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| author | Christian Poessinger <christian@poessinger.com> | 2020-06-08 22:45:04 +0200 |
|---|---|---|
| committer | Christian Poessinger <christian@poessinger.com> | 2020-06-09 21:00:39 +0200 |
| commit | bafa91b945ac77e2e1d000e356ca819bd5f87460 (patch) | |
| tree | d87af7b732f1ae61ddf3299b9af7f5c319b57d3c /tests | |
| parent | 7b565f0bcc0dcfc7aa95cdbbb63264f5ba41456e (diff) | |
| download | vyos-1x-bafa91b945ac77e2e1d000e356ca819bd5f87460.tar.gz vyos-1x-bafa91b945ac77e2e1d000e356ca819bd5f87460.zip | |
console: T2529: migrate from ttyUSB device to new device in /dev/serial/by-bus
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.
Diffstat (limited to 'tests')
0 files changed, 0 insertions, 0 deletions