Index: sys/dev/uart/uart_cpu_fdt.c
===================================================================
--- sys/dev/uart/uart_cpu_fdt.c
+++ sys/dev/uart/uart_cpu_fdt.c
@@ -122,6 +122,7 @@
 {
 	const char *propnames[] = {"stdout-path", "linux,stdout-path", "stdout",
 	    "stdin-path", "stdin", NULL};
+	const char *propname_dbg[] = "{"freebsd,debug-path", NULL};
 	const char **name;
 	struct uart_class *class;
 	phandle_t node, chosen;
@@ -135,8 +136,16 @@
 	if (!err)
 		return (0);
 
-	if (devtype != UART_DEV_CONSOLE)
+	switch (devtype) {
+	case UART_DEV_CONSOLE:
+		cp = kern_getenv("hw.fdt.console");
+		break;
+	case UART_DEV_DBGPORT:
+		cp = kern_getenv("hw.fdt.debug");
+		break;
+	default:
 		return (ENXIO);
+	}
 
 	/* Has the user forced a specific device node? */
 	cp = kern_getenv("hw.fdt.console");
@@ -146,7 +155,11 @@
 		 */
 		node = -1;
 		if ((chosen = OF_finddevice("/chosen")) != -1) {
-			for (name = propnames; *name != NULL; name++) {
+			if (devtype == UART_DEV_DBGPORT)
+				name = propnames_dbg;
+			else
+				name = propnames;
+			for (; *name != NULL; name++) {
 				if (phandle_chosen_propdev(chosen, *name,
 				    &node) == 0)
 					break;