From: Duy Thang Dao <dthang_dao@yahoo.com>
Subject: Về: [Yaffs] A Three YEARs Problem!!!-----Can not see file afterwrite yaffs2 image on NAND
To: "yichia lan" <lanyichia@yahoo.com>
Cc: yaffs@lists.aleph1.co.uk
Date: Monday, November 2, 2009, 1:18 AM

Hi,
You should look into the kernel source code to find the solution. For example, I am using linux kernel 2.6.29.3. Come to driver/mtd/nand/,
and read into nand_base.c. You see that:

static struct nand_ecclayout nand_oob_64 = {
     .eccbytes = 24,
     .eccpos = {
            40, 41, 42, 43, 44, 45, 46, 47,
            48, 49, 50, 51, 52, 53, 54, 55,
            56, 57, 58, 59, 60, 61, 62, 63},
     .oobfree = {
         {.offset = 2,
          .length = 38}}
};

Is that your NAND which has 64 bytes in OOB ? And you are using this definition for your NAND ?
If the offset = 2  then you can be use command "mkyaffs2image  /tmp/test/ /tmp/yaffs2.img   2".
So offset = x, using:
mkyaffs2image  /tmp/test/ /tmp/yaffs2.img   x

Make clearly what is your definition of your NAND 's OBB.
Best, regard