我的开发板上外接256M的K9F2G08U0A FLASH芯片。uboot-2012-10本身不带s5pv210的nandflash操作，s5pv210的nandflash和s3c2410的寄存器差不多，所以，我就在s3c2410的nandFlash上进行修改了，因为我不懂nandflash的HW_EEC，所以我实现的是SOFT_EEC了。

1.修改include/configs/smdkv210.h +88

 

/*#undef CONFIG_CMD_NAND*/#define CONFIG_CMD_NAND#define CONFIG_SYS_MAX_NAND_DEVICE 1#define CONFIG_SYS_NAND_BASE 0xB0E00000#define CONFIG_NAND_S3C2410

 

2.修改drivers/mtd/nand/s3c2410_nand.c +207，屏蔽了s3c2410的nandflash初始化，添加了s5pv210nandflash总线的初始化和nandflash控制器的初始化，并添加s5pv210_select_chip函数，其他不变。 

 

int board_nand_init(struct nand_chip *nand){#if 0u_int32_t cfg;u_int8_t tacls, twrph0, twrph1;struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();struct s3c2410_nand *nand_reg = s3c2410_get_base_nand();debug("board_nand_init()\n");writel(readl(&clk_power->clkcon) | (1 << 4), &clk_power->clkcon);/* initialize hardware */#if defined(CONFIG_S3C24XX_CUSTOM_NAND_TIMING)tacls  = CONFIG_S3C24XX_TACLS;twrph0 = CONFIG_S3C24XX_TWRPH0;twrph1 =  CONFIG_S3C24XX_TWRPH1;#elsetacls = 4;twrph0 = 8;twrph1 = 8;#endifcfg = S3C2410_NFCONF_EN;cfg |= S3C2410_NFCONF_TACLS(tacls - 1);cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);writel(cfg, &nand_reg->nfconf);#endif#define MP0_1CON (*(volatile unsigned int *)0xE02002E0)#define MP0_3CON (*(volatile unsigned int *)0xE0200320)#define NFCONF   (*(volatile unsigned int *)0xB0E00000)#define NFCONT   (*(volatile unsigned int *)0xB0E00004)#define NFCMMD   (*(volatile unsigned char *)0xB0E00008)#define NFADDR   (*(volatile unsigned char *)0xB0E0000C)#define NFDATA   (*(volatile unsigned char *)0xB0E00010)#define NFSTAT   (*(volatile unsigned int *)0xB0E00028)#define NFCONF_VAL ((7<<12)|(7<<8)|(7<<4)|(0<<3)|(0<<2)|(1<<1))#define NFCONT_VAL ((1<<23)|(1<<22)|(1<<2)|(0<<1)|(1<<0))unsigned int tmp;//tmp = MP0_1CON;//tmp &= ~((0xf<<8)|(0xf<<12));//tmp |= (0x3<<8) | (0x3<<12);//MP0_1CON = tmp;tmp = MP0_1CON;tmp &= ~(0xf<<16);tmp |= (0x3<<16);MP0_1CON = tmp;tmp = MP0_3CON;//tmp &= ~((0xf<<0)|(0xf<<4)|(0xf<<8)|(0xf<<12)|(0xf<<16)|(0xf<<20));//tmp |= (0x2<<0)|(0x2<<4)|(0x2<<8)|(0x2<<12)|(0x2<<16)|(0x2<<20);tmp &= ~((0xf<<0)|(0xf<<4)|(0xf<<8)|(0xf<<12)|(0xf<<16));tmp |= (0x2<<0)|(0x2<<4)|(0x2<<8)|(0x2<<12)|(0x2<<16);MP0_3CON = tmp;NFCONF = NFCONF_VAL;NFCONT = NFCONT_VAL;/* initialize nand_chip data structure */nand->IO_ADDR_R = (volatile unsigned char *)0xB0E00010;nand->IO_ADDR_W = (volatile unsigned char *)0xB0E00010;nand->select_chip = s5pv210_select_chip;/* read_buf and write_buf are default *//* read_byte and write_byte are default */#ifdef CONFIG_NAND_SPLnand->read_buf = nand_read_buf;#endif/* hwcontrol always must be implemented */nand->cmd_ctrl = s3c2410_hwcontrol;nand->dev_ready = s3c2410_dev_ready;#ifdef CONFIG_S3C2410_NAND_HWECCnand->ecc.hwctl = s3c2410_nand_enable_hwecc;nand->ecc.calculate = s3c2410_nand_calculate_ecc;nand->ecc.correct = s3c2410_nand_correct_data;nand->ecc.mode = NAND_ECC_HW;nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE;nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES;#elsenand->ecc.mode = NAND_ECC_SOFT;#endif#ifdef CONFIG_S3C2410_NAND_BBTnand->options = NAND_USE_FLASH_BBT;#elsenand->options = 0;#endifdebug("end of nand_init\n");return 0;}

 

3.在drivers/mtd/nand/s3c2410_nand.c 添加s5pv210_select_chip函数 

 

static void s5pv210_select_chip(struct mtd_info *mtd, int chipnr){#define NFCONT   (*(volatile unsigned int *)0xB0E00004)struct nand_chip *chip = mtd->priv;switch (chipnr) {case -1://chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);NFCONT |= (1<<1);break;case 0:NFCONT &= ~(1<<1);break;default:BUG();}}

 

4.修改drivers/mtd/nand/s3c2410_nand.c 的s3c2410_hwcontrol函数 

 

static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl){#if 0struct nand_chip *chip = mtd->priv;struct s3c2410_nand *nand = s3c2410_get_base_nand();debug("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 |= S3C2410_ADDR_NCLE;if (!(ctrl & NAND_ALE))IO_ADDR_W |= S3C2410_ADDR_NALE;chip->IO_ADDR_W = (void *)IO_ADDR_W;if (ctrl & NAND_NCE)writel(readl(&nand->nfconf) & ~S3C2410_NFCONF_nFCE,&nand->nfconf);elsewritel(readl(&nand->nfconf) | S3C2410_NFCONF_nFCE,&nand->nfconf);}if (cmd != NAND_CMD_NONE)writeb(cmd, chip->IO_ADDR_W);#endif#define NFCMMD   (*(volatile unsigned char *)0xB0E00008)#define NFADDR   (*(volatile unsigned char *)0xB0E0000C)if (cmd != NAND_CMD_NONE) {if (ctrl & NAND_CLE) {NFCMMD = cmd;//printf ("cmd: %x\n", cmd);//writeb(cmd, NFCMMD);}else if (ctrl & NAND_ALE) {//writeb(cmd, NFADDR);NFADDR = cmd;//printf ("addr: %x\n", cmd);}}}

 

5.make，使用命令下载到sd卡里，上电，观察控制台，可以看到，识别出了256M的nandflash了，以后就可以对nandflash进行操作了。  

 

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