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Getting Started With ACPI
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AWAC vs RTC
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NVRAM PMC
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Cleanup
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<!-- Title -->
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<h1>
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<a href=".." >AWAC vs RTC</a>
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<h1 id="fixing-system-clocks">Fixing System Clocks</h1>
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<p><strong>For Intel 300 series chipsets only</strong></p>
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<p>So on newer Intel 300 series motherboards, manufactueres 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 varaible 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">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 nothing shows then no need to continue and no need for this SSDT as you have now AWAC. Otherwise, continue on!</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 next search for <code>STAS ==</code>:</li>
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</ul>
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<p><img src="https://i.imgur.com/uuUF857.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.</p>
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<p>For systems where no <code>STAS</code> 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 thwe 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="https://cdn.discordapp.com/attachments/456913818467958789/675169950108876852/Screen_Shot_2020-02-06_at_7.43.24_PM.png" alt=""></p>
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