Boards with bad NAND flash

[itouch]

I have 2 out of 3 boards which have errors when you run bon part 0 320k 2368K on them? What is your experience with bad NAND flash on your board?

[buserror]

"bad" nand is normal, it's really NAND, they guarantee the first block, but not the others -- thats why there are ECC (Error Correction Code) attached to each blocks, to be able to guarantee and (possibly) correct some of the bit errors.
if you use u-boot, you can write data in a "ecc friendly" that that will read & write data, skipping the bzf blocks automaticaly.