block_dev_desc_t* usb_stor_get_dev(int dev);
block_dev_desc_t* mmc_get_dev(int dev);
block_dev_desc_t* systemace_get_dev(int dev);
+block_dev_desc_t* mg_disk_get_dev(int dev);
/* disk/part.c */
int get_partition_info (block_dev_desc_t * dev_desc, int part, disk_partition_t *info);