mpc5121_nfc_buf_copy
mpc5121_nfc_buf_copy(mtd, buf, len, wr);
mpc5121_nfc_buf_copy(nand_to_mtd(chip), buf, len, 0);
mpc5121_nfc_buf_copy(nand_to_mtd(chip), (u_char *)buf, len, 1);