sd_ramdisk.c

   1
   2 #include <linux/types.h>
   3 #include <common.h>
   4 #include <part.h>
   5 #include <mmc.h>
   6 #include <fat.h>
   7
   8 //rootfs.cpio.gz
   9 #define SD_RAMDISK   "ramdisk.img"
  10
  11 #define TEST_VERIFY_FILE ".sprdtest"
  12
  13 int load_sd_ramdisk(void* buf,int size)
  14 {
  15         struct mmc *mmc;
  16         block_dev_desc_t *dev_desc=NULL;
  17         int ret = 0;
  18         char bufread[10];
  19
  20         printf("%s: tick=%ld\n",__func__,get_ticks());
  21
  22         mmc = find_mmc_device(0);
  23         if(mmc){
  24                 ret = mmc_init(mmc);
  25                 if(ret < 0){
  26                         printf("mmc init failed %d,tick=%d\n", ret,get_ticks());
  27                         return -1;
  28                 }
  29         }else{
  30                 printf("no mmc card found\n");
  31                 return -1;
  32         }
  33
  34         dev_desc = &mmc->block_dev;
  35         if(dev_desc==NULL){
  36                 printf("no mmc block device found\n");
  37                 return -1;
  38         }
  39         ret = fat_register_device(dev_desc, 1);
  40         if(ret < 0){
  41                 printf("fat regist fail %d\n", ret);
  42                 return -1;
  43         }
  44         ret = file_fat_detectfs();
  45         if(ret){
  46                 printf("detect fs failed\n");
  47                 return -1;
  48         }
  49
  50         ret = file_fat_read(TEST_VERIFY_FILE, bufread, 10);
  51         if (ret<=0){
  52                 printf("sd verity file read error %d\n", ret);
  53                 return ret;
  54         }
  55
  56         ret = file_fat_read(SD_RAMDISK, buf, size);
  57         if(ret <= 0){
  58                 printf("sd file read error %d\n", ret);
  59         }
  60         printf("fat_read %d,tick=%ld\n", ret,get_ticks());
  61         return ret;
  62 }
  63