2008-08-27 09:53:00 mtdblock* access problem

Zhi Qiang Zhang (CHINA)

Message: 61178

Hi,

I want my device can be updated by external stored file, so I created 2 partitions in my device, one is the u-boot partition, another is the kernel partition, this partition begin at 0x20040000 to end of the flash.

After I rebuild the kernel image, I copy it to a SD card, then mout this SD card to my device, then run this command will update the kernel

cat /mnt/uImage.initramfs > /dev/mtdblock1

Now I want to create a program to do this,

int fd_img, fd_mtd;

fd_img = open("/mnt/uImage.initramfs", O_RDONLY);

fd_mtd = open("/dev/mtdblock1", O_WRONLY);

unsigned char buf[4096];

int r;

do {

r = read(fd_img, buf, 4096);

write(fd_mtd, buf, r);

} while (r != 0);

close(fd_img);

close(fd_mtd);

run this program to update the kerenl, and reboot, the u-boot prompts that "CRC error"

what is this program different from 'cat /mnt/uImage.initramfs > /dev/mtdblock1"?

Regards,

ZhangZQ

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2008-08-27 16:14:57 Re: mtdblock* access problem

Mike Frysinger (UNITED STATES)

Message: 61192

you cant write mtdblock devices directly. they're flash, so you need to erase things before you program. use the programs with mtd-utils to manage things.

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2008-08-27 18:51:30 Re: mtdblock* access problem

Zhi Qiang Zhang (CHINA)

Message: 61206

Mike,

I can use 'cat /mnt/uImage.initramfs > /dev/mtdblock1' to update the flash without erase the flash first, it is OK, what is the problem?

Regards,

ZhangZQ

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2008-08-29 01:32:45 Re: mtdblock* access problem

Zhi Qiang Zhang (CHINA)

Message: 61308