add RT_DEVICE_CTRL_BLK_ERASE and struct rt_device_blk_sectors in rtdef.h

please see this commit with revision 2478

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2482 bbd45198-f89e-11dd-88c7-29a3b14d5316

include/rtdef.h

@@ -692,6 +692,7 @@ enum rt_device_class_type
 #define RT_DEVICE_CTRL_CHAR_STREAM      0x10            /**< stream mode on char device */
 #define RT_DEVICE_CTRL_BLK_GETGEOME     0x10            /**< get geometry information   */
 #define RT_DEVICE_CTRL_BLK_SYNC         0x11            /**< flush data to block device */
+#define RT_DEVICE_CTRL_BLK_ERASE		0x12 			/**< erase block on block device */
 #define RT_DEVICE_CTRL_NETIF_GETMAC     0x10            /**< get mac address */
 #define RT_DEVICE_CTRL_MTD_FORMAT       0x10            /**< format a MTD device */
 #define RT_DEVICE_CTRL_RTC_GET_TIME     0x10            /**< get time */
@@ -743,6 +744,15 @@ struct rt_device_blk_geometry
     rt_uint32_t block_size;                             /**< size to erase one block */
 };
 
+/**
+ * sector arrange struct on block device
+ */
+struct rt_device_blk_sectors
+{
+	rt_uint32_t sector_begin;							/**< begin sector */
+	rt_uint32_t sector_end;								/**< end sector   */
+};
+
 /**
  * graphic device control command
  */