Hi
I'm using PL2303 based USB serial adapter for the kernel and getty
serial console. I noticed getty console stopped working in v4.18 and
bisected this into commit 7041d9c3f01b ("USB: serial: pl2303: add
support for tx xon/xoff flow control").
Serial console works up to somewhere after when getty service starts. I
can sometimes see on the serial console that getty was started but not
always. After that there is no messages printed from the kernel or
userspace.
[ OK ] Started Getty on tty1.
[ OK ] Started Serial Getty on ttyUSB0.
[ OK ] Reached target Login Prompts.
[ OK ] Started Login Service.
My userspace is up-to-date Debian/testing using systemd.
Things work if I revert 7041d9c3f01b. Revert works both on top of v4.18
or on today's head f2ce1065e767 ("Merge
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net").
I have "console=ttyUSB0,115200n8" in my command-line parameter and
following serial-getty@ttyUSB0.service status:
# systemctl status serial-getty@ttyUSB0.service
� serial-getty@ttyUSB0.service - Serial Getty on ttyUSB0
Loaded: loaded (/lib/systemd/system/serial-getty@.service; enabled;
vendor preset: enabled)
Active: active (running) since Tue 2018-11-20 11:26:03 EET; 15s ago
Docs: man:agetty(8)
man:systemd-getty-generator(8)
http://0pointer.de/blog/projects/serial-console.html
Main PID: 383 (agetty)
CGroup:
/system.slice/system-serial\x2dgetty.slice/serial-getty@ttyUSB0.service
383 /sbin/agetty -o -p -- \u --keep-baud 115200,38400,9600
ttyUSB0 vt220
Nov 20 11:26:03 debian-i386-t systemd[1]: Started Serial Getty on ttyUSB0.
--
Jarkko
