--- zzzz-none-000/linux-4.9.276/arch/mips/kernel/prom.c	2021-07-20 14:21:16.000000000 +0000
+++ falcon-5530-750/linux-4.9.276/arch/mips/kernel/prom.c	2023-04-05 08:19:00.000000000 +0000
@@ -49,6 +49,13 @@
 	return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
 }
 
+int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
+					     phys_addr_t size, bool nomap)
+{
+	add_memory_region(base, size, BOOT_MEM_RESERVED);
+	return 0;
+}
+
 void __init __dt_setup_arch(void *bph)
 {
 	if (!early_init_dt_scan(bph))