mtd_desc
+ sizeof(struct mtd_desc) * MTD_NUM_RXD));
size = (MTD_NUM_RXD + MTD_NUM_TXD) * sizeof(struct mtd_desc);
+ (i + 1) * sizeof(struct mtd_desc));
+MTD_NUM_RXD * sizeof(struct mtd_desc));
+ (i + 1) * sizeof(struct mtd_desc));
struct mtd_desc * desc;