Thomas Gleixner wrote:
> On Thu, 2004-12-02 at 16:19 +1100, Aras Vaichas wrote:
> 
>>Hello all,
>>
>>I have managed to get the latest MTD code to compile with a 2.4.27-vrs1 kernel. 
>>I compiled the latest YAFFS code (from CVS) into the kernel. I mounted a 16MB 
>>block of Smartmedia NAND and tried to create some files, I got a load of errors 
>>, I reset the machine because it was obviously going crazy. I then noticed that 
>>my NAND suddenly had a load of "bad blocks"
> 
> Obviously some errors resulted in marking the blocks bad.
> 
> Can you first verify that your driver works correctly without a
> filesystem ? Use nandwrite to write a file to the chip and nanddump to
> read it back.

hmm, it *sort* of works, but it looks like there is corruption.


nandtest # echo "Hello World! 
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" > text.orig && 
nandwrite -a -p /dev/mtd/4 text.orig
MTD_open
MTD_ioctl
MTD_ioctl
WriMTD_ioctl
tinand_isbad_bbt(): bbt info for offs 0x00000000: (block 0) 0x00
ng data to block 0
MTD_write
nand_write_ecc: to = 0x00000000, len = 512
MTD_close
nand_sync: called
nandtest # nanddump /dev/mtd/4 text.out 0 512 && cat text.out
MTD_open
MTD_ioctl
Would you like formatted output? n
DumMTD_read
pnand_read_ecc: from = 0x00000000, len = 512
ing nand_read_ecc: Failed ECC read, page 0x00000000
data starting at 0x00000000 and ending at 0x00000200.MTD_ioctl
..nand_read_oob: from = 0x00000000, len = 16

Dumping 0
MTD_close
nand_sync: called
Hello World AC@A@@@@
LMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789
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nandtest #


nandtest # mtd_debug info /dev/mtd/4
MTD_open
MTD_ioctl
MTD_ioctl
mtd.type =MTD_close
  nand_sync: called
MTD_NANDFLASH
mtd.flags = MTD_CLEAR_BITS | MTD_ERASEABLE | MTD_OOB | MTD_ECC
mtd.size = 16777216 (16M)
mtd.erasesize = 16384 (16K)
mtd.oobblock = 512
mtd.oobsize = 16
mtd.ecctype = MTD_ECC_NONE
regions = 0