On Friday 19 January 2007 13:25, howhowwork wrote:
> Hi ,
>
>  I have mips board au1200 with a Samsung K9f1208V 64MB NAND flash which
> is 528bytes/page and nor flash with 32M.  i have established a jffs2
> filesystem as root filesystem in nor flash with 32M ,my sytem is ok if only
> use nor flash . now i plan to mount nand flash under jffs2 filesystem . I
> downloaded the newest yaffs2 code from
> "http://www.aleph1.co.uk/cgi-bin/viewcvs.cgi/yaffs" and place it to linux
> kernel 2.6.11. I select yafss and mtd support from muneconfig. After make,
> I got the error messages
> at the end:
>
>  all of transport is passed
>
> 1. i boot my board using jffs2 filesystem as root filesystem
>  # cat /proc/mtd
>  dev:    size   erasesize  name
>  mtd0: 03c00000 00020000 "User11 FS"
>  mtd1: 00100000 00020000 "YAMON"
>  mtd2: 002c0000 00020000 "raw kernel"
>  mtd3: 00800000 00004000 "NAND FSa 0"
>  mtd4: 03800000 00004000 "NAND FSa 1"
>
>  2. using the tools "flash_eraseall /dev/mtd6 ",passed
>
>  3. # mount -tyaffs /dev/mtdblock4 /mnt/
>  yaffs: dev is 32505860 name is "mtdblock4"
>  yaffs: Attempting MTD mount on 31.4, "mtdblock4"
>
> 4. then there are erros when copying  data to mnt's directory
>    the questions :
>  when copy less 120k data , no errors,and the data is correct after i
> reboot however , copying more 100k data ,there are the following errors:
> .........................................
>  **>>mtd ecc error unfixed on chunk 113984:0
>  **>>mtd ecc error unfixed on chunk 113984:1
>  **>>Block 3562 marked for retirement
>  **>> yaffs chunk 114016 was not erased
>  **>> Erasure failed 3563
>  **>> Block 3563 retired
>  ......
>  **>> yaffs chunk 416 was not erased
>  **>> Erasure failed 13
>  ......
>  yaffs tragedy: no more eraased blocks
>  !!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!
>  ......
>  **>>mtd ecc error unfixed on chunk 1375:0
>  **>>mtd ecc error unfixed on chunk 1375:1
>  **>>Block 42 marked for retirement
>  yaffs tragedy: no more eraased blocks
>  !!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!
>  .........................................
>  then i try to exc command "df"
>  /mnt # df
>  Filesystem           1k-blocks      Used Available Use% Mounted on
>  /dev/mtdblock0           61440     27308     34132  44% /
>  tmpfs                      512        60       452  12% /var
>  /dev/loop1                1244      1244         0 100% /root/test
>  /dev/mtdblock4           57344     57344         0 100% /mnt
>
>  exc command  "reboot"
>  /mnt #df
>  Filesystem           1k-blocks      Used Available Use% Mounted on
>  /dev/mtdblock0           61440     27308     34132  44% /
>  tmpfs                      512        60       452  12% /var
>  /dev/loop1                1244      1244         0 100% /root/test
>  /dev/mtdblock4           57344     57344         0 2% /mnt
>
>  why ...
>  what is somthing wrong ?

You are getting some ecc errors, most likely because your oob-area data 
placement is conflicting with the way your nand driver is working.

I suggest having a very good look at usgae of the oob bytes and looking for 
any conflicts.

>
>
>  according to some suggustion ,    I changed my oob placement as following
> :
>
>   /* Define default oob placement schemes for large and small page devices
> */ static struct nand_oobinfo nand_oob_8 = {
>         .useecc = MTD_NANDECC_AUTOPLACE,
>         .eccbytes = 3,
>         .eccpos = {0, 1, 2},
>         .oobfree = { {3, 2}, {6, 2} }
> };
>
> static struct nand_oobinfo nand_oob_16 = {
>         .useecc = MTD_NANDECC_AUTOPLACE,
>         .eccbytes = 6,
>         .eccpos = {0, 1, 2, 3, 6, 7},
>         .oobfree = { {8, 8} }
> };
>
> static struct nand_oobinfo nand_oob_64 = {
>         .useecc = MTD_NANDECC_AUTOPLACE,
>         .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 = { {2, 38} }
> };
>  --------------------------------------------------------------------------
>
>  While oob placements definition in yaffs_mtdif.c
>
>  static struct nand_oobinfo yaffs_oobinfo = {
>  .useecc = 1,
>  .eccbytes = 6,
>  .eccpos = {8, 9, 10, 13, 14, 15}
> };
>
>  then i change the struct " nand_oobinfo nand_oob_16" into
>  static struct nand_oobinfo nand_oob_16 = {
>  .useecc = 1,
>  .eccbytes = 6,
>  .eccpos = {8, 9, 10, 13, 14, 15},
> };
>
> but the errors is the same as before.  Anyclues what
> could be wrong ..
> Any help will be highly appreciated.
>
>
>  regards
>
> please help me out ...
>
>
>
>
> howhowwork
> 2007-01-15