refer to：
http://blog.csdn.net/lanmanck/article/details/4204610
uboot下载：ftp://ftp.denx.de/pub/u-boot/
这里针对是make sbc2410x_config
拷贝如下代码到nand_legacy.c的适当位置：
?
/*-----------------------------------------------------------------------
* NAND flash basic functions
* Added by liuyaojin 2009.5.20
* Copied from board/mpl/vcma9/vcma9.h & vcma9.c
*/
#if (CONFIG_SMDK2410)
#include <s3c2410.h>
typedef enum {
NFCE_LOW,
NFCE_HIGH
} NFCE_STATE;
static inline void NF_Conf(u16 conf)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
nand->NFCONF = conf;
}
static inline void NF_Cmd(u8 cmd)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
nand->NFCMD = cmd;
}
static inline void NF_CmdW(u8 cmd)
{
NF_Cmd(cmd);
udelay(1);
}
static inline void NF_Addr(u8 addr)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
nand->NFADDR = addr;
}
static inline void NF_SetCE(NFCE_STATE s)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
switch (s) {
case NFCE_LOW:
nand->NFCONF &= ~(1<<11);
break;
case NFCE_HIGH:
nand->NFCONF |= (1<<11);
break;
}
}
static inline void NF_WaitRB(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
while (!(nand->NFSTAT & (1<<0)));
}
static inline void NF_Write(u8 data)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
nand->NFDATA = data;
}
static inline u8 NF_Read(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
return(nand->NFDATA);
}
static inline void NF_Init_ECC(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
nand->NFCONF |= (1<<12);
}
static inline u32 NF_Read_ECC(void)
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
return(nand->NFECC);
}
extern ulong nand_probe(ulong physadr);
static inline void NF_Reset(void)
{
int i;
NF_SetCE(NFCE_LOW);
NF_Cmd(0xFF); /* reset command */
for(i = 0; i < 10; i++); /* tWB = 100ns. */
NF_WaitRB(); /* wait 200~500us; */
NF_SetCE(NFCE_HIGH);
}
static inline void NF_Init(void)
{
#if 0 /* a little bit too optimistic */
#define TACLS 0
#define TWRPH0 3
#define TWRPH1 0
#else
#define TACLS 0
#define TWRPH0 4
#define TWRPH1 2
#endif
NF_Conf((1<<15)|(0<<14)|(0<<13)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0));
/*nand->NFCONF = (1<<15)|(1<<14)|(1<<13)|(1<<12)|(1<<11)|(TACLS<<8)|(TWRPH0<<4)|(TWRPH1<<0); */
/* 1 1 1 1,1 xxx,r xxx,r xxx */
/* En 512B 4step ECCR nFCE=H tACLS tWRPH0 tWRPH1 */
NF_Reset();
}
void nand_init(void)//注意有了这个后，要注销掉nand.c里的同样函数
{
S3C2410_NAND * const nand = S3C2410_GetBase_NAND();
NF_Init();
#ifdef DEBUG
printf("NAND flash probing at 0x%.8lX/n",(ulong)nand);
#endif
printf ("%4lu MB/n",nand_probe((ulong)nand) >> 20);
}
#endif /* (CONFIG_SMDK2410) */
2、在nand_legacy.c头上包含文件：
#include <configs/sbc2410x.h>
3、在sbc2410x.h把CFG_CMD_NAND打开，适当位置中插入如下代码：
/**** 注销掉enable ECC这个 #define CONFIG_MTD_NAND_ECC（不记得是不是这么写）***/
#define CFG_NAND_LEGACY 1
/*-----------------------------------------------------------------------
?* NAND flash settings
?*/
#if (CONFIG_COMMANDS & CFG_CMD_NAND)
#define CFG_MAX_NAND_DEVICE???? 1?????? /* Max number of NAND devices?????????? */
#define SECTORSIZE 512
#define ADDR_COLUMN 1
#define ADDR_PAGE 2
#define ADDR_COLUMN_PAGE 3
#define NAND_ChipID_UNKNOWN???? 0x00
#define NAND_MAX_FLOORS 1
#define NAND_MAX_CHIPS 1
#define NAND_WAIT_READY(nand)?? NF_WaitRB()
#define NAND_DISABLE_CE(nand)?? NF_SetCE(NFCE_HIGH)
#define NAND_ENABLE_CE(nand)??? NF_SetCE(NFCE_LOW)
#define WRITE_NAND_COMMAND(d,adr)????? NF_Cmd(d)
#define WRITE_NAND_COMMANDW(d,adr)???? NF_CmdW(d)
#define WRITE_NAND_ADDRESS(d,adr)????? NF_Addr(d)
#define WRITE_NAND(d,adr)????????????? NF_Write(d)
#define READ_NAND(adr)????????????????? NF_Read()
/* the following functions are NOP's because S3C24X0 handles this in hardware */
#define NAND_CTL_CLRALE(nandptr)
#define NAND_CTL_SETALE(nandptr)
#define NAND_CTL_CLRCLE(nandptr)
#define NAND_CTL_SETCLE(nandptr)
/* #undef CONFIG_MTD_NAND_VERIFY_WRITE */
#endif? /* CONFIG_COMMANDS & CFG_CMD_NAND */
#define CONFIG_MTD_NAND_ECC_JFFS2 1
//#endif /* CONFIG_COMMANDS & CFG_CMD_NAND */
//---------------添加结束-----------------------
4、make即可
需要注意的地方：
1、必须定义 #define CFG_NAND_LEGACY
2、#if (CONFIG_COMMANDS & CFG_CMD_NAND) 好像不起作用，大家小心点
