My embedded board has 2 UARTs. I want to have console output on both the UARTs.
In kernel/Documentation/console/console.txt it’s mentioned that:
you can only define one console per device type (serial, video).
Does this mean I can use only one UART as console? Or, is it possible to redirect the console output to both of these UARTs?
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Answer
It’s possible to achieve that via adding consoles to the kernel command line.
For example,console=ttyS0,115200n8 console=ttyS1,57600n8 will add two serial consoles (8250 driver assumed) on ports 0 and 1 (whatever it means on the platform in question). One of them will be so called preferred.
For the details, consult kernel documentation: http://elixir.free-electrons.com/linux/latest/source/Documentation/admin-guide/serial-console.rst