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70 lines
2.3 KiB
Markdown
70 lines
2.3 KiB
Markdown
# Fixing SMBus support
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This section of the guide refers to fixing AppleSMBus support in macOS, what is AppleSMBus? Well this mainly handles the System Management Bus, which has many functions like:
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* AppleSMBusController
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* Aids with correct temperature, fan, voltage, ICH, etc readings
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* AppleSMBusPCI
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* Same idea as AppleSMBusController except for low bandwidth PCI devices
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* Memory Reporting
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* Aids in proper memory reporting and can aid in getting better kernel panic details if memory related
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* Other things SMBus does: [SMBus wiki](https://en.wikipedia.org/wiki/System_Management_Bus)
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For install purposes, this SSDT isn't needed but for post-install it's recommended to put the final touches on your hack.
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So to get started, we'll want to grab our SMBus SSDT:
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* [SSDT-SBUS-MCHC.dsl](https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-SBUS-MCHC.dsl)
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So the important parts we care about are:
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```text
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External (_SB_.PCI0, DeviceObj) <- Rename this
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External (_SB_.PCI0.SBUS.BUS0, DeviceObj) <- Rename this
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Scope (_SB.PCI0) <- Rename this
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{
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Device (MCHC)
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{
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Name (_ADR, Zero) // _ADR: Address
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}
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}
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Device (_SB.PCI0.SBUS.BUS0) <- Rename this
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```
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To find the correct pathing for your devices, grab [Hackintool](https://www.tonymacx86.com/threads/release-hackintool-v3-x-x.254559/) ([Github link](https://github.com/headkaze/Hackintool)) and head to the PCI tab:
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Look for the SMBus device under Subclass, then look beside and you'll see the ACPI path(under IOReg Name). To convert , omit `@...`
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* `/PC00@0/SMBS@1F,4` -> `PC00.SMBS`
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Once finished, it'll look something like this:
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```text
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External (_SB_.PC00, DeviceObj) <- Renamed
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External (_SB_.PC00.SMBS.BUS0, DeviceObj) <- Renamed
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Scope (_SB.PC00)
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{
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Device (MCHC)
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{
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Name (_ADR, Zero) // _ADR: Address
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}
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}
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Device (_SB.PC00.SMBS.BUS0) <- Renamed
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```
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For those having issues, you can also check Device Manager -> CPU -> BIOS device Name
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**Note**: The MCHC is actually the DRAM controller, similar idea to SMBus for fixing memory reporting
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## [Now you're ready to compile the SSDT!](/Manual/compile.md) |