在smdk2440.h里面加上NAND的配置选项 

#define CONFIG_CMD_NAND

编译出错

drivers/mtd/nand/s3c2410_nand.c: In function 's3c2410_hwcontrol':

drivers/mtd/nand/s3c2410_nand.c:44: warning: implicit declaration of function 's3c2410_get_base_nand'

drivers/mtd/nand/s3c2410_nand.c:44: warning: initialization makes pointer from integer without a cast

drivers/mtd/nand/s3c2410_nand.c:59: error: dereferencing pointer to incomplete type

drivers/mtd/nand/s3c2410_nand.c:59: error: dereferencing pointer to incomplete type

drivers/mtd/nand/s3c2410_nand.c:62: error: dereferencing pointer to incomplete type

cp drivers/mtd/nand/s3c2410_nand.c drivers/mtd/nand/s3c2440_nand.c

在drivers/mtd/nand/Makefile添加

COBJS-$(CONFIG_NAND_S3C2410) += s3c2410_nand.o      

COBJS-$(CONFIG_NAND_S3C2440) += s3c2440_nand.o

同时需要修改配置文件smdk2440.h

         /*

         * NAND configuration

         */

        #ifdef CONFIG_CMD_NAND

        #define CONFIG_NAND_S3C2410        == >#define CONFIG_NAND_S3C2440 

        #define CONFIG_SYS_S3C2410_NAND_HWECC   ==>#define CONFIG_SYS_S3C2440_NAND_HWECC            

在drivers/mtd/nand/s3c2440_nand.c

nt board_nand_init(struct nand_chip *nand)

  #if 0

        cfg = S3C2440_NFCONF_EN;

        cfg |= S3C2440_NFCONF_TACLS(tacls - 1);

        cfg |= S3C2440_NFCONF_TWRPH0(twrph0 - 1);

        cfg |= S3C2440_NFCONF_TWRPH1(twrph1 - 1);

  #endif

        cfg = ((tacls-1)<<12)|((twrph0-1)<<8)|((twrph1-1)<<4);

        writel(cfg, &nand_reg->nfconf);

        

        writel((1<<4)|(1<<1)|(1<<0),&nand_reg->nfcont);

        。。。

                nand->select_chip = s3c2440_nand_select;

添加

static void s3c2440_nand_select(struct mtd_info *mtd, int chipnr)

{

        struct s3c2440_nand *nand = s3c2440_get_base_nand();

        switch (chipnr) {

        case -1:

                nand->nfcont |= (1<<1);

                break;

        case 0:

                nand->nfcont &= ~(1<<1);

                break;

        default:

                BUG();

        }

}

重写

static void s3c2440_hwcontrol(struct mtd_info *mtd, int dat, unsigned int ctrl)

{

        struct s3c2440_nand *nand = s3c2440_get_base_nand();

        if (ctrl & NAND_CLE)

        {

                writeb(dat, &nand->nfcmd);

        }

        else if(ctrl & NAND_ALE)

        {

                writeb(dat, &nand->nfaddr);

        }

}

重写编译烧录

U-Boot 2014.10 (Nov 01 2018 - 14:26:34)

        

        CPUID: 32440001

        FCLK:      400 MHz

        HCLK:      100 MHz

        PCLK:       50 MHz

        DRAM:  64 MiB

        WARNING: Caches not enabled

        Flash: 2 MiB

        NAND:  256 MiB

        *** Warning - bad CRC, using default environment

        

        In:    serial

        Out:   serial

        Err:   serial

        Net:   dm9000

        Warning: dm9000 MAC addresses don't match:

        Address in SROM is         ff:ff:ff:ff:ff:ff

        Address in environment is  00:0c:29:45:c4:c3

增加启动参数

在smdk2440.h里面添加宏

#define CONFIG_BOOTCOMMAND    "nand read.jffs2 0x30007FC0 0x60000 0x200000; bootm 0x30007FC0"

如果以前烧写过内核到0x60000的位置，那么现在可以顺利从nor flash启动内核