Tiny6410 : no space left on device

Hi, all.
I'm learning on tiny6410 board and working on Linux OS.

After so many times burning to test my board, Now I'm going to set some
files on it (such as test application / tslib ).

But! the board appear an error 
"cp: write error : No space left on device."
"cp: can't create '/usr/...': Cannot allocate memory"
Even I burn new Linux place on it, Can't fix.

Is it because there're old files from previous OS (Linux/WinCE/Ubuntu)
still on board's storage?

How can I fix it? Can I flush the device for burning new OS?

Thanks.

Should it be formatted ?
How can I do that?

There's really no space left.

Ps. for now I cannot use RS232 to connect device cause of using laptop.
Have only USB/LAN/SDCard.

Any suggestion ?

Maybe, link us to the instructions you are following to put the new image
into flash might help.  

Years ago I had to do a NAND scrub as put of the process, now with the way
the Pengutronix kernel and root file system are setup I just erase the old
kernel, ie:

sudo dd if=/dev/sdb? of=/dev/zero

then copy the new kernel using dd as well.

Are you using dd?

With installing new kernel I'm using superboot via SD.
It causes no error here.

But, my problem is for now my tiny's nand flash space used 250/250 Mb as
rep1's attachment.
So, I can't put my file to my tiny anymore.

Wanna know how to format nand flash without serial port connection.

Cause now I'm having a problem with the serial so much, I used
USB-to-serial and install all driver and my laptop saw the serial port
already.
But when I turned on the board (with FriendlyARM.ini set CheckOneButton=Yes
), there's nothing in serial terminal.

Is this board use cross serial cable?

I'm using
Laptop's USB port <-> USB-to-serial adapter <-> femail-femail straight
serial cable <-> Tiny6410's COM0

All I recall is that the RS232 cable for mini2440 and the mini6410 are
different.  Sorry, I can't say for certain which way it is.

Try searching the forum it was discussed quite often in the early days.

Didn't you get a RS232 cable in the kit?