#define MEMERASE64 _IOW('M', 20, struct erase_info_user64)
#define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64)
#define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64)
-+#define MTDREFRESH _IO('M', 23)
++#define MTDREFRESH _IO('M', 50)
/*
* Obsolete legacy interface. Keep it in order not to break userspace