fl2440的U-boot-2010.09移栽（五）uboot架构中NAND Flash驱动修改

fl2440的U-boot-2010.09移植（五）uboot架构中NAND Flash驱动修改

uboot代码中的NAND Flash的读写驱动中存在一些错误，需要进行修改后才能完成，主要修改drivers/mtd/nand/s3c2410_nand.c文件，首先修改27行如下：

#define NF_BASE         0x4e000000#if defined(CONFIG_S3C2410)#define S3C2410_NFCONF_EN          (1&lt;&lt;15)#define S3C2410_NFCONF_512BYTE     (1&lt;&lt;14)#define S3C2410_NFCONF_4STEP       (1&lt;&lt;13)#define S3C2410_NFCONF_INITECC     (1&lt;&lt;12)#define S3C2410_NFCONF_nFCE        (1&lt;&lt;11)#define S3C2410_NFCONF_TACLS(x)    ((x)&lt;&lt;8)#define S3C2410_NFCONF_TWRPH0(x)   ((x)&lt;&lt;4)#define S3C2410_NFCONF_TWRPH1(x)   ((x)&lt;&lt;0)#define S3C2410_ADDR_NALE 4#define S3C2410_ADDR_NCLE 8#endif#if defined(CONFIG_S3C2440)#define S3C2410_NFCONT_EN          (1&lt;&lt;0)#define S3C2410_NFCONT_INITECC     (1&lt;&lt;4)#define S3C2410_NFCONT_nFCE        (1&lt;&lt;1)#define S3C2410_NFCONT_MAINECCLOCK (1&lt;&lt;5)#define S3C2410_NFCONF_TACLS(x)    ((x)&lt;&lt;12)#define S3C2410_NFCONF_TWRPH0(x)   ((x)&lt;&lt;8)#define S3C2410_NFCONF_TWRPH1(x)   ((x)&lt;&lt;4) #define S3C2410_ADDR_NALE 0x08#define S3C2410_ADDR_NCLE 0x0c#endif

u-boot.2010.09自带的S3C2410_nand.c的s3c2410_hwcontrol函数有错。在此函数中，把chip->IO_ADDR_W值改写了，导致在写数据时出现错误。解决方法是使用一全局变量代替 chip->IO_ADDR_W。在 s3c2410_hwcontrol 函数上一行定义这个全局变量，然后修改 s3c2410_hwcontrol 函数（修改71行），让它支持 S3C2440，如下：

ulong IO_ADDR_W = NF_BASE;static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl){//struct nand_chip *chip = mtd-&gt;priv;struct s3c2410_nand *nand = s3c2410_get_base_nand();debugX(1, "hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl);        if (ctrl & NAND_CTRL_CHANGE) {//ulong IO_ADDR_W = (ulong)nand;                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-&gt;IO_ADDR_W = (void *)IO_ADDR_W;#if defined(CONFIG_S3C2410)if (ctrl & NAND_NCE)writel(readl(&nand-&gt;NFCONF) & ~S3C2410_NFCONF_nFCE,       &nand-&gt;NFCONF);elsewritel(readl(&nand-&gt;NFCONF) | S3C2410_NFCONF_nFCE,       &nand-&gt;NFCONF);#endif#if defined(CONFIG_S3C2440)if (ctrl & NAND_NCE)writel(readl(&nand-&gt;NFCONT) & ~S3C2410_NFCONT_nFCE,       &nand-&gt;NFCONT);elsewritel(readl(&nand-&gt;NFCONT) | S3C2410_NFCONT_nFCE,       &nand-&gt;NFCONT);#endif}if (cmd != NAND_CMD_NONE)//writeb(cmd, chip-&gt;IO_ADDR_W);                writeb(cmd, (void *)IO_ADDR_W);}

然后修改函数s3c2410_nand_enable_hwecc如下：

void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode){struct s3c2410_nand *nand = s3c2410_get_base_nand();debugX(1, "s3c2410_nand_enable_hwecc(%p, %d)\n", mtd, mode);#if defined(CONFIG_S3C2410)writel(readl(&nand-&gt;NFCONF) | S3C2410_NFCONF_INITECC, &nand-&gt;NFCONF);#endif#if defined(CONFIG_S3C2440)writel(readl(&nand-&gt;NFCONT) | S3C2410_NFCONT_INITECC, &nand-&gt;NFCONT);#endif}

最后修改board_nand_init 函数如下：

int board_nand_init(struct nand_chip *nand){u_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();debugX(1, "board_nand_init()\n");writel(readl(&clk_power-&gt;CLKCON) | (1 &lt;&lt; 4), &clk_power-&gt;CLKCON);#if defined(CONFIG_S3C2410)/* initialize hardware */twrph0 = 3;twrph1 = 0;tacls = 0;cfg = 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-&gt;NFCONF);/* initialize nand_chip data structure */nand-&gt;IO_ADDR_R = nand-&gt;IO_ADDR_W = (void *)&nand_reg-&gt;NFDATA;#endif#if defined(CONFIG_S3C2440)/* initialize hardware */tacls = 0;        twrph0 = 4;twrph1 = 2;        cfg = 0;         cfg |= S3C2410_NFCONF_TACLS(tacls - 1);         cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);         cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);         writel(cfg, &nand_reg-&gt;NFCONF);                 cfg = (0&lt;&lt;13)|(0&lt;&lt;12)|(0&lt;&lt;10)|(0&lt;&lt;9)|(0&lt;&lt;8)|(0&lt;&lt;6)|(0&lt;&lt;5)|(1&lt;&lt;4)|(0&lt;&lt;1)|(1&lt;&lt;0);         writel(cfg, &nand_reg-&gt;NFCONT);         /* initialize nand_chip data structure */         nand-&gt;IO_ADDR_R = nand-&gt;IO_ADDR_W = (void *)&nand_reg-&gt;NFDATA;#endifnand-&gt;select_chip = NULL;……

fl2440的U-boot-2010.09移栽（五）ubo

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