5.1 添加s3c2440_nand.c
[408@WZC u-boot-2011.03]$ touch drivers/mtd/nand/s3c2440_nand.c?
[408@WZC u-boot-2011.03]$ cat> drivers/mtd/nand/s3c2440_nand.c
#include <common.h>
#if 0
#define DEBUGN??? printf
#else
#define DEBUGN(x,args ...) {}
#endif
#include <nand.h>
#include <asm/arch/s3c24x0_cpu.h>
#include <asm/io.h>
#define __REGb(x)??? (*(volatile unsigned char *)(x))
#define __REGi(x)??? (*(volatile unsigned int *)(x))
#define NF_BASE? 0x4e000000???????????? //Nand配置寄存器基地址
#define NFCONF?? __REGi(NF_BASE + 0x0)? //偏移后还是得到配置寄存器基地址
#define NFCONT?? __REGi(NF_BASE + 0x4)? //偏移后得到Nand控制寄存器基地址
#define NFCMD??? __REGb(NF_BASE + 0x8)? //偏移后得到Nand指令寄存器基地址
#define NFADDR?? __REGb(NF_BASE + 0xc)? //偏移后得到Nand地址寄存器基地址
#define NFDATA?? __REGb(NF_BASE + 0x10) //偏移后得到Nand数据寄存器基地址
#define NFMECCD0 __REGi(NF_BASE + 0x14) //偏移后得到Nand主数据区域ECC0寄存器基地址
#define NFMECCD1 __REGi(NF_BASE + 0x18) //偏移后得到Nand主数据区域ECC1寄存器基地址
#define NFSECCD? __REGi(NF_BASE + 0x1C) //偏移后得到Nand空闲区域ECC寄存器基地址
#define NFSTAT?? __REGb(NF_BASE + 0x20) //偏移后得到Nand状态寄存器基地址
#define NFSTAT0? __REGi(NF_BASE + 0x24) //偏移后得到Nand ECC0状态寄存器基地址
#define NFSTAT1? __REGi(NF_BASE + 0x28) //偏移后得到Nand ECC1状态寄存器基地址
#define NFMECC0? __REGi(NF_BASE + 0x2C) //偏移后得到Nand主数据区域ECC0状态寄存器基地址
#define NFMECC1? __REGi(NF_BASE + 0x30) //偏移后得到Nand主数据区域ECC1状态寄存器基地址
#define NFSECC?? __REGi(NF_BASE + 0x34) //偏移后得到Nand空闲区域ECC状态寄存器基地址
#define NFSBLK?? __REGi(NF_BASE + 0x38) //偏移后得到Nand块开始地址
#define NFEBLK?? __REGi(NF_BASE + 0x3c) //偏移后得到Nand块结束地址
#define S3C2440_NFCONT_nCE? (1<<1)
#define S3C2440_ADDR_NALE?? 0x0c
#define S3C2440_ADDR_NCLE?? 0x08
ulong IO_ADDR_W = NF_BASE;
static void s3c2440_hwcontrol(struct mtd_info *mtd,int cmd,unsigned int ctrl)
{
?struct nand_chip *chip = mtd->priv;
?DEBUGN("hwcontrol(): 0x%02x 0x%02x/n",cmd,ctrl);
?if (ctrl & NAND_CTRL_CHANGE)
?{
??IO_ADDR_W = NF_BASE;
??if (!(ctrl & NAND_CLE))??????????????? //要写的是地址
???IO_ADDR_W |= S3C2440_ADDR_NALE;
??if (!(ctrl & NAND_ALE))??????????????? //要写的是命令
???IO_ADDR_W |= S3C2440_ADDR_NCLE;
??if (ctrl & NAND_NCE)?
???NFCONT &= ~S3C2440_NFCONT_nCE;??? //使能nand flash
??else
???NFCONT |= S3C2440_NFCONT_nCE;???? //禁止nand flash
?}
?if (cmd != NAND_CMD_NONE)
??writeb(cmd,(void *)IO_ADDR_W);
}
static int s3c2440_dev_ready(struct mtd_info *mtd)
{
?DEBUGN("dev_ready/n");
?return (NFSTAT & 0x01);
}
int board_nand_init(struct nand_chip *nand)
{
?u_int32_t cfg;
?u_int8_t tacls,twrph0,twrph1;
?struct s3c24x0_clock_power * const clk_power = s3c24x0_get_base_clock_power();
?DEBUGN("board_nand_init()/n");
?tacls = 1;
?twrph0 = 2;?
?twrph1 = 1;?
?cfg = (tacls<<12)|(twrph0<<8)|(twrph1<<4);
?NFCONF = cfg;
?cfg = (1<<6)|(1<<4)|(0<<1)|(1<<0);
?NFCONT = cfg;
?/* initialize nand_chip data structure */
?nand->IO_ADDR_R = nand->IO_ADDR_W = (void *)0x4e000010;
?/* read_buf and write_buf are default */
?/* read_byte and write_byte are default */
?/* hwcontrol always must be implemented */
?nand->cmd_ctrl = s3c2440_hwcontrol;
?nand->dev_ready = s3c2440_dev_ready;
?return 0;
}
?【说明】
经过几次测试，yaffs2写入不太稳定，修改上面红色部分后，yaffs2写入正常。
5.2 drivers/mtd/nand/Makefile
COBJS-$(CONFIG_NAND_S3C2440) += s3c2440_nand.o
?
5.3 include/conskfigs/micro2440.h
添加
#define CONFIG_MTD_DEVICE
#define CONFIG_NAND_S3C2440
#define CONFIG_CMD_NAND
#if defined(CONFIG_CMD_NAND)
#define CONFIG_SYS_NAND_BASE??????????? 0x4E000000 //Nand配置寄存器基地址
#define CONFIG_SYS_MAX_NAND_DEVICE????? 1
#define CONFIG_MTD_NAND_VERIFY_WRITE??? 1
#endif
?
#define CONFIG_ENV_IS_IN_NAND? 1
#define CONFIG_ENV_OFFSET????? 0x40000 //将环境变量保存到nand中的0x40000位置
#define CONFIG_ENV_SIZE??????? 0x10000 /* Total Size of Environment Sector */
