Enable PCIe Controller C4 on Xavier

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
3

  1. Yes. C4 can be enabled in root port mode but the devkit doesn’t have any PCIe slot that C4 controller can own. If you have a different carrier board which has a slot for C4 controller, by all means you can enable C4 and use that slot

  2. Just enable the C4 controller in the DT. The following patch can help you do that.

    diff --git a/common/tegra194-p2888-0000-a00.dtsi b/common/tegra194-p2888-0000-a00.dtsi
    index 2c5f7eb…4c01d89 100644
    — a/common/tegra194-p2888-0000-a00.dtsi
    +++ b/common/tegra194-p2888-0000-a00.dtsi
    @@ -133,6 +133,22 @@
    phy-names = “pcie-p2u-0”;
    };

    • pcie@14160000 {
    • status = “okay”;
    • vddio-pex-ctl-supply = <&p2888_spmic_sd3>;
    • nvidia,disable-aspm-states = <0xf>;
    • nvidia,enable-power-down;
    • nvidia,disable-clock-request;
    • nvidia,max-speed = <4>;
    • phys = <&p2u_8>,
    • <&p2u_9>;
    • phy-names = “pcie-p2u-0”, “pcie-p2u-1”;
    • };

    pcie@141a0000 {
    status = “disabled”;

1 Like