Can I update and save file when n2linux running?

Thanks hippo, I can r/w file on mtdblock0 and save it.

follow is my example:

1) crate a blank text file In ~/rootfs/etc . Rename the file to you wanted.

2)rebuild the zImage and reboot.

3)dd count=1 if=some_source_file of=/dev/mtdblock0

You have crated a jffs2 file after this step.

Then you can add c code as following demo code to your APP. So you can r/w and

save your jffs2 file. In jffs2 file you can save IP address, informaion,.........

# include <fcntl.h>

int main(void)

{

int ret;

int fd;

chdir("/");

char buffer[10] ={&#39;H&#39;,&#39;e&#39;,&#39;l&#39;,&#39;l&#39;,&#39;o&#39;,&#39;j&#39;,&#39;f&#39;,&#39;f&#39;,&#39;s&#39;,&#39;2&#39;};

ret = system("dd count=1 if=/dev/mtdblock0 of=test_config");

if((fd = open("test_config", O_WRONLY)) == -1)

{

printf("cannot open file. \n");

exit(1);

}

if(write(fd,buffer,10) != 10)

{

printf("write error");

}

fclose(fd);

ret = system("dd count=1 if=test_config of=/dev/mtdblock0");

return 0;

}