diff --git a/components/dfs/include/dfs_fs.h b/components/dfs/include/dfs_fs.h
index d3a00fc542..58a9e5cf55 100644
--- a/components/dfs/include/dfs_fs.h
+++ b/components/dfs/include/dfs_fs.h
@@ -90,6 +90,7 @@ int dfs_unmount(const char *specialfile);
 
 int dfs_mkfs(const char *fs_name, const char *device_name);
 int dfs_statfs(const char *path, struct statfs *buffer);
+int dfs_mount_device(rt_device_t dev);
 
 #ifdef __cplusplus
 }
diff --git a/components/dfs/src/dfs_fs.c b/components/dfs/src/dfs_fs.c
index 04d862e85d..164beed719 100644
--- a/components/dfs/src/dfs_fs.c
+++ b/components/dfs/src/dfs_fs.c
@@ -508,7 +508,7 @@ int dfs_mount_table(void)
                       mount_table[index].rwflag,
                       mount_table[index].data) != 0)
         {
-            rt_kprintf("mount fs[%s] on %s failed.\n", mount_table[index].filesystemtype,
+            LOG_E("mount fs[%s] on %s failed.\n", mount_table[index].filesystemtype,
                        mount_table[index].path);
             return -RT_ERROR;
         }
@@ -518,6 +518,43 @@ int dfs_mount_table(void)
     return 0;
 }
 INIT_ENV_EXPORT(dfs_mount_table);
+
+int dfs_mount_device(rt_device_t dev)
+{
+  int index = 0;
+  
+  if(dev == RT_NULL) {
+    rt_kprintf("the device is NULL to be mounted.\n");
+    return -RT_ERROR;
+  }
+  
+  while (1)
+  {
+    if (mount_table[index].path == NULL) break;
+    
+    if(strcmp(mount_table[index].device_name, dev->parent.name) == 0) {
+      if (dfs_mount(mount_table[index].device_name,
+                    mount_table[index].path,
+                    mount_table[index].filesystemtype,
+                    mount_table[index].rwflag,
+                    mount_table[index].data) != 0)
+      {
+        LOG_E("mount fs[%s] device[%s] to %s failed.\n", mount_table[index].filesystemtype, dev->parent.name,
+                   mount_table[index].path);
+        return -RT_ERROR;
+      } else {
+        LOG_D("mount fs[%s] device[%s] to %s ok.\n", mount_table[index].filesystemtype, dev->parent.name,
+                   mount_table[index].path);
+        return RT_EOK;
+      }
+    }
+    
+    index ++;
+  }
+  
+  rt_kprintf("can't find device:%s to be mounted.\n", dev->parent.name);
+  return -RT_ERROR;
+}
 #endif
 
 #ifdef RT_USING_FINSH
diff --git a/components/dfs/src/poll.c b/components/dfs/src/poll.c
index 473b1579d2..3f304549f7 100644
--- a/components/dfs/src/poll.c
+++ b/components/dfs/src/poll.c
@@ -19,6 +19,8 @@
 #include <dfs_posix.h>
 #include <dfs_poll.h>
 
+#ifdef RT_USING_POSIX
+
 struct rt_poll_node;
 
 struct rt_poll_table
@@ -214,3 +216,4 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
     return num;
 }
 
+#endif 
diff --git a/components/dfs/src/select.c b/components/dfs/src/select.c
index b20f7cf656..181855bc74 100644
--- a/components/dfs/src/select.c
+++ b/components/dfs/src/select.c
@@ -14,6 +14,8 @@
 #include <dfs_poll.h>
 #include <dfs_select.h>
 
+#ifdef RT_USING_POSIX
+
 static void fdszero(fd_set *set, int nfds)
 {
     fd_mask *m;
@@ -178,3 +180,4 @@ int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struc
     return ret;
 }
 
+#endif 
diff --git a/components/drivers/sdio/block_dev.c b/components/drivers/sdio/block_dev.c
index cac4fc5036..5db0f38c08 100644
--- a/components/drivers/sdio/block_dev.c
+++ b/components/drivers/sdio/block_dev.c
@@ -472,7 +472,7 @@ rt_int32_t rt_mmcsd_blk_probe(struct rt_mmcsd_card *card)
             }
 
 #ifdef RT_USING_DFS_MNTTABLE
-            if (0) // if (blk_dev)
+            if (blk_dev)
             {
             	LOG_I("try to mount file system!");
             	/* try to mount file system on this block device */
@@ -507,9 +507,10 @@ void rt_mmcsd_blk_remove(struct rt_mmcsd_card *card)
         	const char * mounted_path = dfs_filesystem_get_mounted_path(&(blk_dev->dev));
         	if (mounted_path)
         	{
-        		dfs_unmount(mounted_path);
+                  dfs_unmount(mounted_path);
+                  LOG_D("unmount file system %s for device %s.\r\n", mounted_path, blk_dev->dev.parent.name);
         	}
-
+            rt_sem_delete(blk_dev->part.lock);
             rt_device_unregister(&blk_dev->dev);
             rt_list_remove(&blk_dev->list);
             rt_free(blk_dev);