相对于操作NandFlash，操作NorFlash相对简单，因为基本不需要考虑坏块，NorFlash也没有OOB区域，也跟ECC没有一毛钱关系。它的读写擦除相对容易。
int dealwithnor()
{ // glob_t mtdbuf;
struct mtd_info_user mtd;
struct erase_info_user erase;
int blocks = ;
int i = ; //用于控制擦除的块的个数
int k = ;
int written = ; //已写入的字节数，只初始化一次
unsigned int size = StateOfImage.st_size; //应该是镜像的实际大小，因为内存中大于镜像的空间的内容不可预知
unsigned int result = ;
unsigned int DevNum = ; //设备的数量
unsigned int StartDev = ; //从第startDev开始擦除
char DevName[] = {};
unsigned int AllSize = ;
#define MAXPARTITIONS 40
struct DeviceInfo
{
int fd;
char dir[];
uint32_t size; // Total size of the MTD
uint32_t erasesize; }DevInfo[MAXPARTITIONS];//用来存储设备信息 bzero(DevInfo, sizeof(struct DeviceInfo)); /* 这是一种方法，但是有一个缺点，当mtd设备大于10个是，通过glob搜索出来的结果
会出问题，下面采用会采用第二种方法 */
// if(searchmtd(&mtdbuf) != 0){ // DEBUG("Sorry! Can not find mtd device\n");
// return 1; //返回大于零的数，表示升级失败
// }
// else
// {
// int fd;
//
// DEBUG("find %d mtd devices \n",mtdbuf.gl_pathc);
// DevNum = mtdbuf.gl_pathc; // for(i=0; i<DevNum; i++)
// {
// fd = safeOpen (mtdbuf.gl_pathv[i],O_SYNC | O_RDWR);
// if(fd < 0)
// {
// printf("failt to open\n");
// return 1;
// }
// bzero(&mtd, sizeof(struct mtd_info_user));
// if (ioctl(fd, MEMGETINFO,&mtd) < 0)
// {
// DEBUG("ioctl(): %m\n");
// DEBUG("This doesn't seem to be a valid MTD flash device!\n");
// return 1;
// }
//
// strcpy(DevInfo[i].dir, mtdbuf.gl_pathv[i]);
// DevInfo[i].fd = fd;
// DevInfo[i].size = mtd.size;
// DevInfo[i].erasesize = mtd.erasesize;
// } // globfree(&mtdbuf);
// for(i=0; i<DevNum; i++)
// {
// printf("\n\tinfo of %s\n",DevInfo[i].dir);
// printf("%s.fd: %d\n",DevInfo[i].dir, DevInfo[i].fd);
// printf("%s.size: %d\n",DevInfo[i].dir,DevInfo[i].size);
// printf("%s.erasesize: %d\n",DevInfo[i].dir,DevInfo[i].erasesize);
// }
// } /* 下面是第二种方法，这种方法克服了第一种方法的缺陷，不受mtd设备数量的限制 */ for(i=; i<MAXPARTITIONS; i++)
{
int fd;
sprintf(DevName, "%s%d", "/dev/mtd",i); if((fd = open (DevName,O_SYNC | O_RDWR)) > )
{
bzero(&mtd, sizeof(struct mtd_info_user));
if (ioctl(fd, MEMGETINFO,&mtd) < )
{
DEBUG("ioctl(): %m\n");
DEBUG("This doesn't seem to be a valid MTD flash device!\n");
return ;
}
strcpy(DevInfo[i].dir, DevName);
DevInfo[i].fd = fd;
DevInfo[i].size = mtd.size;
DevInfo[i].erasesize = mtd.erasesize;
}
else
{
DevNum = i;
break;
} } for(i=; i<DevNum; i++)
{
printf("\n\tinfo of %s\n",DevInfo[i].dir);
printf("%s.fd: %d\n",DevInfo[i].dir, DevInfo[i].fd);
printf("%s.size: %d\n",DevInfo[i].dir,DevInfo[i].size);
printf("%s.erasesize: %d\n",DevInfo[i].dir,DevInfo[i].erasesize);
AllSize += DevInfo[i].size;
} if(AllSize < StateOfImage.st_size)
{
DEBUG("ERROR!! all device size is less than ImageSize\n");
return ;
} for(i=StartDev; i<DevNum; i++)
{ /**
* 先进行擦除操作
*/
int j = ;
g_AllImgSize = DevInfo[i].size;
g_AllImgWrite = ;
erase.start = ;
blocks = DevInfo[i].size / mtd.erasesize; //计算要擦除的块的个数
erase.length = mtd.erasesize;
printf ("\nbegin to erase block %s\n", DevInfo[i].dir);
for (j= ; j <= blocks; j++)
{
fprintf(stderr, "\rErasing blocks: %d/%d (%d%%)", j, blocks, (int)PERCENTAGE (j, blocks));
g_percentage = * ((float)g_AllImgWrite / g_AllImgSize);
if (ioctl(DevInfo[i].fd, MEMERASE, &erase) < )
{
DEBUG("\n");
DEBUG("While erasing blocks 0x%.8x-0x%.8x on %s\n",\
(unsigned int) erase.start, (unsigned int) (erase.start + erase.length), DevInfo[i].dir);
/*return "Error while erasing blocks";*/
return ;
}
g_AllImgWrite += erase.length;
erase.start += mtd.erasesize;
}
printf("\n\rErased blocks: %d/%d (100%%)\n", blocks, blocks); /**
* 再进行写操作
*/
printf ("\nbegin to write block %s\n\n", DevInfo[i].dir);
g_AllImgWrite = ;
k = BUFSIZE;
while (size)
{
if (size < BUFSIZE)
{
k = size;
}
printf("\033[1A");
printf("\r%s usage: %dk/%dk (%d%%)\n",\
DevInfo[i].dir, KB (g_AllImgWrite + k), KB (DevInfo[i].size), (int)PERCENTAGE (g_AllImgWrite + k, DevInfo[i].size));
fprintf(stderr, "Writing data: %dk/%ldk (%d%%)", KB (written + k), KB (StateOfImage.st_size), (int)PERCENTAGE (written + k, StateOfImage.st_size));
result = write(DevInfo[i].fd, &upPack[written], k);
if (k != result)
{
DEBUG ("\n");
if (result < )
{
DEBUG("While writing data to 0x%.8x-0x%.8x on %s\n", written, written + k, DevInfo[i].dir);
return ;
}
DEBUG("Short write count returned while writing to x%.8x-0x%.8x on %s: %d/%d bytes written to flash\n", \
written,written + k, DevInfo[i].dir, written + result, DevInfo[i].size);
return ;
} written += k;
size -= k; g_AllImgWrite += k;
if(g_AllImgWrite >= DevInfo[i].size)
{
g_AllImgWrite = ;
printf("\n");
break;
} }
printf("Wrote %d / %ldk bytes\n", written, (unsigned long int)(StateOfImage.st_size)); } munmap(upPack, UPGRADE_SHM_SIZE);
for(i=; i<DevNum; i++)
{
close (DevInfo[i].fd);
printf("%s is closed!\n",DevInfo[i].dir);
} return ;
}