TX2 J21 config pinmux as gpio in jetpack4.2

hello wm18822827507,

you may using WindowsOS to generate dtsi files from the pinmux spreadsheet, copy those dtsi files to your UbuntuOS.
there’s python script, pinmux-dts2cfg.py to convert them as board configuration files. then you should perform full flash to update the board configurations.
for example,

you may also check some similar discussion threads, such as Topic 53026, or Topic 59977 for reference.

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