diff --git a/src/southbridge/amd/pi/hudson/lpc.c b/src/southbridge/amd/pi/hudson/lpc.c
index 1dacfd0..38c5733 100644
--- a/src/southbridge/amd/pi/hudson/lpc.c
+++ b/src/southbridge/amd/pi/hudson/lpc.c
@@ -83,6 +83,13 @@
 
 	/* Initialize i8254 timers */
 	setup_i8254 ();
+
+	/* Setup SERIRQ, enable continuous mode */
+	byte = (BIT(4) | BIT(7));
+	if (!IS_ENABLED(CONFIG_SERIRQ_CONTINUOUS_MODE))
+		byte |= BIT(6);
+
+	pm_write8(PM_SERIRQ_CONF, byte);
 }
 
 static void hudson_lpc_read_resources(device_t dev)