I am now facing a problem that I want to use a specific ram address [0x0, 0x2000000), because there is a hareware on board using it, I have to write data to this specific ram region and my hareware will read this region to work.

I have moved foc kernel address to 0x2000000, and also used Attach_io_mem_dataspace to reflect physical address [0x0, 0x2000000) in my driver, but I failed to drive my hareware.

I guess maybe the data haven't been written to this ram region correctly. 

Is  Attach_io_mem_dataspace suitable for this case? If NOT, how can I do ?

Thanks.