--- zzzz-none-000/linux-4.1.52/arch/mips/include/asm/pgtable-32.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/arch/mips/include/asm/pgtable-32.h	2022-03-02 11:37:12.000000000 +0000
@@ -61,7 +61,11 @@
 
 #define VMALLOC_START	  MAP_BASE
 
+#if defined(CONFIG_BCM_KF_512MB_DDR) && defined(CONFIG_BCM_512MB_DDR)
+#define PKMAP_BASE		(0xfc000000UL)
+#else
 #define PKMAP_BASE		(0xfe000000UL)
+#endif
 
 #ifdef CONFIG_HIGHMEM
 # define VMALLOC_END	(PKMAP_BASE-2*PAGE_SIZE)