This adds an option to eraseall that formats the block for jffs2.
This avoids the double erase that happens if you directly mount the
erased partition without first copying a jffs2 image to it.
 
-- 
Kenneth Johansson	
Ericsson AB                       Tel: +46 8 404 71 83
Borgafjordsgatan 9                Fax: +46 8 404 72 72
164 80 Stockholm                  kenneth.johansson@etx.ericsson.se