You can get the source for ipw2100 firmware here:
http://ipw2100.sourceforge.net/firmware.php?i_agree_to_the_license=yes&f=ipw2100-fw-1.3.tgz

You can get the source for ipw2100 firmware here:
http://ipw2200.sourceforge.net/firmware.php?i_agree_to_the_license=yes&f=ipw2200-fw-3.0.tgz