--- zzzz-none-000/linux-4.1.52/drivers/of/fdt.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/drivers/of/fdt.c	2022-03-02 11:37:13.000000000 +0000
@@ -938,9 +938,15 @@
 	early_init_dt_check_for_initrd(node);
 
 	/* Retrieve command line */
-	p = of_get_flat_dt_prop(node, "bootargs", &l);
+	p = of_get_flat_dt_prop(node, "bootargs-prepend", &l);
 	if (p != NULL && l > 0)
 		strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
+	p = of_get_flat_dt_prop(node, "bootargs", &l);
+	if (p != NULL && l > 0)
+		strlcat(data, p, min_t(int, strlen(data) + (int)l, COMMAND_LINE_SIZE));
+	p = of_get_flat_dt_prop(node, "bootargs-append", &l);
+	if (p != NULL && l > 0)
+		strlcat(data, p, min_t(int, strlen(data) + (int)l, COMMAND_LINE_SIZE));
 
 	/*
 	 * CONFIG_CMDLINE is meant to be a default in case nothing else