Enable More than 4 Serial Ports Linux/Unix

The easy way to fix this is (as root) to edit /etc/default/grub and append ” 8250.nr_uarts=8″ (without quotes) to the end of the line “GRUB_CMDLINE_LINUX_DEFAULT=”

You can set any number up to 32 as the number of serial ports this way.

You then have to run “update-grub” as root. After rebooting you should have the serial ports working.


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