linux 下对 flash 设备操作的应用程序（嵌入式参考用）

linux下对dataflash设备操作（擦除、写入文件）的应用程序，注意，所有的操作必须要使用mtdx的字符设备。

放出这个程序，帮助大家理解一些mtdchar的字符设备驱动！

#include <unistd.h>

#include <stdlib.h>

#include <stdio.h>

#include <fcntl.h>

#include <time.h>

#include <sys/ioctl.h>

#include <sys/mount.h>

#include <linux/compiler.h>

#include <mtd/mtd-user.h>

int non_region_erase(int Fd, int start, int count, int unlock)

{

mtd_info_t meminfo;

if (ioctl(Fd,MEMGETINFO,&meminfo) == 0)

{

erase_info_t erase;

erase.start = start;

erase.length = meminfo.erasesize;

for (; count > 0; count--) {

printf("/rPerforming Flash Erase of length %u at offset 0x%x",

erase.length, erase.start);

fflush(stdout);

if(unlock != 0)

{

//Unlock the sector first.

printf("/rPerforming Flash unlock at offset 0x%x",erase.start);

if(ioctl(Fd, MEMUNLOCK, &erase) != 0)

{

perror("/nMTD Unlock failure");

close(Fd);

return 8;

}

}

if (ioctl(Fd,MEMERASE,&erase) != 0)

{

perror("/nMTD Erase failure");

close(Fd);

return 8;

}

erase.start += meminfo.erasesize;

}

printf(" done/n");

}

return 0;

}

int main(int argc, char *argv[])

{

int fd,ifd;

int i,j;

char *cmd;

char *img;

struct mtd_info_user info;

int regcount;

int res = 0,cnt,write_cnt;

int imglen,imglen1;

int readlen=0;

char *write_buf;

if(3>argc)

{

printf("You must specify a device!/n");

return 16;

}

cmd=argv[1];

if (argc > 3)

{

img=argv[3];

}

// Open and size the device

if ((fd = open(argv[2],O_RDWR)) < 0)

{

fprintf(stderr,"File open error/n");

return 8;

}

else

{

ioctl(fd,MEMGETINFO,&info);

printf("info.size=%d/n info.erasesize=%d/n info.writesize=%d/n info.oobsize=%d /n",info.size,info.erasesize,info.writesize,info.oobsize);

}

if (ioctl(fd,MEMGETREGIONCOUNT,®count) == 0)

{

printf("regcount=%d/n",regcount);

}

/*erase the device*/

if (strcmp(cmd, "erase") == 0)

{

if(regcount == 0)

{

res = non_region_erase(fd,0,(info.size/info.erasesize),0);

}

printf("erase!/n");

}

/*write file to this device*/

if (strcmp(cmd, "write") == 0)

{

printf("write!/n");

if((ifd=open(img,O_RDONLY))==-1)

{

printf("open input file error!/n");

return 9;

}

else

{

imglen=lseek(ifd,0,SEEK_END);

lseek(ifd,0,SEEK_SET);

printf("The input file image len is %d!/n",imglen);

}

readlen=info.writesize;

write_buf=malloc(readlen);

if(write_buf==NULL)

{

printf("can't allocate memory!/n");

return 10;

}

else

printf("Write buf is ok!/n");

imglen1=imglen;

while(imglen)

{

memset(write_buf,0xff,readlen);

if((cnt=read(ifd,write_buf,readlen))!=readlen)

{

if(cnt<readlen)

printf("the file is end!/n");

else

{

printf("File I/O error on input file");

return 11;

}

}

if((write_cnt=write(fd,write_buf,readlen))!=readlen)

{

printf("write mtd device error! startaddr=%d/n",(imglen1-imglen));

return 12;

}

else

printf("/rwrite mtd device ok!startaddr=%d",(imglen1-imglen));

imglen-=cnt;

}

printf("/n");

return 0;

}

if (strcmp(cmd, "read") == 0)

{

printf("read!/n");

}

return 1;

}

命令格式：

擦除命令：

dataflash_ioctl erase /dev/mtd6

info.size=1968384

info.erasesize=528

info.writesize=528

info.oobsize=0

regcount=0

Performing Flash Erase of length 528 at offset 0x1e06f0 done

erase!

写入文件命令：

dataflash_ioctl write /dev/mtd6 /modules/uImage2.6.21

info.size=1968384

info.erasesize=528

info.writesize=528

info.oobsize=0

regcount=0

write!

The input file image len is 1406740!

Write buf is ok!

write mtd device ok!startaddr=1406064the file is write ok!

write mtd device ok!startaddr=1406592

修改u-boot的启动参数

cp.b d023f700 20400000 158000

其中d023f700是mtd6在flash中，u-boot识别的地址，20400000是内存地址,0x158000是长度！