How to disable SMMU in Jetpack 4.2

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Jetpack 4.2 file tegra186-soc-base.dtsi is much different than earlier Jetpack versions. I have tried numerous modifications, but have been unable to disable the SMMU for my PCIE. Can anyone help?

2

Hi,

Delete following properties under pcie-controller@10003000 node.

            iommus = <&smmu TEGRA_SID_AFI>;
            iommu_sodev_map;

#if LINUX_VERSION >= 414
iommu-map = <0x0 &smmu TEGRA_SID_AFI 0x1000>;
iommu-map-mask = <0x0>;
#endif

Manikanta

3

May I know how to generate the dtb and flash into Tx2?

4

Instructions to generate DTB,
https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%2520Linux%2520Driver%2520Package%2520Development%2520Guide%2Fkernel_custom.html%23

Instructions to flash kernel and DTB;
Use “-k kernel” and “-k kernel-dtb” to flash kernel image and DTB respectively.

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%2520Linux%2520Driver%2520Package%2520Development%2520Guide%2Fflashing.html%23wwpID0E0LB0HA

Manikanta