Setting iommu.passthrough=1 seems to disable RJ45 ethernet connection on Jetson AGX Orin

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Orin
1

I am trying to disable IOMMU on the Jetson AGX Orin running R36.4 image.
I did that by setting the kernel args in the UEFI BIOS to iommu.passthrough=1 by interrupting normal boot and then once the device is up and running; checking that is was applied by running cat /proc/cmdline

But then I noticed that my remote connection other ethernet to the device went down and I could only access it over serial debug connection.

Any idea why this may be happening? Removing the additional kernel arg restores the device to the previous good state. Trying to bring up the ethernet connection on eno1 fails.

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The dmesg may tell more about what is wrong.

But if your purpose is to disable SMMU, I would suggest you disable them by using the device tree but not such kernel cmdline way.

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