[U-Boot] IP_t should be a "packed" struct

[Luigi 'Comio' Mantellini <luigi.mantellini.ml@gmail.com>]

Hi ML,

I'm working on a mips target and I used qemu_mips target to simulate my target 
(that I hope to have in the next week...)

Following my activities I noticed that IP_t structure is no defined with 
attribute "packed". I noticed this issue because using a self-made toolchain 
(gcc4.2.4+binutils2.8+uclibc0.9.30) the compiler has aligned all bytes to 
32bit boundary. This is not ok, because the packets IP_t can be non aligned 
(see the /net/net.c PingSend function, for an example).

The dirty solution is to define the structure with the 
__attribute__((__packed__))... but, from my point of view, a better packet 
forging mechanism should be implemented into the net.c stack.

I attached a trivial patch that solved the issue on my target.

Any comments is welcome.

best regards,

luigi

-- 
Luigi Mantellini
R&D - Software
Industrie Dial Face S.p.A.
Via Canzo, 4
20068 Peschiera Borromeo (MI), Italy
Tel.:  +39 02 5167 2813
Fax:   +39 02 5167 2459
Email: luigi.mantellini at idf-hit.com

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