[ECOS] Network layer

[Samuel Tardieu]

By the way, has anyone ported one of the free IP stack to eCos? (BSD, Linux,
...) In ENST, we have taken the BSD stack ported to RTEMS and adapted it to
eCos, and it looks like it is doing pretty well on our PPC board (MPC860).
But if someone already has one, I'd be happy to trash our dirty and fast port
to use another. Otherwise, we will contribute it to eCos in the future when
the code gets cleaned up.

  Sam