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Getting Started With ACPI
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Decompiling and Compiling
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Disabling desktop dGPUs
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Embedded Controllers
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Backlight PNLF
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Trackpad GPI0
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Disabling laptop dGPUs
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Plugin type
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AWAC vs RTC
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NVRAM PMC
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IRQ Fix
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GPU Spoof
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Fixing SMBus Support
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Cleanup
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<!-- Title -->
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<h1>
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<a href=".." >Fixing SMBus Support</a>
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<section class="normal markdown-section">
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<h1 id="fixing-smbus-support">Fixing SMBus support</h1>
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<p>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:</p>
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<ul>
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<li>AppleSMBusController<ul>
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<li>Aids with correct temperature, fan, voltage, ICH, etc readings</li>
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</ul>
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</li>
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<li>AppleSMBusPCI<ul>
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<li>Same idea as AppleSMBusController except for low bandwidth PCI devices</li>
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</ul>
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</li>
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<li>Memory Reporting<ul>
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<li>Aids in proper memory reporting and can aid in getting better kernel panic details if memory related</li>
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</ul>
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</li>
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<li>Other things SMBus does: <a href="https://en.wikipedia.org/wiki/System_Management_Bus" target="_blank">SMBus wiki</a> </li>
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</ul>
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<p>For install purposes, this SSDT isn't needed but for post-install it's recommended to put the final touches on your hack.</p>
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<p>So to get started, we'll want to grab our SMBus SSDT:</p>
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<ul>
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<li><a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-SBUS-MCHC.dsl" target="_blank">SSDT-SBUS-MCHC.dsl</a></li>
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</ul>
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<p>So the important parts we care about are:</p>
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<pre><code class="lang-text">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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</code></pre>
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<p>To find the correct pathing for your devices, grab <a href="https://www.tonymacx86.com/threads/release-hackintool-v3-x-x.254559/" target="_blank">Hackintool</a> (<a href="https://github.com/headkaze/Hackintool" target="_blank">Github link</a>) and head to the PCI tab:</p>
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<p><img src="https://cdn.discordapp.com/attachments/683011276938543134/694592079728214024/Screen_Shot_2020-03-31_at_10.58.36_AM.png" alt=""></p>
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<p>Look for the SMBus device under Subclass, then look beside and you'll see the ACPI path(under IOReg Name). To convert , omit <code>@...</code></p>
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<ul>
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<li><code>/PC00@0/SMBS@1F,4</code> -> <code>PC00.SMBS</code></li>
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</ul>
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<p>Once finished, it'll look something like this:</p>
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<pre><code class="lang-text">External (_SB_.PC00, DeviceObj) <- Renamed
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External (_SB_.PC00.SMBS.BUS0, DeviceObj) <- Renamed
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/* <- Comment out if on Sandy Bridge or newer
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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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*/ <- Close the comment
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Device (_SB.PC00.SMBS.BUS0) <- Renamed
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</code></pre>
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<p><strong>Note</strong>: The MCHC is actually the DRAM controller, similar idea to SMBus for fixing memory reporting</p>
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<h2 id="now-youre-ready-to-compile-the-ssdt"><a href="../Manual/compile.html">Now you're ready to compile the SSDT!</a></h2>
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