I have been testing new colinux development kernel 2.6.26 with ext4 support with colinux devel branch (0.8.0). 
It seems to work ok if mounted read-only. But CONFIG_LSF kernel option is needed to mount partitions read-write, which seems not checked.
Could you check it for next devel release please?

http://cateee.net/lkddb/web-lkddb/LSF.html

Thank you
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Agustin Pizarro