CSM doesn't do the hard and machine-specific work that's needed here. http://uefidk.intel.com/content/minnowboard-uefi-firmware-eula states that "The CPU and chipset initialization code is currently provided as a binary module" which is consistent with usual Intel support for coreboot (MRC, FSP) and makes it useless without hard reverse engineering work. I don't know if it has signed blobs like most Intel devices have.
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