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-rw-r--r--rules.d/99-systemd.rules.in2
1 files changed, 2 insertions, 0 deletions
diff --git a/rules.d/99-systemd.rules.in b/rules.d/99-systemd.rules.in
index ad0c7e2..8ba6f17 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"