help me --- end_request: I/O error, dev 1f:02 (mtdblock), sector 32768

[modream]

Hello.
I am JUN from seoul Korea

I have any question for using flash filesystem(ext2).
 
I use intel assabet board.
and I used    kernel-2.4.1 
.                   patch-2.4.1-rmk1
.                   diff-2.4.1-rmk1-np2

and "make xconfig" checked
   Memory Technology Devices (MTD) 
         --->    Memory Technology Device (MTD) support  (*)               ----> check
                   and   other item check....

  File systems  
   Journalling Flash File System (JFFS) support (EXPERIMENTAL) (*)      ---->check
            -----------  this item is not relation to ext2 filesystem.

and kernel source modified.  
 linux/init/main.c                
 #ifdef CONFIG_MTD
  { "mtdblock", 0x1f00 },
  { "mtd2", 0x1f02 },               -------------------> add
 #endif

 linux/drivers/mtd/sa1100-flash.c
 static struct mtd_partition assabet_partitions[] = {
  { offset: 0,   size: 0x00040000,  },
  { offset: MTDPART_OFS_APPEND, size: 0x007c0000,  },           ------------->  modify
  { offset: MTDPART_OFS_APPEND, size: MTDPART_SIZ_FULL  }
 };

next, I compiled kernel
"make dep"
"make zImage"
"make modules"
"make modules_install"
 
and download kernel & ramdisk
after booting,  I try make filesystem.
 
"cat /proc/mtd"
      dev:    size   erasesize  name
      mtd0: 00040000 00040000 "<NULL>" 
      mtd1: 007c0000 00040000 "<NULL>"
      mtd2: 01800000 00040000 "<NULL>"
"mknod /dev/mtd2 b 31 2"
"mke2fs /dev/mtd2"

But not made filesystem with error.
message when make filesystem is:
 
#mke2fs /dev/mtd2
mke2fs 1.19, 13-Jul-2000 for EXT2 FS 0.5b, 95/08/09
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
6144 inodes, 24576 blocks
1228 blocks (5.00%) reserved for the super user
First data block=1
3 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks: 
8193

Writing inode tables: 0/31/32/3done                            
Writing superblocks and filesystem accounting information: 

mtdblock: erase of region [0x840000, 0x40000] on "<NULL>" failed
end_request: I/O error, dev 1f:02 (mtdblock), sector 32768
mtdblock: erase of region [0x840000, 0x40000] on "<NULL>" failed
end_request: I/O error, dev 1f:02 (mtdblock), sector 32776
.                                               .
.                                               .
.                                               .
.                                               .
mtdblock: erase of region [0x840000, 0x40000] on "<NULL>" failed
end_request: I/O error, dev 1f:02 (mtdblock), sector 32784
mtdblock: erase of region [0x840000, 0x40000] on "<NULL>" failed
end_request: I/O error, dev 1f:02 (mtdblock), sector 32792
 
What is problem?
I try kernel compile, modified and downloading in the last 4days.
But I don't making flash filesystem. 

please Help me.

I am sorry that my poor english.

Thank you for read this mail.
Best regard JUN.
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