info->chip.read_byte = rb4xx_nand_read_byte;
info->chip.write_buf = rb4xx_nand_write_buf;
info->chip.read_buf = rb4xx_nand_read_buf;
-// info->chip.verify_buf = rb4xx_nand_verify_buf;
+#if 0
+ info->chip.verify_buf = rb4xx_nand_verify_buf;
+#endif
info->chip.chip_delay = 25;
info->chip.ecc.mode = NAND_ECC_SOFT;