How to disable iommu in Jetson Orin devkit?

Hi Guys,

I got a Jetson Orin devkit, and I pluged a NIC on the PCIe slot intended for an DPDK use case.

Now I find myself not able to set “iommu.passthrough=1” to disable iommu in extlinux.conf which works in my ARM server. If I do so, the Orin devkit will not work after rebooting, with the fan stopped and no GUI output.

I also tried to flash it, with selecting “smmu default passthrough” or deselect “smmu support” in “make menuconfig”, same result.

So I wander if there is a way to disable iommu?

Thanks alot!