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* Intel 300-series PMC support for macOS
* Starting from Z390 chipsets PMC (D31:F2) is only available through MMIO.
* Since there is no standard device for PMC in ACPI, Apple introduced its
* own naming "APP9876" to access this device from AppleIntelPCHPMC driver.
* To avoid confusion we disable this device for all other operating systems,
* as they normally use another non-standard device with "PNP0C02" HID and
* On certain implementations, including APTIO V, PMC initialisation is
* required for NVRAM access. Otherwise it will freeze in SMM mode.
* The reason for this is rather unclear. Note, that PMC and SPI are
* located in separate memory regions and PCHRESV maps both, yet only
* PMC region is used by AppleIntelPCHPMC:
* 0xFE000000~0xFE00FFFF - PMC MBAR
* 0xFE010000~0xFE010FFF - SPI BAR0
* 0xFE020000~0xFE035FFF - SerialIo BAR in ACPI mode
* PMC device has nothing to do to LPC bus, but is added to its scope for
* faster initialisation. If we add it to PCI0, where it normally exists,
* it will start in the end of PCI configuration, which is too late for
* NVRAM support.
DefinitionBlock ("", "SSDT", 2, "ACDT", "PMCR", 0x00001000)
External (_SB_.PCI0.LPCB, DeviceObj)
Scope (_SB.PCI0.LPCB)
Device (PMCR)
Name (_HID, EisaId ("APP9876")) // _HID: Hardware ID
Method (_STA, 0, NotSerialized) // _STA: Status
If (_OSI ("Darwin"))
Return (0x0B)
Return (Zero)
Name (_CRS, ResourceTemplate () // _CRS: Current Resource Settings
Memory32Fixed (ReadWrite,
0xFE000000, // Address Base
0x00010000, // Address Length
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