Pcie on Ulis Notes https://wolf-u.li/en/tag/pcie/ Recent content in Pcie on Ulis Notes Hugo en Copyright 2006-CURRENTYEAR Uli Wolf - All rights reserved Sun, 17 Sep 2023 22:18:36 +1700 Raspberry PI CM4 Disable PCIe after brcm-pcie link down message https://wolf-u.li/raspberry-pi-cm4-disable-pcie/ Sun, 17 Sep 2023 22:18:36 +1700 https://wolf-u.li/raspberry-pi-cm4-disable-pcie/ <p>On my BIGTREETECH E3EZ i switched from the CB1 to the Raspberry PI CM4. Unfortunately on every boot the following message appeared:</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-plaintext" data-lang="plaintext"><span class="line"><span class="cl">brcm-pcie fd500000.pcie: link down </span></span></code></pre></td></tr></table> </div> </div><p>The issue is the missing PCIe Port, hence you have to disable the feature to get rid of this message. <ins class="adsbygoogle" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-2322978122735420" data-ad-slot="3161252284"></ins> Create the file <code>disable-pcie-overlay.dts</code> with the following command:</p> <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">wget https://gist.githubusercontent.com/SirUli/de94ddb751b91adfa6809f286a18a382/raw/af010907360153f74edc8f65d415d717378bf037/gistfile1.txt -O /tmp/disable-pcie-overlay.dts </span></span></code></pre></td></tr></table> </div> </div><p>You must then convert the file using the following command:</p> On my BIGTREETECH E3EZ i switched from the CB1 to the Raspberry PI CM4. Unfortunately on every boot the following message appeared:

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brcm-pcie fd500000.pcie: link down

The issue is the missing PCIe Port, hence you have to disable the feature to get rid of this message. Create the file disable-pcie-overlay.dts with the following command:

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wget https://gist.githubusercontent.com/SirUli/de94ddb751b91adfa6809f286a18a382/raw/af010907360153f74edc8f65d415d717378bf037/gistfile1.txt -O /tmp/disable-pcie-overlay.dts

You must then convert the file using the following command:

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sudo dtc -@ -I dts -O dtb -o /boot/overlays/disable-pcie-overlay.dtbo /tmp/disable-pcie-overlay.dts

Then delete the file with the following command:

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rm /tmp/disable-pcie-overlay.dts

Finally open the boot config file using the following command:

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sudo nano /boot/config.txt

And add the following line at the top:

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dtoverlay=disable-pcie-overlay

Then save using CTRL+X which will ask you to save. Enter Y and ENTER to save. On the next reboot that message from above will be gone.

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