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Linux/AM5718: Changing the debug UART

Part Number: AM5718

Tool/software: Linux

hello team,

The customer had a am5718 board using uart1(the uart3 not lead out),he want to enter the filesystem. But the default uart of filesystem in the sdk is uart3 and he want to know how to modify the filesystem to make the uart1  output debugging information.

I have suggested him refer to the post e2e.ti.com/.../2317574

His reply is he cann't enter the uart3 so he unable to enter the command, so please help provide the complete process.