u-boot-2010.03在tq6410上的移植详解（六）

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3）drivers/mtd/nand/nand_base.c

在2095行处红色字体为修改部分：

static int nand_write(struct mtd_info *mtd, loff_t to, size_t len,

                    size_t *retlen, const uint8_t *buf)

{

      struct nand_chip *chip = mtd->priv;

      int ret;

      #if defined(CONFIG_SYS_NAND_YAFFS_WRITE)

             int oldopsmode = 0;

             if(mtd->rw_oob==1)

             {

                    size_t oobsize =mtd->oobsize;  

                    size_t datasize = mtd->writesize;

                    int i=0;

                    uint8_t oobtemp[oobsize];

                    int datapages = 0;

                    datapages = len/(datasize);

                    for(i=0;i<(datapages);i++)

                    {

                           memcpy((void *)oobtemp,(void *)(buf+datasize*(i+1)),oobsize);

                           memmove((void *)(buf+datasize*(i+1)),(void *)(buf+datasize*(i+1)+oobsize),(datapages-(i+1))*(datasize)+(datapages-1)*oobsize);

                           memcpy((void *)(buf+(datapages)*(datasize+oobsize)-oobsize),(void *)(oobtemp),oobsize);

                    }

             }

      #endif

      /* Do not allow reads past end of device */

      if ((to + len) > mtd->size)

             return -EINVAL;

      if (!len)

             return 0;

      nand_get_device(chip, mtd, FL_WRITING);

      chip->ops.len = len;

      chip->ops.datbuf = (uint8_t *)buf;

      #if !defined(CONFIG_SYS_NAND_YAFFS_WRITE)

      chip->ops.oobbuf = NULL;

      #endif

      #if defined(CONFIG_SYS_NAND_YAFFS_WRITE)

             if(mtd->rw_oob!=1)

             {

                    chip->ops.oobbuf = NULL;

             }

             else

             {

                    chip->ops.oobbuf = (uint8_t*)(buf+len);

                    chip->ops.ooblen = mtd->oobsize;

                    oldopsmode = chip->ops.mode;

                    chip->ops.mode = MTD_OOB_RAW;

             }    

      #endif

      ret = nand_do_write_ops(mtd, to, &chip->ops);

      *retlen = chip->ops.retlen;

      nand_release_device(mtd);

      #if defined(CONFIG_SYS_NAND_YAFFS_WRITE)

             chip->ops.mode = oldopsmode;      

      #endif

      return ret;

}