DM6467T LINUX BOOT WITH JFFS2 Process

Hello,

You can try the following:

First, boot linux using some convinient rootfs like NFS. Then, flash NAND JFFS2 from kernel:

flash_eraseall -j /dev/mtd3
mkdir /mnt/nand
mount -t jffs2 /dev/mtdblock3 /mnt/nand
cd /mnt/nand
tar -xf <flash-filesystem.tar>
umount /mnt/nand

Now, boot from this mtdblock by setting bootargs correctly from U-Boot:

setenv bootargs 'mem=116M console=ttyS0,115200n8 root=/dev/mtdblock3 rw rootfstype=jffs2 ip=dhcp'

Thanks,

Sekhar

Hi,

I'm trying to follow your indications to write a filesystem into the flash, but I find an error while mounting the jffs2 filesystem:

The command returns (after a long while) the following message:

root@dm6467t-evm:/opt# mount -t jffs2 /dev/mtdblock3 /mnt/nand
mount: mounting /dev/mtdblock3 on /mnt/nand failed: Input/output error

And the remote console shows the following:

...

...

Empty flash at 0x0798d034 ends at 0x0798f000
Empty flash at 0x0798f034 ends at 0x07990000
Empty flash at 0x07990034 ends at 0x07992000
Empty flash at 0x07992034 ends at 0x07993000
Empty flash at 0x07993034 ends at 0x07994000
Empty flash at 0x07994034 ends at 0x07995800
Empty flash at 0x07995834 ends at 0x07996800
Empty flash at 0x07996834 ends at 0x07997800
Empty flash at 0x07997834 ends at 0x07998800
Empty flash at 0x07998834 ends at 0x07999800
Empty flash at 0x07999834 ends at 0x0799b000
Empty flash at 0x0799b034 ends at 0x0799c000
Empty flash at 0x0799c034 ends at 0x0799e000
Empty flash at 0x0799e034 ends at 0x0799f800
Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes
empty_blocks 0, bad_blocks 358, c->nr_blocks 981

What does it mean? What can I do to solve it and step further?

Thanks!

P.D.: The flash_eraseall command ended like this:

...

Erasing 128 Kibyte @ 7900000 -- 98 % complete. Cleanmarker written at 7900000.
Skipping bad block at 0x07920000
Erasing 128 Kibyte @ 7940000 -- 98 % complete. Cleanmarker written at 7940000.
Skipping bad block at 0x07960000
Erasing 128 Kibyte @ 79a0000 -- 99 % complete. Cleanmarker written at 79a0000.
Skipping bad block at 0x079c0000
Erasing 128 Kibyte @ 79e0000 -- 99 % complete. Cleanmarker written at 79e0000.
Skipping bad block at 0x07a00000
Erasing 128 Kibyte @ 7a40000 -- 99 % complete. Cleanmarker written at 7a40000.
Skipping bad block at 0x07a60000
Erasing 128 Kibyte @ 7aa0000 -- 100 % complete.Cleanmarker written at 7a80000.

What I understand is that it means the command has ended ok.

Gerard,

Are you sure that what you have in Flash is a valid JFFS2 file system?
You might want to double check that.

Additionally the kernel need to be enabled to support it.

The following Twiki page should help even if it is not directly targeting DM6467:
           http://processors.wiki.ti.com/index.php/Category:File_system
see Filesystem_in_NOR_or_NAND,  Create a JFFS2 Target Image, Put JFFS2 Image to Flash

Hi,

Now everything works ok. To solve, I've done an install from scratch of the DVSDK, because I had

the kernel configurations cluttered with changes. Then, I've followed the Twiki pages indications, and

finally got the nand flash correctly written.

Thanks for your advices!

Regards,

Gerard.

Hi,

I've got the same problem.

I can't successfully write a file system image in nand because there are too many bad sectors and it's size is too large too fit in

I've executed :nandtest

root@dm6467t-evm:~# nandtest /dev/mtd3
ECC corrections: 0
ECC failures   : 0
Bad blocks     : 441
BBT blocks     : 0
Bad block at 0x00000000
Bad block at 0x00020000
Bad block at 0x00040000
00060000: writing...
write: Input/output error
00080000: writing...
write: Input/output error
Bad block at 0x000a0000
000c0000: writing...
write: Input/output error

441 bad sectors seems to many to me. Maybe I had something wrong and nandwrite or flash_eraseall marked incorrecly some sectors as bad.

I can successfully write ubl, u-boot and the kernel image using sfh_dm646x utility and nand commands while in u-boot.

Any suggestions?? How I can erase the Bad sector table? Is that a good idea?