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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Introduction</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/" aria-current="page" class="sidebar-link">Getting Started With ACPI</a></li><li><a href="/Getting-Started-With-ACPI/ssdt-platform.html" class="sidebar-link">Choosing the SSDTs</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Methods</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/ssdt-methods/ssdt-methods.html" class="sidebar-link">How to create SSDTs</a></li><li><section class="sidebar-group is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/ssdt-methods/ssdt-prebuilt.html" class="sidebar-link">Pre-Built SSDTs</a></li><li><a href="/Getting-Started-With-ACPI/ssdt-methods/ssdt-easy.html" class="sidebar-link">SSDTs: The easy way</a></li><li><a href="/Getting-Started-With-ACPI/ssdt-methods/ssdt-long.html" class="sidebar-link">SSDTs: The long way</a></li></ul></section></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Manual</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/Manual/dump.html" class="sidebar-link">Getting a copy of your DSDT</a></li><li><a href="/Getting-Started-With-ACPI/Manual/compile.html" class="sidebar-link">Compiling and decompiling ACPI Tables</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Desktop</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/Desktops/desktop-disable.html" class="sidebar-link">Disabling desktop dGPUs</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Laptop</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/Laptops/backlight.html" class="sidebar-link">Fixing Backlight</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/Getting-Started-With-ACPI/Laptops/trackpad.html" class="sidebar-link">Fixing Trackpad</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/Getting-Started-With-ACPI/Laptops/laptop-disable.html" class="sidebar-link">Disabling laptop dGPUs</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>Universal</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/Universal/ec-fix.html" class="sidebar-link">Embedded Controller</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/Getting-Started-With-ACPI/Universal/plug.html" class="sidebar-link">CPU Power Management</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/Getting-Started-With-ACPI/Universal/awac.html" class="sidebar-link">AWAC vs RTC</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading open"><span>Methods</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/Universal/awac-methods/prebuilt.html" class="sidebar-link">Prebuilt</a></li><li><a href="/Getting-Started-With-ACPI/Universal/awac-methods/ssdttime.html" class="sidebar-link">SSDTTime</a></li><li><a href="/Getting-Started-With-ACPI/Universal/awac-methods/manual.html" class="sidebar-link">Manual</a></li><li><a href="/Getting-Started-With-ACPI/Universal/awac-methods/manual-hedt.html" aria-current="page" class="active sidebar-link">Manual-HEDT</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/Getting-Started-With-ACPI/Universal/awac-methods/manual-hedt.html#seeing-if-you-need-ssdt-rtc0-range" class="sidebar-link">Seeing if you need SSDT-RTC0-RANGE</a></li><li class="sidebar-sub-header"><a href="/Getting-Started-With-ACPI/Universal/awac-methods/manual-hedt.html#finding-the-acpi-path" class="sidebar-link">Finding the ACPI path</a></li><li class="sidebar-sub-header"><a href="/Getting-Started-With-ACPI/Universal/awac-methods/manual-hedt.html#edits-to-the-sample-ssdt" class="sidebar-link">Edits to the sample SSDT</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/Getting-Started-With-ACPI/Universal/awac-methods/manual-hedt.html#compiling-the-ssdt" class="sidebar-link">Compiling the SSDT</a></li></ul></li><li class="sidebar-sub-header"><a href="/Getting-Started-With-ACPI/Universal/awac-methods/manual-hedt.html#wrapping-up" class="sidebar-link">Wrapping up</a></li></ul></li></ul></section></li><li><a href="/Getting-Started-With-ACPI/Universal/nvram.html" class="sidebar-link">NVRAM PMC</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/Getting-Started-With-ACPI/Universal/rhub.html" class="sidebar-link">USB RHUB</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/Getting-Started-With-ACPI/Universal/imei.html" class="sidebar-link">IMEI</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/Getting-Started-With-ACPI/Universal/unc0.html" class="sidebar-link">Fixing Uncore Bridge</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/Getting-Started-With-ACPI/Universal/smbus.html" class="sidebar-link">Fixing SMBus Support</a></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Methods</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/Getting-Started-With-ACPI/Universal/irq.html" class="sidebar-link">IRQ Fix</a></li><li><a href="/Getting-Started-With-ACPI/Universal/spoof.html" class="sidebar-link">GPU Spoof</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Cleanup</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/cleanup.html" class="sidebar-link">Cleanup</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Misc</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/Getting-Started-With-ACPI/troubleshooting.html" class="sidebar-link">Troubleshooting</a></li><li><a href="/Getting-Started-With-ACPI/CONTRIBUTING.html" class="sidebar-link">Contributing</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-succinct-content content__default"><h1 id="fixing-system-clocks-on-hedt-manual"><a href="#fixing-system-clocks-on-hedt-manual" class="header-anchor">#</a> Fixing System Clocks on HEDT: Manual</h1> <ul><li><a href="#finding-the-acpi-path">Finding the ACPI path</a></li> <li><a href="#edits-to-the-sample-ssdt">Edits to the sample SSDT</a></li> <li><a href="#compiling-the-ssdt">Compiling the SSDT</a></li> <li><a href="#wrapping-up">Wrapping up</a></li></ul> <h2 id="seeing-if-you-need-ssdt-rtc0-range"><a href="#seeing-if-you-need-ssdt-rtc0-range" class="header-anchor">#</a> Seeing if you need SSDT-RTC0-RANGE</h2> <p>To start, first open your decompiled DSDT you got from <a href="/Getting-Started-With-ACPI/Manual/dump.html">Dumping the DSDT</a> and <a href="/Getting-Started-With-ACPI/Manual/compile.html">Decompiling and Compiling</a> with either maciASL(if in macOS) or any other text editor if in Windows or Linux(VSCode has an <a href="https://marketplace.visualstudio.com/items?itemName=Thog.vscode-asl" target="_blank" rel="noopener noreferrer">ACPI extension<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> that can also help).