I'm running my controller with lwIP 1.4.0 and tried recently to update it to 1.4.1 but with no success. Simply copying the 1.4.1 sources lead to a non-working network stack. So I have to assume the vendor of the board support package has changed some important things directly within lwIP.
So my question: is there a patch available somewhere that can be applied to an existing 1.4.0 which adds all changes and - probably - shows me some conflicts at these positions where my lwIP variant was changed comparing to 1.4.0? http://download.savannah.gnu.org/releases/lwip/ does not contain something like that...
Comparing and merging manually seems to be impossible, nearly all files are changed, so this would be a long time task.