--- zzzz-none-000/linux-4.9.231/arch/mips/include/asm/processor.h	2020-07-22 07:10:54.000000000 +0000
+++ falcon-5590-729/linux-4.9.231/arch/mips/include/asm/processor.h	2022-03-30 12:03:33.000000000 +0000
@@ -22,6 +22,10 @@
 #include <asm/mipsregs.h>
 #include <asm/prefetch.h>
 
+#ifdef CONFIG_SOC_GRX500
+#define ARCH_LOW_ADDRESS_LIMIT MAX_DMA_ADDRESS
+#endif
+
 /*
  * Return current * instruction pointer ("program counter").
  */