To modify MCTRL.SPDDIS of Intel Denvertion in coreboot

[Hilbert Tu(杜睿哲_Pegatron)]

Hi,
Is there anyone can tell me how to change MCTRL.SPDDIS in Coreboot?

The Intel Denverton blocks write permission to address A0~AE due to security concern of DIMM SPD, but this also restricts the write access to generic EEPROM access in our platform. So I need to modify the SPDDIS bit to bypass the protection. But I don’t know how to do that in Coreboot. Please help and thanks in advance.

-Hilbert
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