rootfs mtd partition to 256MB

conf/machine/boards/elphel393/elphel393.dts

@@ -431,7 +431,7 @@
                                 };
 				partition@4 {
                                         label = "rootfs";
-                                        reg = <0x1600000 0x4000000>;/*64MB*/
+                                        reg = <0x1600000 0x10000000>;/*256MB*/
                                 };
 			} ;
 		} ;