protocols.

lines of code.

s_PXENV_TFTP_READ_FILE.

protocol, and how we will work around it.

Added reason for min value of 512 on s_PXENV_TFTP_OPEN::PacketSize.

the TFTP protocol.

the Etherboot implementation (i.e. don't do what Intel did).

PXE code now compiles without errors (though it won't actually work).