Access mtdblock from a driver

[mike]

Dear all

    Could i access a mtdblock from a device driver? Or MTD provide me 
another interface for driver to access?

    Actually, i am under a situation that i have a development board 
with usb client, also it provide me a USB ram disk driver.
    I want to change it to be MTD access instead of sdram. I just can 
figure out two method, 1) USB ram disk driver access MTD function , 2) 
New Application program to act as the middle tier.

    please fix me if i am wrong

    Thanks for helping

Mike,Lee