第一章之s5pv210启动顺序

  1 /* 在BL0阶段，Irom内固化的代码读取nandflash或SD卡前16K的内容，
  2  * 并比对前16字节中的校验和是否正确，正确则继续，错误则停止。
  3  */
  4 #include <stdio.h>
  5 #include <string.h>
  6 #include <stdlib.h>
  7 
  8 #define BUFSIZE                 (16*1024)
  9 #define IMG_SIZE                (16*1024)
 10 #define SPL_HEADER_SIZE         16
 11 #define SPL_HEADER              "S5PC110 HEADER  "
 12 
 13 int main (int argc, char *argv[])
 14 {
 15     FILE        *fp;
 16     char        *Buf, *a;
 17     int        BufLen;
 18     int        nbytes, fileLen;
 19     unsigned int    checksum, count;
 20     int        i;
 21     
 22     // 1. 3个参数
 23     if (argc != 3)
 24     {
 25         printf("Usage: mkbl1 <source file> <destination file>\n");
 26         return -1;
 27     }
 28 
 29     // 2. 分配16K的buffer
 30     BufLen = BUFSIZE;
 31     Buf = (char *)malloc(BufLen);
 32     if (!Buf)
 33     {
 34         printf("Alloc buffer failed!\n");
 35         return -1;
 36     }
 37 
 38     memset(Buf, 0x00, BufLen);
 39 
 40     // 3. 读源bin到buffer
 41     // 3.1 打开源bin
 42     fp = fopen(argv[1], "rb");
 43     if( fp == NULL)
 44     {
 45         printf("source file open error\n");
 46         free(Buf);
 47         return -1;
 48     }
 49     // 3.2 获取源bin长度
 50     fseek(fp, 0L, SEEK_END);
 51     fileLen = ftell(fp);
 52     fseek(fp, 0L, SEEK_SET);
 53     // 3.3 源bin长度不得超过16K-16byte
 54     count = (fileLen < (IMG_SIZE - SPL_HEADER_SIZE))
 55         ? fileLen : (IMG_SIZE - SPL_HEADER_SIZE);
 56     // 3.4 buffer[0~15]存放"S5PC110 HEADER  "
 57     memcpy(&Buf[0], SPL_HEADER, SPL_HEADER_SIZE);
 58     // 3.5 读源bin到buffer[16]
 59     nbytes = fread(Buf + SPL_HEADER_SIZE, 1, count, fp);
 60     if ( nbytes != count )
 61     {
 62         printf("source file read error\n");
 63         free(Buf);
 64         fclose(fp);
 65         return -1;
 66     }
 67     fclose(fp);
 68 
 69     // 4. 计算校验和
 70      // 4.1 从第16byte开始统计buffer中共有几个1
 71     a = Buf + SPL_HEADER_SIZE;
 72     for(i = 0, checksum = 0; i < IMG_SIZE - SPL_HEADER_SIZE; i++)
 73         checksum += (0x000000FF) & *a++;
 74     // 4.2 将校验和保存在buffer[8~15]
 75     a = Buf + 8;
 76     *( (unsigned int *)a ) = checksum;
 77 
 78     // 5. 拷贝buffer中的内容到目的bin
 79     // 5.1 打开目的bin
 80     fp = fopen(argv[2], "wb");
 81     if (fp == NULL)
 82     {
 83         printf("destination file open error\n");
 84         free(Buf);
 85         return -1;
 86     }
 87     // 5.2 将16k的buffer拷贝到目的bin中
 88     a = Buf;
 89     nbytes    = fwrite( a, 1, BufLen, fp);
 90     if ( nbytes != BufLen )
 91     {
 92         printf("destination file write error\n");
 93         free(Buf);
 94         fclose(fp);
 95         return -1;
 96     }
 97 
 98     free(Buf);
 99     fclose(fp);
100 
101     return 0;
102 }