We are currently using kernel - Linux tegra-ubuntu 4.9.253-tegra
May I know why you want to diable iommu?
For what kind of purpose or requirement?
I remember smmu is already disabled on jetson nano by default.
Check if below properties are still there or not.
- /delete-property/ iommus; - /delete-property/ iommu-map; - /delete-property/ iommu-map-mask;
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