how to disable smmu for pcie on R28.2

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX1
1

hi,
how to disable smmu on R28.2,i follow https://devtalk.nvidia.com/default/topic/984348/jetson-tx1/stability-issue-with-dma-memory-transfer-while-gpu-activity/post/5046533/#5046533, i didn’t fiand iommu on dts.

2

i didn’t fiand iommu on dts
It has to be there if you are using R28.2. Can you please grep the folder where all dts files are present?