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Fixing buggy MAT Support

Problem

If you open this OpenCore DEBUG log and look for OCABC: MAT support you'll see that this laptop has MAT Support.

According to OpenCore Configuration.pdf, I had to edit config.plist/Booter/Quirks as it follows:

  • EnableWriteUnprotector set to False
  • ProtectUefiServices set to True (source)
  • RebuildAppleMemoryMap set to True
  • SyncRuntimePermissions set to True

Trying to to boot the laptop with the above quirks resulted in being stucked on [EB|#LOG:EXITBS:START].
This is due to the buggy firmware that this laptop has.

Solution

In order to fix this strange bug, I had to edit config.plist as it follows:

  • Booter/Quirks/DevirtualiseMmio = True
  • Booter/Quirks/EnableWriteUnprotector = True
  • Booter/Quirks/RebuildAppleMemoryMap = False
  • Booter/Quirks/SyncRuntimePermissions = False
  • Misc/Debug/Target = 67

With the above settings, I couldn't reach the OS, but I got the opencore-YYYY-MM-DD-hhmmss.txt which contained useful infos about MMIO Regions.

Below, the regions I extracted from the above file after looking for MMIO:

74:890 00:077 OCABC: MMIO devirt start
74:967 00:077 OCABC: MMIO devirt 0xE0000000 (0x10000 pages, 0x8000000000000000) skip 0
75:042 00:074 OCABC: MMIO devirt 0xFE000000 (0x11 pages, 0x8000000000000001) skip 0
75:118 00:075 OCABC: MMIO devirt 0xFEC00000 (0x1 pages, 0x8000000000000001) skip 0
75:195 00:077 OCABC: MMIO devirt 0xFEE00000 (0x1 pages, 0x800000000000100D) skip 0
75:273 00:077 OCABC: MMIO devirt 0xFF000000 (0x1000 pages, 0x800000000000100D) skip 1
75:348 00:074 OCABC: MMIO devirt end, saved 262220 KB

What I did is explained in this dortania's guide.
After doing so, I got the right region to add in config.plist/Booter/MmioWhitelist : 0xFF000000.

Doing this, granted me boot the laptop with the following config.plist edits:

  • Booter/Quirks/DevirtualiseMmio set to True
  • Booter/Quirks/EnableWriteUnprotector set to False
  • Booter/Quirks/RebuildAppleMemoryMap set to True
  • Booter/Quirks/SyncRuntimePermissions set to True
  • Booter/MmioWhitelist/0 set to:
    • Address = 4278190080
    • Comment = MMIO Devirt 0xFF000000
    • Enabled = True

Credits