Re: [Yaffs] BadBlock in YAFFS2

On Sun, May 31, 2009 at 7:47 PM, Michaela Mücke <msmuecke@gmx.de> wrote:
> Hi all,
> iam Michaela and iam a young Student from Germany (Ulm).
> Iam writing my Diploma work about YAFFS2 to integrate in the
> real time operation system INTEGRITY-178B from Greenhills.
> I have four NAND chips K9K4G08U0M from Samsung, which are
> complete one Device.
> I think i understand this main working about yaffs2 but iam a little
> bit confuse about how to mark bad blocks. Is it a real mark on the

There are bad block marks on individual chips. Since you have a device
which integrates four NAND chips, there could be extra information on
the device, so check the device data sheet.

> chip like yaffs1 or is it only a intern thing from yaffs2 ? I have this

It's related to the NAND flash, not an invention of Yaffs*.

> PackedTags2 with fields SequenceNumber, ObjectID, ChunkID and
> byteCount but where is this field for state??
> So what i have to do exactly in this function  markNANDBlockBad?
> Real Byte set on the device or only change this variable state of this
> block?

It should call a MTD layer function, which in turn sets the bad block
mark on the NAND flash (or maybe BBT - check the code yourself!).

> A other question is, i read YAFFS2 need this Block 0 for intern works.

really? I guess this internalStartBlock and StartBlock thing really
confuses you and me, maybe someone else here can explain this:)

> So what exactly yaffs safe in this block?
> Thanks very much !!
>
>
> BR
> Michaela
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>
Rong