duagon MC50M - Page 42

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Getting Started

20MC50M00 E5



2020-10-20

2.6.6.2 Configuring Console Redirection and Early-Console Functionality

The following describes configuration in Ubuntu.

Note: Replace ttyFx by the actual port designation in all examples.

Console Redirection

» Create a getty service for your console:

» Enable the RS232 serial port to be used:

» Re-boot the system.

» When the operating system is loading and the Linux kernel is started, set kernel

parameter console to "console=ttyFx".

Early-Console Functionality

The ASIX driver does not support early-console functionality yet. You can use a

workaround, though.

» While the system is running determine the I/O port of the ttyFx devices:

This yields, e.g., 0xb090.

» Create a getty service for your console:

» Enable the RS232 serial port to be used:

» Re-boot the system.

» When the operating system is loading and the Linux kernel is started, set kernel

parameter console to "console=uart,io,0xb090,115200n8", with the I/O port number

determined before.

$ nano /lib/systemd/system/serial-getty@.service

Change the following line

ExecStart=-/sbin/agetty --keep-baud 115200,38400,9600 %I $TERM

to this setting:

ExecStart=-/sbin/agetty 115200 %I $TERM

$ systemctl enable serial-getty@ttyFx.service

Created symlink from /etc/systemd/system/getty.target.wants/serial-

getty@ttyFx.service to /lib/systemd/system/serial-getty@.service

$ dmesg | grep ttyFx

Alternatively via

$ sudo cat /proc/ioports