On Wednesday 14 September 2011 22:41:50 厦清 wrote:
> hi guys:
> I use lastest yaffs filesystem,kernel is 2.6.25. my nand flash controller
> driver is Freescale Enhanced Local Bus Controller NAND driver.and when i
> copy(or ls) files(more than 1MB?),the console appears:**>> yaffs chunk
> 62720 was not erased **>> yaffs chunk 62784 was not erased **>> yaffs chunk
> 62848 was not erased **>> yaffs chunk 62912 was not erased **>> yaffs write
> required 321 attemptsso why this happens continually ?

This most likely means tha t the flash has been used for some other purpose 
and the main data area contains data while the spare/oob area is erased.

Try erasing the flash first.