This message was posted on behalf of Intel Corporation
We’ll be more than glad to help you with this.
I’m wondering if you have consider trying with Fast Memory Mapped IO. I would suggest you to check the following link http://www.i-programmer.info/programming/hardware/8770-exploring-edison-fast-memory-mapped-io.html, it explains how it works and offers some examples to implement it. Hopefully you’ll get better results with this.
Let us know if it works.