From a3d94332a2b5128697373d3093c1cfa56649ec61 Mon Sep 17 00:00:00 2001 From: Daan De Meyer Date: Mon, 10 Jun 2024 12:59:58 +0200 Subject: [PATCH] rules: Limit the number of device units generated for serial ttys As per the suggestion in https://github.com/systemd/systemd/issues/33242. This reduces the number of /dev/ttySXX device units generated in mkosi from 32 to 4. (cherry picked from commit dc38f9addd04c34d1fd743efc407bdebb3573d05) --- rules.d/99-systemd.rules.in | 2 ++ 1 file changed, 2 insertions(+) diff --git a/rules.d/99-systemd.rules.in b/rules.d/99-systemd.rules.in index ad0c7e2fb5..8ba6f177f8 100644 --- a/rules.d/99-systemd.rules.in +++ b/rules.d/99-systemd.rules.in @@ -10,6 +10,8 @@ ACTION=="remove", GOTO="systemd_end" SUBSYSTEM=="tty", KERNEL=="tty[a-zA-Z]*|hvc*|xvc*|hvsi*|ttysclp*|sclp_line*|3270/tty[0-9]*", TAG+="systemd" +# Exclude 8250 serial ports with a zero IO port, as they are not usable until "setserial /dev/ttySxxx port …" is invoked. +SUBSYSTEM=="tty", KERNEL=="ttyS*", DRIVERS=="serial8250", ATTR{port}=="0x0", ENV{SYSTEMD_READY}="0" KERNEL=="vport*", TAG+="systemd" SUBSYSTEM=="ptp", TAG+="systemd"