/dev/mtdblock0 : No such device

/dev/mtdblock0 : No such device

[regigao]

Hi
I have a board with two Intel Flash E28F640.
The Flash mapping address starts from 0xff000000 to 0xffffffff
Each Flash is 8 MB , so the total size is 16 MB
I use kernel 2.4.18 , and enable the MTD options with
  CONFIG_MTD
  CONFIG_MTD_CHAR
  CONFIG_MTD_BLOCK
  CONFIG_MTD_CFI
  CONFIG_MTD_CFI_GEOMETRY
  CONFIG_MTD_CFI_B1
  CONFIG_MTD_CFI_I2
  CONFIG_MTD_CFI_INTELEXT
  CONFIG_MTD_PHYSMAP 
  CONFIG_MTD_PHYSMAP_START  ( 0xff000000 )
  CONFIG_MTD_PHYSMAP_LEN    ( 0x01000000 )
  CONFIG_MTD_PHYSMAP_BUSWIDTH  ( 1 )
I also enable the JFFS option in File systems
When I boot the kernel , I can see the detection message
  physmap flash device: 1000000 at ff000000
  Physically mapped flash: Found 1 x16 devices at 0x800000 in 8-bit mode
  mtd: Giving out device 0 to Physically mapped flash
I cat /proc/mtd and it shows the MTD device
  # cat /proc/mtd
  dev:    size   erasesize  name
  mtd0: 01000000 00020000 "Physically mapped flash"
Now I use mkfs.jffs to build a jffs image(img_file) and cp it to /dev/mtd0
  # cp img_file /dev/mtd0
But whenever I try to mount /dev/mtdblock0 , it shows No such device
  # mount -t jffs /dev/mtdblock0 tmp
  mount: Mounting /dev/mtdblock0 on /tmp/tmp failed: No such device
I am sure that I have the device file ( mtdblock0 ) in the /dev/
  # ls -la /dev/mtdblock0
brw-r--r--    1 root     root      31,   0 Dec 11  2001 /dev/mtdblock0

Does anyone have any suggestions about what I might be getting wrong ?
thanks !

  


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