pi@cm4:~ $ lspci
pi@cm4:~ $
pi@cm4:~ $ dmesg -T | grep pci
[Tue Mar 22 10:27:19 2022] brcm-pcie fd500000.pcie: host bridge /scb/pcie@7d500000 ranges:
[Tue Mar 22 10:27:19 2022] brcm-pcie fd500000.pcie: No bus range found for /scb/pcie@7d500000, using [bus 00-ff]
[Tue Mar 22 10:27:19 2022] brcm-pcie fd500000.pcie: MEM 0x0600000000..0x063fffffff -> 0x00c0000000
[Tue Mar 22 10:27:19 2022] brcm-pcie fd500000.pcie: IB MEM 0x0000000000..0x00bfffffff -> 0x0000000000
[Tue Mar 22 10:27:19 2022] brcm-pcie fd500000.pcie: link down
sudo cp /boot/bcm2711-rpi-cm4.dtb /boot/bcm2711-rpi-cm4.dtb.bak
dtc -I dtb -O dts /boot/bcm2711-rpi-cm4.dtb -o ~/test.dts
nano ~/test.dts
&pcie0 {
brcm,enable-l1ss;
max-link-speed = <1>;
dtc -I dts -O dtb ~/test.dts -o ~/test.dtb
sudo mv ~/test.dtb /boot/bcm2711-rpi-cm4.dtb
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