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Full Discussion: TTY Insane
Top Forums UNIX for Dummies Questions & Answers TTY Insane Post 302351439 by edfair on Tuesday 8th of September 2009 02:21:06 PM
Old 09-08-2009
Still open whether I'm correct or not. Serial is funny sometimes.
I would suspect that your issue was from one of the computers to the blackbox. Just supposin, since blackbox stuff has always been rock solid when I've dealt with them.
But you also have issues with timings. If clocks drift a little off things go bad. There usually is enough play at the end of the character to handle it. Combine some drift with some rc degredation and the line receivers may not be flipped in time for the UART to read correctly in the middle of the bit time.
I've got a permanent scar on my forehead from beating against those issues. Well, psychologically at least.
 

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LEARN ABOUT CENTOS

systemd-getty-generator

SYSTEMD-GETTY-GENERATOR(8)				      systemd-getty-generator					SYSTEMD-GETTY-GENERATOR(8)

NAME

       systemd-getty-generator - Generator for enabling getty instances on the console

SYNOPSIS

       /usr/lib/systemd/system-generators/systemd-getty-generator

DESCRIPTION

       systemd-getty-generator is a generator that automatically instantiates serial-getty@.service on the kernel console /dev/console if that is
       not directed to the virtual console subsystem. It will also instantiate serial-getty@.service instances for virtualizer consoles, if
       execution in a virtualized environment is detected. This should ensure that the user is shown a login prompt at the right place, regardless
       of which environment the system is started in. For example, it is sufficient to redirect the kernel console with a kernel command line
       argument such as console= to get both kernel messages and a getty prompt on a serial TTY. See kernel-parameters.txt[1] for more information
       on the console= kernel parameter.

       systemd-getty-generator implements the generator specification[2].

       Further information about configuration of gettys you may find in systemd for Administrators, Part XVI: Gettys on Serial Consoles (and
       Elsewhere)[3].

SEE ALSO

       systemd(1), agetty(8)

NOTES

	1. kernel-parameters.txt
	   https://www.kernel.org/doc/Documentation/kernel-parameters.txt

	2. generator specification
	   http://www.freedesktop.org/wiki/Software/systemd/Generators

	3. systemd for Administrators, Part XVI: Gettys on Serial Consoles (and Elsewhere)
	   http://0pointer.de/blog/projects/serial-console.html

systemd 208														SYSTEMD-GETTY-GENERATOR(8)
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