A question on ECC
Edward J. Lee
noshel at idis.co.kr
Mon Apr 14 13:40:05 EDT 2003
Thomas Gleixner wrote:
>On Monday 14 April 2003 07:13, Edward Lee (???) wrote:
>>Hi Earl, thanks for the help.
>>I didn't use nandwrite, I wrote on the chip using plain stuff like 'cp' or
>>'tar', etc. (having a file system on my device, I couldn't find a reason
>>to write files using other programs)
>nandwrite is just used to copy a filesystem image to a unformatted chip.
>If you have mounted the fs already, then nandwrite would be the wrong tool.
>These messages have a different reason. I assume that you followed the advice
>on yaffs list and you have enabled YAFFS_USE_NANDECC and disabled
>Then I can only guess, that you did not select a ecc mode in your board driver
> /* 20 us command delay time */
> this->chip_delay = 20;
> this->eccmode = NAND_ECC_SOFT;
>NAND_ECC_SOFT is the right choice, if you don't have a hardware ecc generator.
>If you have one, you must supply the neccecary functions to use it.
this->eccmode is indeed set to NAND_ECC_SOFT.
I guess my case is kind of 'extra-tricky'. I just found out another
that the warning messages complaining '...without ECC...' do NOT appear when
I'm 'writing' on the chip. Strange, eh. :'(
More information about the linux-mtd