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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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SYSTEMD-TTY-ASK-PASSWORD-AGENT(1)			  systemd-tty-ask-password-agent			 SYSTEMD-TTY-ASK-PASSWORD-AGENT(1)

NAME
systemd-tty-ask-password-agent - List or process pending systemd password requests SYNOPSIS
systemd-tty-ask-password-agent [OPTIONS...] [VARIABLE=VALUE...] DESCRIPTION
systemd-tty-ask-password-agent is a password agent that handles password requests of the system, for example for hard disk encryption passwords or SSL certificate passwords that need to be queried at boot-time or during runtime. systemd-tty-ask-password-agent implements the Password Agents Specification[1], and is one of many possible response agents which answer to queries formulated with systemd-ask-password(1). OPTIONS
The following options are understood: --list Lists all currently pending system password requests. --query Process all currently pending system password requests by querying the user on the calling TTY. --watch Continuously process password requests. --wall Forward password requests to wall(1) instead of querying the user on the calling TTY. --plymouth Ask question with plymouth(8) instead of querying the user on the calling TTY. --console Ask question on /dev/console instead of querying the user on the calling TTY. -h, --help Print a short help text and exit. --version Print a short version string and exit. EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise. SEE ALSO
systemd(1), systemctl(1), systemd-ask-password-console.service(8), wall(1), plymouth(8) NOTES
1. Password Agents Specification https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents systemd 237 SYSTEMD-TTY-ASK-PASSWORD-AGENT(1)
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