<p>Nick Vaccaro has uploaded this change for <strong>review</strong>.</p><p><a href="https://review.coreboot.org/27156">View Change</a></p><pre style="font-family: monospace,monospace; white-space: pre-wrap;">nocturne: disable p-states<br><br>Add "intel_pstate=no_hwp" to the kernel command line to instruct<br>kernel to disable p-states as a temporary workaround for an SoC<br>hang.<br><br>BUG=b:79666828<br>BRANCH=none<br>TEST="emerge-nocturne depthcharge coreboot chromeos-bootimage",<br>flash spi image onto nocturne, boot to kernel and verify device<br>stays alive and responsive for several minutes without locking up.<br><br>Change-Id: I71ed4c80c109b28ffa85d48338ce3a62396d272e<br>Signed-off-by: Nick Vaccaro <nvaccaro@google.com><br>---<br>M src/mainboard/google/poppy/variants/nocturne/devicetree.cb<br>1 file changed, 2 insertions(+), 1 deletion(-)<br><br></pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;">git pull ssh://review.coreboot.org:29418/coreboot refs/changes/56/27156/1</pre><pre style="font-family: monospace,monospace; white-space: pre-wrap;"><span>diff --git a/src/mainboard/google/poppy/variants/nocturne/devicetree.cb b/src/mainboard/google/poppy/variants/nocturne/devicetree.cb</span><br><span>index f746c08..0b30caa 100644</span><br><span>--- a/src/mainboard/google/poppy/variants/nocturne/devicetree.cb</span><br><span>+++ b/src/mainboard/google/poppy/variants/nocturne/devicetree.cb</span><br><span>@@ -60,7 +60,8 @@</span><br><span>    register "PmTimerDisabled" = "1"</span><br><span>         register "VmxEnable" = "1"</span><br><span> </span><br><span style="color: hsl(0, 100%, 40%);">-      register "speed_shift_enable" = "1"</span><br><span style="color: hsl(120, 100%, 40%);">+       # Disable P-States</span><br><span style="color: hsl(120, 100%, 40%);">+    register "speed_shift_enable" = "0"</span><br><span>      register "dptf_enable" = "1"</span><br><span>     register "tdp_pl2_override" = "15"</span><br><span>       register "psys_pmax" = "45"</span><br><span></span><br></pre><p>To view, visit <a href="https://review.coreboot.org/27156">change 27156</a>. To unsubscribe, or for help writing mail filters, visit <a href="https://review.coreboot.org/settings">settings</a>.</p><div itemscope itemtype="http://schema.org/EmailMessage"><div itemscope itemprop="action" itemtype="http://schema.org/ViewAction"><link itemprop="url" href="https://review.coreboot.org/27156"/><meta itemprop="name" content="View Change"/></div></div>

<div style="display:none"> Gerrit-Project: coreboot </div>
<div style="display:none"> Gerrit-Branch: master </div>
<div style="display:none"> Gerrit-MessageType: newchange </div>
<div style="display:none"> Gerrit-Change-Id: I71ed4c80c109b28ffa85d48338ce3a62396d272e </div>
<div style="display:none"> Gerrit-Change-Number: 27156 </div>
<div style="display:none"> Gerrit-PatchSet: 1 </div>
<div style="display:none"> Gerrit-Owner: Nick Vaccaro <nvaccaro@google.com> </div>