>>> However, I get these kernel messages (alot) whenever I try to 
>>> read/write anything:
>>>
>>> === 8< 8< 8< ===
>>>    Writing data without ECC to NAND-FLASH is not recommended
>>>    Writing data without ECC to NAND-FLASH is not recommended
>>>    Writing data without ECC to NAND-FLASH is not recommended
>>>    Writing data without ECC to NAND-FLASH is not recommended
>>>    Reading data from NAND FLASH without ECC is not recommended
>>>
>>> I guess these must be from YAFFS...
>> No, that is normal. If MTD is asked not to do its own ECC it whinges 
>> like mad. Comment it out.
> Ok...

>>> Is there really no ECC running now? I thought that config-option for 
>>> MTD did the job?
>>
>> You should only do this if yaffs is doing the ECC instead.
> So, this is how I have the configuration in order to get it to work:
> 
> YAFFS_USE_NANDECC=n
> CONFIG_MTD_NAND_VERIFY_WRITE=y
> 
> My questions now are then:
> 1) Is there any ECC enabled now?
> 2) If I do the above, is there any difference in using the "-e" option 
> on "mkyaffs" when formatting the device (mkyaffs -e /dev/mtd0) - or is 
> this option only used when writing an image?

FYI: I tried with the newest CVS HEAD of MTD - same problem (it figures!?!)
Still wondering if ECC is enabled internally in YAFFS - /proc/yaffs says 
useNANDECC = 0?

// Martin