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error : read only file system ....(network.conf)



hi
 
when i log in to the developer board and i will modify the file network.conf i cant save the file and i get the error : read only file-system.
but when i make a
 
ls -l
 
i can see that the directory network and /mnt/flash/etc/... and so on i writeable and also zhe /tmp too
 
and when i create a file in the /tmp directory i can save it.....
 
 
what can i do???
 
thx
 
ps i have modified the file ptablespec