An EPK of lwip is available from http://humans.iv.ro/jani which has the mostup-to-date package (at least until it all gets integrated).It has just been tested on another ARM similar to the EB40 with CS89000and it works there too (that board has 128K of RAM).Alternatively, lw.diff is the diff against the lwip-0.5.3 tree. It containseCos support + an eCos project sample based on unixsim. Look atlwip-0.5.3/proj/ecos to see how to use it. Modify the Makefile to suityour needs and to reflect your eCos project dir.