--- zzzz-none-000/linux-4.1.52/drivers/tty/serial/8250/8250_core.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/drivers/tty/serial/8250/8250_core.c	2022-03-02 11:37:13.000000000 +0000
@@ -17,6 +17,9 @@
  */
 
 #if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#if defined(CONFIG_BCM_KF_CHAR_SYSRQ)
+static char sysrq_start_char='^';
+#endif
 #define SUPPORT_SYSRQ
 #endif
 
@@ -1524,6 +1527,20 @@
 			else if (lsr & UART_LSR_FE)
 				flag = TTY_FRAME;
 		}
+#if defined(CONFIG_BCM_KF_CHAR_SYSRQ) && defined(SUPPORT_SYSRQ)
+		/*
+		* Simple hack for substituting a regular ASCII char as the break
+		* char for the start of the Magic Sysrq sequence.  This duplicates
+		* some of the code in uart_handle_break() in serial_core.h
+		*/
+		if (up->port.sysrq == 0)
+		{
+			if (ch == sysrq_start_char) {
+				up->port.sysrq = jiffies + HZ*5;
+				goto ignore_char;
+			}
+		}
+#endif
 		if (uart_handle_sysrq_char(port, ch))
 			goto ignore_char;
 
@@ -1832,6 +1849,9 @@
 	struct irq_info *i;
 	struct hlist_node *n;
 	struct hlist_head *h;
+#if defined(CONFIG_BCM_KF_KERN_WARNING)
+	i = NULL;
+#endif
 
 	mutex_lock(&hash_mutex);