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During testing it was discovered that there is a well known problem (we had for
ethernet interfaces) also in the serial port world. They will be enumerated and
mapped to /dev/ttyUSBxxx differently from boot to boot. This is especially
painful on my development APU4 board which also has a Sierra Wireless MC7710
LTE module installed.
The serial port will toggle between ttyUSB2 and ttyUSB5 depending on the
amount of serial port extenders attached (FT4232H).
The shipped udev rule (/usr/lib/udev/rules.d/60-serial.rules) partly solves
this by enumerating the devices into /dev/serial/by-id folder with their name
and serial number - it's a very good idea but I've found that not all of the
FT4232H dongles have a serial number programmed - this leads to the situation
that when you plug in two cables with both having serial number 0 - only one
device symlink will appear - the previous one is always overwritten by the
latter one.
Derive /usr/lib/udev/rules.d/60-serial.rules and create a /dev/serial/by-bus
directory and group devices by attached USB root port.
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Support for Hayes modems has been long gone (1.2.x) and nobody cared. It was
removed in commit d582bbaf3 ("update console settings for systemd") of
vyatta-cfg-system.
So as there have been zero complaints - cleanup the CLI.
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The current implementation only works once the system has been fully booted
up and the config nodes have been process. So there is no "early" kernel
debugging. It is started with priority 400 (after all network stuff) - thus it
has a questionable at all for Kernel debugging.
It would only make sense if the entire system is changed to supply the config
stuff to the Kernel commandline and then send it to a dedicated MAC address
target as network will be initialized late.
As there are zero Phabricator tasks available and we do not know any user using
this - the "feature" will be removed.
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