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AWAC vs RTC
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Fixing SMBus Support
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >AWAC vs RTC</a>
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</h1>
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<blockquote>
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<p><em>Last modified: Mon May 04 2020 23:16:15 GMT+0000 (Coordinated Universal Time)</em></p>
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</blockquote>
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<h1 id="fixing-system-clocks"><a name="fixing-system-clocks" class="plugin-anchor" href="#fixing-system-clocks"><i class="fa fa-link" aria-hidden="true"></i></a>Fixing System Clocks</h1>
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<p><strong>For Intel 300 series chipsets and newer</strong>, this also includes X299 refreshes and Icelake laptops. Common machines:</p>
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<ul>
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<li>X299X (10th Gen refresh)</li>
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<li>B360</li>
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<li>B365</li>
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<li>H310</li>
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<li>H370</li>
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<li>Z370 (Gigabyte and AsRock boards with newer BIOS versions)</li>
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<li>Z390</li>
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<li>400 series (Cometlake)</li>
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<li>495 series (Icelake)</li>
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</ul>
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<p>So on newer Intel 300 series motherboards, manufactures started pushing for a new type of system clock: <strong>AWAC</strong>( <strong>A</strong> <strong>W</strong>eird <strong>A</strong>ss <strong>C</strong>lock). One small problem, macOS doesn't know what the hell an AWAC clock is instead only familiar with the legacy <strong>RTC</strong>(<strong>R</strong>eal <strong>T</strong>ime <strong>C</strong>lock). So we need to figure out how to bring back the old clock, thats where <code>SSDT-AWAC</code> and <code>SSDT-RTC0</code> come in:</p>
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<ul>
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<li><p><a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl" target="_blank">SSDT-AWAC</a></p>
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<ul>
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<li>Disables AWAC and enables RTC</li>
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<li>In your DSDT, there's a variable called <code>STAS</code> used for holding either a <code>One</code> or <code>Zero</code> to determine which clock to use(<code>One</code> for RTC and <code>Zero</code> for AWAC)</li>
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</ul>
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</li>
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<li><p><a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl" target="_blank">SSDT-RTC0</a></p>
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<ul>
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<li>Used for creating a fake RTC device for macOS to play with</li>
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<li>In very rare circumstances, some DSDTs may not have a legacy RTC to fall back on. When this happens, we'll want to create a fake device to make macOS happy</li>
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</ul>
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</li>
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</ul>
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<p>Note: AWAC actually stands for ACPI Wake Alarm Counter/Clock for those curious, though I'll forever know it as A Weird Ass Clock ;p</p>
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<h2 id="determining-which-ssdt-you-need"><a name="determining-which-ssdt-you-need" class="plugin-anchor" href="#determining-which-ssdt-you-need"><i class="fa fa-link" aria-hidden="true"></i></a>Determining which SSDT you need</h2>
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<p>To determine whether you need <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl" target="_blank">SSDT-AWAC</a> or <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl" target="_blank">SSDT-RTC0</a>:</p>
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<ul>
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<li>open your decompiled DSDT and search for <code>Device (AWAC)</code></li>
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<li>If <strong>nothing shows up</strong> then no need to continue and <strong>no need for this SSDT</strong> as you have no AWAC. <strong>Otherwise, continue on!</strong></li>
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<li>If you get a result then you have an <code>AWAC</code> system clock present, then continue with the <strong>next search for <code>STAS</code></strong>:</li>
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</ul>
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<p><img src="../images/Universal/awac-md/stas.png" alt=""></p>
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<p>As you can see we found the <code>STAS</code> in our DSDT, this means we're able to force enable our Legacy RTC. In this case, <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-AWAC.dsl" target="_blank">SSDT-AWAC</a> will be used As-Is with no modifications required. Just need to compile. Note that <code>STAS</code> may be found in AWAC first instead of RTC like in our example, this is normal.</p>
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<p>For systems where <strong>no <code>STAS</code></strong> shows up <strong>but</strong> you do have <code>AWAC</code>, you can use <a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0.dsl" target="_blank">SSDT-RTC0</a> though you will need to check the naming of LPC in your DSDT</p>
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<p>By default the SSDT uses <code>LPCB</code>, you can check what your system uses by just searching for <code>Name (_ADR, 0x001F0000)</code>. This address is used for Low Pin Count devices(LPC) but the device name can vary between <code>LPCB</code>, <code>LBC</code> or <code>LBC0</code>:</p>
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<p><img src="../images/Universal/awac-md/lpc.png" alt=""></p>
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<h2 id="ini-edge-cases"><a name="ini-edge-cases" class="plugin-anchor" href="#ini-edge-cases"><i class="fa fa-link" aria-hidden="true"></i></a>_INI Edge Cases</h2>
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<p>Mainly seen on X299 refresh boards, there's already a <code>Scope (_SB) { Method (_INI...</code> in your DSDT. This means our SSDT-AWAC will conflict with the one found in our DSDT. For these situations, you'll want to remove <code>Method (_INI, 0, NotSerialized) {}</code> from the SSDT. You'll be left this this in the end:</p>
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<pre><code>DefinitionBlock ("", "SSDT", 2, "DRTNIA", "AWAC", 0x00000000)
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{
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External (STAS, IntObj)
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Scope (_SB)
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{
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If (_OSI ("Darwin"))
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{
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STAS = One
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}
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}
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}
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</code></pre><p>You can find a prebuilt of this here: <a href="https://github.com/dortania/Getting-Started-With-ACPI/blob/master/extra-files/SSDT-AWAC.aml" target="_blank">SSDT-AWAC.aml</a></p>
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<h2 id="now-youre-ready-to-compile-the-ssdt"><a name="now-youre-ready-to-compile-the-ssdt" class="plugin-anchor" href="#now-youre-ready-to-compile-the-ssdt"><i class="fa fa-link" aria-hidden="true"></i></a><a href="../Manual/compile.html">Now you're ready to compile the SSDT!</a></h2>
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