--- zzzz-none-000/linux-4.19.183/drivers/tty/serial/serial_core.c	2021-03-24 10:07:39.000000000 +0000
+++ bcm63-7530ax-756/linux-4.19.183/drivers/tty/serial/serial_core.c	2023-06-28 08:54:20.000000000 +0000
@@ -570,6 +570,37 @@
 	uart_start(tty);
 }
 
+#if defined(CONFIG_AVM_ENHANCED)
+/*----------------------------------------------------------------------------*\
+ * keine Ausgaben auf der Console
+ * avm_console_enabled=1 schaltet die Ausgaben auf der Console ueber n_tty_write
+ * wieder frei beim Kunden beachtet niemand die Ausgaben auf der Console
+\*----------------------------------------------------------------------------*/
+unsigned int avm_console_enabled;
+EXPORT_SYMBOL(avm_console_enabled);
+
+static int uart_avm_console_enabled(struct tty_struct *tty)
+{
+	struct uart_state *state = tty->driver_data;
+	struct uart_port *port = state->uart_port;
+
+	if (port->cons) {
+		if (port->cons->flags & (CON_ENABLED | CON_CONSDEV)) {
+			return avm_console_enabled;
+		}
+	}
+	return 1;
+}
+
+static int setup_debug_console(char *p)
+{
+	avm_console_enabled = 1;
+	return 0;
+}
+
+__setup("debug_console", setup_debug_console);
+#endif
+
 static int uart_write(struct tty_struct *tty,
 					const unsigned char *buf, int count)
 {
@@ -2450,6 +2481,9 @@
 	.poll_get_char	= uart_poll_get_char,
 	.poll_put_char	= uart_poll_put_char,
 #endif
+#if defined(CONFIG_AVM_ENHANCED)
+	.avm_console_enabled = uart_avm_console_enabled,
+#endif
 };
 
 static const struct tty_port_operations uart_port_ops = {