I rebuild the file system and up date kernel in order to use iptable, to do theses changes i had to write in to flash.
i used iptable -A INPUT ... command line and it returned to me seg fault, i repeat the command many times and of course i received the same returned value. after that i rebooted the gumstix and nothing happened, now 95% of the times it does not start, and the others 5% it boot normally (just for 5minites ).
Someone already had this problem? I just reflash the FS and iam having problemn with boot.