--- /opt/mtd/drivers/mtd/nand/nand_base.c	2004-12-14 07:00:18.000000000 +0800
+++ nand_base.c	2005-01-01 21:58:19.000000000 +0800
@@ -66,6 +66,8 @@
 #include <linux/mtd/partitions.h>
 #endif
 
+#define NAND_USE_IO_INSTR	1
+
 /* Define default oob placement schemes for large and small page devices */
 static struct nand_oobinfo nand_oob_8 = {
 	.useecc = MTD_NANDECC_AUTOPLACE,
@@ -171,7 +173,13 @@
 static u_char nand_read_byte(struct mtd_info *mtd)
 {
 	struct nand_chip *this = mtd->priv;
-	return readb(this->IO_ADDR_R);
+
+	switch(NAND_USE_IO_INSTR) {
+	case 0:
+		return readb(this->IO_ADDR_R);
+	case 1:
+		return inb((unsigned int) this->IO_ADDR_R);
+	}
 }
 
 /**
@@ -184,7 +192,15 @@
 static void nand_write_byte(struct mtd_info *mtd, u_char byte)
 {
 	struct nand_chip *this = mtd->priv;
-	writeb(byte, this->IO_ADDR_W);
+
+	switch(NAND_USE_IO_INSTR) {
+	case 0:
+		writeb(byte, this->IO_ADDR_W);
+		break;
+	case 1:
+		outb(byte, (unsigned int) this->IO_ADDR_W);
+		break;
+	}
 }
 
 /**
@@ -277,8 +293,16 @@
 	int i;
 	struct nand_chip *this = mtd->priv;
 
-	for (i=0; i<len; i++)
-		writeb(buf[i], this->IO_ADDR_W);
+	switch(NAND_USE_IO_INSTR) {
+	case 0:
+		for (i=0; i<len; i++)
+			writeb(buf[i], this->IO_ADDR_W);
+		break;
+	case 1:
+		for (i=0; i<len; i++)
+			outb(buf[i], (unsigned int) this->IO_ADDR_W);
+		break;
+	}
 }
 
 /**
@@ -294,8 +318,16 @@
 	int i;
 	struct nand_chip *this = mtd->priv;
 
-	for (i=0; i<len; i++)
-		buf[i] = readb(this->IO_ADDR_R);
+	switch(NAND_USE_IO_INSTR) {
+	case 0:
+		for (i=0; i<len; i++)
+			buf[i] = readb(this->IO_ADDR_R);
+		break;
+	case 1:
+		for (i=0; i<len; i++)
+			buf[i] = inb((unsigned int) this->IO_ADDR_R);
+		break;
+	}
 }
 
 /**
@@ -311,10 +343,18 @@
 	int i;
 	struct nand_chip *this = mtd->priv;
 
-	for (i=0; i<len; i++)
-		if (buf[i] != readb(this->IO_ADDR_R))
-			return -EFAULT;
-
+	switch(NAND_USE_IO_INSTR) {
+	case 0:
+		for (i=0; i<len; i++)
+			if (buf[i] != readb(this->IO_ADDR_R))
+				return -EFAULT;
+		break;
+	case 1:
+		for (i=0; i<len; i++)
+			if (buf[i] != inb((unsigned int) this->IO_ADDR_R))
+				return -EFAULT;
+		break;
+	}
 	return 0;
 }