combine 2 mtds into a single mtd device?

[mjabe at sina.com.tw]

The follow is my MTD partition:

 +-------------+             

 |    MTD1     | (size 3M)

 +-------------+

 | Bootloader  | (size 128K)

 +-------------+

 |    MTD2     | (size 3M)

 +-------------+

 |    MTD3     |

 +-------------+



How to combine MTD1 and MTD2 into a single mtd device?

So if I have a image(5M), wehn I do "dd" command, mtd driver

will copy 3M into MTD1 and copy 2M into MTD2.

Thanks.

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