Unlock 0xE2 MSR

Introduction

According to AptioFixPkg's README, "[c]ertain firmwares fail to properly initialize 0xE2 MSR register (MSR_BROADWELL_PKG_CST_CONFIG_CONTROL) across all the cores....

CFG Lock option is available on most APTIO V firmware, although it may be hidden from the GUI. If VerifyMsrE2 reports that your 0xE2 register is consistently locked, you may try to unlock this option directly."

How to Unlock

TM1701: Cyb and FallenChromium created script to unlock. Please download DVMT_and_0xE2_fix and read README to unlock.

TM1707: Use the configuration table with RU.efi to unlock CFG LOCK.

TM1905: Use the configuration table with RU.efi to unlock CFG LOCK.

After that, you should disable MSR 0xE2 patches.

• For Clover users, change the following code to disable MSR 0xE2 patch:

    <key>KernelPm</key>
-   <true/>
+   <false/>

• For OC users, change the following code to disable MSR 0xE2 patch:

    <key>AppleXcpmCfgLock</key>
-   <true/>
+   <false/>

Credits

• Acidanthera
  • AptioFixPkg
  • OpenCorePkg
• Cyb, FallenChromium, and goodyttoor for efforts on 8th Gen model
• htmambo for efforts on 10th Gen model