[U-Boot] about nand_read_byte() interface

[HeLei]

Hi, all
I'm a little confused on NAND read operation. 
According to NAND character, NAND flash is read page by page, which mean's once you read,  at least you should read data with page size (such as 512Bytes)
But the nand_read_byte() is implemented as following:	static u_char nand_read_byte(struct mtd_info *mtd)	{		struct nand_chip *this = mtd->priv;		return readb(this->IO_ADDR_R);	}it seems only one byte is read out.
Anybody can tell what's wrong with my understanding?
ThanksLeon 		 	   		  
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