--- zzzz-none-000/linux-3.10.107/drivers/mtd/nand/nuc900_nand.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/drivers/mtd/nand/nuc900_nand.c	2021-11-10 11:53:55.000000000 +0000
@@ -112,6 +112,22 @@
 		write_data_reg(nand, buf[i]);
 }
 
+static int nuc900_verify_buf(struct mtd_info *mtd,
+			     const unsigned char *buf, int len)
+{
+	int i;
+	struct nuc900_nand *nand;
+
+	nand = container_of(mtd, struct nuc900_nand, mtd);
+
+	for (i = 0; i < len; i++) {
+		if (buf[i] != read_data_reg(nand))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
 static int nuc900_check_rb(struct nuc900_nand *nand)
 {
 	unsigned int val;
@@ -267,6 +283,7 @@
 	chip->read_byte		= nuc900_nand_read_byte;
 	chip->write_buf		= nuc900_nand_write_buf;
 	chip->read_buf		= nuc900_nand_read_buf;
+	chip->verify_buf	= nuc900_verify_buf;
 	chip->chip_delay	= 50;
 	chip->options		= 0;
 	chip->ecc.mode		= NAND_ECC_SOFT;