--- zzzz-none-000/linux-4.1.52/arch/mips/include/asm/mach-generic/spaces.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/arch/mips/include/asm/mach-generic/spaces.h	2022-03-02 11:37:12.000000000 +0000
@@ -94,11 +94,15 @@
 #endif
 
 #ifndef FIXADDR_TOP
+#if defined(CONFIG_BCM_KF_FIXADDR_TOP)
+#define FIXADDR_TOP     ((unsigned long)(long)(int)0xff000000)
+#else
 #ifdef CONFIG_KVM_GUEST
 #define FIXADDR_TOP		((unsigned long)(long)(int)0x7ffe0000)
 #else
 #define FIXADDR_TOP		((unsigned long)(long)(int)0xfffe0000)
 #endif
 #endif
+#endif
 
 #endif /* __ASM_MACH_GENERIC_SPACES_H */