如何在uboot/LK中读取raw分区

[DESCRIPTION]

 

        自己新建的raw data分区，如何在uboot/LK中读取数据。这里给出一段参考code

[SOLUTION]

 

这里的code供参考，得根据实际情况进行修改和完善。

////////////////////////////////////////
   printf("[demo_uboot]:read test partition in uboot\n");
  unsigned long begin;
#ifdef MTK_EMMC_SUPPORT
  unsigned long long start_addr;
  unsigned long long length;
#else
  unsigned long start_addr;
  unsigned long length;
#endif
    part_t *part; 
    part_dev_t *dev;
    part_hdr_t *part_hdr;
    char part_name[] ="test";
    length = 1024;
    
    printf("[demo_uboot] raw data part name[%s]\n",part_name);
    dev = mt6577_part_get_device();
    if (!dev)
    { 
        printf("[demo_uboot] mt6577 get device() failed\n");
        return -1;
    }

    part = mt6577_part_get_partition(part_name);
    if (!part)
    { 
        printf("[demo_uboot]get partition failed\n");
        return -1;
    }
    printf("[demo_uboot]part info name:%s\n",part->name);
    printf("[demo_uboot]part info startblk:%ld\n",part->startblk);
    printf("[demo_uboot]part info blks:%ld\n",part->blknum);

#ifdef MTK_EMMC_SUPPORT
  start_addr = (u64)part->startblk * BLK_SIZE; 
  length  = (u64)part->blknum* BLK_SIZE;
#else
    start_addr = part->startblk * BLK_SIZE;
    length  = part->blknum* BLK_SIZE;
#endif  
    printf("[demo_uboot]partition length:%ld\n",length);
    /*
    part_hdr = (part_hdr_t*)malloc(sizeof(part_hdr_t));

    
    if (!part_hdr)
    { 
        printf("[demo_uboot]part_hdr malloc memory faild\n");
        return -1;
    }
    len = mboot_common_load_part_info(dev, part_name, part_hdr);
    if (len < 0) {
        printf("[demo_uboot]load part info failed\n");
        len = -EINVAL;        
    }
    
  begin = get_timer(0);
    */
 //****************
    //* read image data
 //*
 printf("[demo_uboot]read the data of %s\n", part_name);

 unsigned char *addr;
 length = 512;
 addr = (unsigned char *)malloc(length*sizeof(char));
  len = dev->read(dev, start_addr, (uchar*)addr, length);    
  if (len < 0) {
      printf("[demo_uboot]read data failed\n");
      return -1;
  }
  int i = 0;
  for(i = 0;i<length;i++,addr++)
    printf("[demo_uboot] result:%x\n",*addr);

72上经常有需要在LK/Uboot中读取raw data分区中的一个数据，这里把常用到的几个接口在这里列举下.

 这些接口如下：

          （1）dev = mt_part_get_device();//获取一个设备

          （2）mt_part_get_partition(partition name);//获取设备上的一个分区

          （3）mboot_common_load_parition_info（...）;//加载分区的数据

          （4）dev->read(...);//读取分区上的数据

 

           参考源文件：

           （1）mt_partition.c

           （2）load_image.c