v4.19.13 snapshot.
diff --git a/arch/arm/include/debug/netx.S b/arch/arm/include/debug/netx.S
new file mode 100644
index 0000000..81e1b2a
--- /dev/null
+++ b/arch/arm/include/debug/netx.S
@@ -0,0 +1,36 @@
+/*
+ * Debugging macro include header
+ *
+ * Copyright (C) 1994-1999 Russell King
+ * Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+*/
+
+#define UART_DATA 0
+#define UART_FLAG 0x18
+#define UART_FLAG_BUSY (1 << 3)
+
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =CONFIG_DEBUG_UART_PHYS
+ ldr \rv, =CONFIG_DEBUG_UART_VIRT
+ .endm
+
+ .macro senduart,rd,rx
+ str \rd, [\rx, #UART_DATA]
+ .endm
+
+ .macro busyuart,rd,rx
+1002: ldr \rd, [\rx, #UART_FLAG]
+ tst \rd, #UART_FLAG_BUSY
+ bne 1002b
+ .endm
+
+ .macro waituart,rd,rx
+1001: ldr \rd, [\rx, #UART_FLAG]
+ tst \rd, #UART_FLAG_BUSY
+ bne 1001b
+ .endm