How to add Kernel Parameter in the dtsi

I wanted to add kernel parameter inside /proc/cmdline
I am using Tegra186_Linux_R32.4.3_aarch64 …
I am not able to find dtsi file location where to add for cmdline parameter
I wanted to add isolcpusparameter

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You can put it to /boot/extlinux/extlinux.conf directly.

The APPEND line in the file mentioned by @WayneWWW is a space-delimited kernel argument. It is true that part of this is inherited as environment set up from device tree (note APPEND starts with “${cbootargs}”), but for customization, just add it to extlinux.conf. You’ll complicate your life if you do this from the device tree.

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