unified preinit environment

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7173 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/bin/firstboot

@@ -79,8 +79,6 @@ ramoverlay() {
 	}
 
 	[ "$1" = "switch2jffs" ] && {
-		mtd erase "$partname"
-
 		# try to avoid fs changing while copying
 		mount -o remount,ro none / 2>&-
 
@@ -103,8 +101,6 @@ ramoverlay() {
 		# this will almost always fail
 		umount /tmp/root 2>&-
 
-		# fs is clean
-		jffs2root --clean
 		exit 0
 	}