</p> <p>Now search for <code>PNP0B00</code> and look at the <code>_CRS</code> entry within it:</p> <p><img src="/Getting-Started-With-ACPI/assets/img/rtc-range-check.d964e9c9.png" alt=""></p> <p>And from the above example, we see we have 2 banks of RTC memory:</p> <ul><li>Bank 1: starts at 0x70 and is length 0x2</li> <li>Bank 2: starts at 0x74 and is length 0x4</li></ul> <p>Now the problem is that the OEM forgot to mat sections 0x72 and 0x73. Because of this, macOS may halt while booting(prominently in Big Sur)</p> <p>And finally, verify if it has an _STA method as well. This will be used shortly</p> <h2 id="finding-the-acpi-path"><a href="#finding-the-acpi-path" class="header-anchor">#</a> Finding the ACPI path</h2> <p>Finding the ACPI pathing is quite easy actually, first open your decompiled DSDT you got from <a href="/Getting-Started-With-ACPI/Manual/dump.html">Dumping the DSDT</a> and <a href="/Getting-Started-With-ACPI/Manual/compile.html">Decompiling and Compiling</a> with either maciASL(if in macOS) or any other text editor if in Windows or Linux(VSCode has an <a href="https://marketplace.visualstudio.com/items?itemName=Thog.vscode-asl" target="_blank" rel="noopener noreferrer">ACPI extension<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> that can also help).</p> <p>To start, search for the following:</p> <ul><li>Finding the RTC name:
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<ul><li>Search <code>PNP0B00</code></li></ul></li> <li>Finding the LowPinCount path:
|
||
<ul><li>Search <code>Name (_ADR, 0x001F0000)</code></li></ul></li> <li>Finding the PCI path:
|
||
<ul><li>Search <code>PNP0A08</code> (If multiple show up, use the first one)</li></ul></li></ul> <p>You should get something like the following show up:</p> <table><thead><tr><th style="text-align:center;">RTC Pathing</th> <th style="text-align:center;">LPC Pathing</th> <th style="text-align:center;">PCI Pathing</th></tr></thead> <tbody><tr><td style="text-align:center;"><img src="/Getting-Started-With-ACPI/assets/img/rtc-name.afa4c3f4.png" alt=""></td> <td style="text-align:center;"><img src="/Getting-Started-With-ACPI/assets/img/lpc.bfa9cf23.png" alt=""></td> <td style="text-align:center;"><img src="/Getting-Started-With-ACPI/assets/img/pci0.4477f361.png" alt=""></td></tr></tbody></table> <p>From the above, we can see we have <code>RTC</code>, <code>LPC0</code> and <code>PCI0</code>. Now we can head to the next stage</p> <h2 id="edits-to-the-sample-ssdt"><a href="#edits-to-the-sample-ssdt" class="header-anchor">#</a> Edits to the sample SSDT</h2> <p>Now that we have our ACPI path, lets grab our SSDT and get to work:</p> <ul><li><a href="https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-RTC0-RANGE.dsl" target="_blank" rel="noopener noreferrer">SSDT-RTC0-RANGE.dsl<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li></ul> <p>By default, this uses <code>PC00.LPC0.RTC</code> for the pathing. you'll want to rename accordingly.</p> <p>Following the example from above, we'll be renaming it to <code>PCI0.LPC0.RTC</code>:</p> <p><strong>Before</strong>:</p> <div class="language- extra-class"><pre class="language-text"><code>External (_SB_.PC00.LPC0, DeviceObj) <- Rename this
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External (_SB_.PC00.LPC0.RTC_, DeviceObj) <- Rename this
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Scope (_SB.PC00.LPC0) <- Rename this
|
||
</code></pre></div><p><img src="/Getting-Started-With-ACPI/assets/img/ssdt-before-rename-hedt.4b47d5a3.png" alt=""></p> <p>Following the example pathing we found, the SSDT should look something like this:</p> <p><strong>After</strong>:</p> <div class="language- extra-class"><pre class="language-text"><code>External (_SB_.PCI0.LPC0, DeviceObj) <- Renamed
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Scope (_SB.PCI0.LPC0.RTC) <- Renamed
|
||
|
||
Scope (_SB.PCI0.LPC0) <- Renamed
|
||
|
||
|
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/* <- Remove if your RTC device didn't have an _STA
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Scope (RTC)
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{
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Method (_STA, 0, NotSerialized) // _STA: Status
|
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{
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If (_OSI ("Darwin"))
|
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{
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Return (Zero)
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}
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Else
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{
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Return (0x0F)
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}
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}
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||
}
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||
*/ <- Remove if your RTC device didn't have an _STA
|
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</code></pre></div><p><img src="/Getting-Started-With-ACPI/assets/img/ssdt-after-rename-hedt.ea1fe10e.png" alt=""></p> <h3 id="compiling-the-ssdt"><a href="#compiling-the-ssdt" class="header-anchor">#</a> Compiling the SSDT</h3> <p>With the SSDT done, you're now <a href="/Getting-Started-With-ACPI/Manual/compile.html">ready to compile the SSDT!</a></p> <h2 id="wrapping-up"><a href="#wrapping-up" class="header-anchor">#</a> Wrapping up</h2> <p>Once you're done making your SSDT, either head to the next page to finish the rest of the SSDTs or head here if you're ready to wrap up:</p> <ul><li><a href="/Getting-Started-With-ACPI/cleanup.html"><strong>Cleanup</strong></a></li></ul></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">10/16/2020, 9:07:15 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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