Yaffs2 on None-ECC MTD

richard -rw- weinberger richard.weinberger at gmail.com
Sat Aug 17 11:43:56 EDT 2013

On Sat, Aug 17, 2013 at 2:37 PM, Woody Wu <narkewoody at gmail.com> wrote:
> On Sat, Aug 17, 2013 at 12:58:41PM +0200, richard -rw- weinberger wrote:
>> On Sat, Aug 17, 2013 at 10:28 AM, Woody Wu <narkewoody at gmail.com> wrote:
>> > Hi,
>> >
>> > Does Yaffs2 file system has its own capabilities to do ECC? My NAND
>> > driver for some reason cannot enable ECC yet.  Also I want to ask the
>> > same question to Jffs2.
>> The Linux MTD subsystem is able to do software ECC.
> By far, I cannot enable any kind of ECC from MTD yet, since my u-boot
> has some problem cannot do correct ECC and my root file system image is
> flashed by u-boot. If I enabled ECC from MTD, my root file system cannot
> mount.

Then fix your uboot. Or at least hire someone to do so.
Otherwise you *will* encounter massive problems.

> Do you know whethe Yaffs2/Jffs2 has their own build-in ECC function?
> Googled this but not get clear answer.

IIRC yaffs2 has it's own ECC stuff. It writes into the spare area which is
a no-go and one of the reasons why it's not mainline.


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