2010.09移植（五）uboot架构中NAND FLash驱动修改

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->CLKCON) | (1 << 4), &clk_power->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->NFCONF);          /* initialize nand_chip data structure */       nand->IO_ADDR_R = nand->IO_ADDR_W = (void *)&nand_reg->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->NFCONF);                       cfg = (0<<13)|(0<<12)|(0<<10)|(0<<9)|(0<<8)|(0<<6)|(0<<5)|(1<<4)|(0<<1)|(1<<0);            writel(cfg, &nand_reg->NFCONT);            /* initialize nand_chip data structure */            nand->IO_ADDR_R = nand->IO_ADDR_W = (void *)&nand_reg->NFDATA;   #endif           nand->select_chip = NULL;   ……