cd drivers/mtd/nand/
cp s3c2410_nand.c s3c2440_nand.c
代码如下
寄存器操作说明：
readl函数原型
#define readl(addr) (*(volatile unsigned int*)(addr))
writeb函数原型
#define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))


#include
#include
#include
#include

#define S3C2440_NFCONT_EN (1<<0)
#define S3C2440_NFCONT_nFCE (0<<1)
#define S3C2440_NFCONT_INITECC (1<<4)
#define S3C2440_NFCONF_TACLS(x) ((x)<<12)
#define S3C2440_NFCONF_TWRPH0(x) ((x)<<8)
#define S3C2440_NFCONF_TWRPH1(x) ((x)<<4)

#define S3C2440_ADDR_NALE 0x0c
#define S3C2440_ADDR_NCLE 0x08

#ifdef CONFIG_NAND_SPL

/* in the early stage of NAND flash booting, printf() is not available */
#define printf(fmt, args...)

static void nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
{
int i;
struct nand_chip *this = mtd->priv;

for (i = 0; i < len; i++)
buf[i] = readb(this->IO_ADDR_R);
}
#endif

static void s3c2440_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *chip = mtd->priv;
struct s3c2440_nand *nand = s3c2440_get_base_nand();

debugX(1, "hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl);

if (ctrl & NAND_CTRL_CHANGE) {
ulong IO_ADDR_W = (ulong)nand;

if (!(ctrl & NAND_CLE))
IO_ADDR_W |= S3C2440_ADDR_NALE;
if (!(ctrl & NAND_ALE))
IO_ADDR_W |= S3C2440_ADDR_NCLE;//特别注意修改
chip->IO_ADDR_W = (void *)IO_ADDR_W;

if (ctrl & NAND_NCE)
writel(readl(&nand->nfcont) & (~(1<<1)),
&nand->nfcont);
else
writel(readl(&nand->nfcont) | (1<<1),
&nand->nfcont);
}

if (cmd != NAND_CMD_NONE)
writeb(cmd, chip->IO_ADDR_W);
}

static int s3c2440_dev_ready(struct mtd_info *mtd)
{
struct s3c2440_nand *nand = s3c2440_get_base_nand();
debugX(1, "dev_ready\n");
return readl(&nand->nfstat) & 0x01;
}

#ifdef CONFIG_S3C2440_NAND_HWECC
void s3c2440_nand_enable_hwecc(struct mtd_info *mtd, int mode)
{
struct s3c2440_nand *nand = s3c2440_get_base_nand();
debugX(1, "s3c2440_nand_enable_hwecc(%p, %d)\n", mtd, mode);
writel(readl(&nand->nfconf) | S3C2440_NFCONF_INITECC, &nand->nfconf);
}

static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
{
struct s3c2440_nand *nand = s3c2440_get_base_nand();
ecc_code[0] = readb(&nand->nfecc);
ecc_code[1] = readb(&nand->nfecc + 1);
ecc_code[2] = readb(&nand->nfecc + 2);
debugX(1, "s3c2440_nand_calculate_hwecc(%p,): 0x%02x 0x%02x 0x%02x\n",
mtd , ecc_code[0], ecc_code[1], ecc_code[2]);

return 0;
}

static int s3c2440_nand_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc)
{
if (read_ecc[0] == calc_ecc[0] &&
read_ecc[1] == calc_ecc[1] &&
read_ecc[2] == calc_ecc[2])
return 0;

printf("s3c2