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 attempts

so why this happens continually ?