Fixing NVRAM: Manual

• Finding the ACPI path
• Edits to the sample SSDT
• Compiling the SSDT
• Wrapping up

Finding the ACPI path

Finding the ACPI pathing is quite easy actually, first open your decompiled DSDT you got from Dumping the DSDT and Decompiling and Compiling with either MaciASL(if in macOS) or any other text editor if in Windows or Linux(VSCode has an ACPI extension (opens new window) that can also help).

Next, search for the following:

• Finding the LowPinCount path:
  • Search Name (_ADR, 0x001F0000)
• Finding the PCI path:
  • Search PNP0A08 (If multiple show up, use the first one)

You should get something like the following show up:

LPC Pathing	PCI Pathing

Now with the pathing, you can head here: Edits to the sample SSDT

Edits to the sample SSDT

Now that we have our ACPI path, lets grab our SSDT and get to work:

• SSDT-PMC.dsl (opens new window)

By default, this uses PCI0.LPCB for the pathing. you'll want to rename accordingly.

Following the example from above, we'll be renaming it to PCI0.LPC:

Before:

External (_SB_.PCI0.LPCB, DeviceObj) <- Rename this

Scope (_SB.PCI0.LPCB) <- Rename this

Following the example pathing we found, the SSDT should look something like this:

After:

External (_SB_.PCI0.LPC, DeviceObj) <- Renamed

Scope (_SB.PCI0.LPC) <- Renamed

Compiling the SSDT

With the SSDT done, you're now ready to compile the SSDT!

Wrapping up

Once you're done making your SSDT, either head to the next page to finish the rest of the SSDTs or head here if you're ready to wrap up:

• Cleanup