Index: linux-4.1.52/Makefile
===================================================================
--- linux-4.1.52.orig/Makefile	2018-01-17 11:46:03.510867639 +0800
+++ linux-4.1.52/Makefile	2018-01-17 11:46:03.990867639 +0800
@@ -15,7 +15,7 @@
 # o Look for make include files relative to root of kernel src
 MAKEFLAGS += -rR --include-dir=$(CURDIR)
 
-BRCMDRIVERS_DIR_RELATIVE = ../../bcmdrivers
+BRCMDRIVERS_DIR_RELATIVE = $(BCM_BUILD_DIR)/bcmdrivers
 # Avoid funny character set dependencies
 unexport LC_ALL
 LC_COLLATE=C
@@ -299,6 +299,14 @@
 
 HOSTCC       = gcc
 HOSTCXX      = g++
+
+# ENV variable 'BCM_BUILD_DIR' will pass from OpenWRT build system
+# Needs some ENV variables/Compilation flags which defined in BRCM SDK
+ifndef BCM_BUILD_DIR
+$(error "You should define 'BCM_BUILD_DIR'")
+endif
+include $(BCM_BUILD_DIR)/make.common
+
 ifdef BCM_KF # defined(CONFIG_BCM_KF_MISC_MAKEFILE)
 BCM_FATAL_CC_WARNING_FLAGS := -Werror -Wfatal-errors -Wno-date-time -Wno-declaration-after-statement -Wno-switch-bool
 
Index: linux-4.1.52/init/main.c
===================================================================
--- linux-4.1.52.orig/init/main.c	2018-01-17 11:46:03.430867639 +0800
+++ linux-4.1.52/init/main.c	2018-01-17 11:46:03.990867639 +0800
@@ -959,7 +959,8 @@
 		panic("Requested init %s failed (error %d).",
 		      execute_command, ret);
 	}
-	if (!try_to_run_init_process("/sbin/init") ||
+	if (!try_to_run_init_process("/etc/preinit") ||
+	    !try_to_run_init_process("/sbin/init") ||
 	    !try_to_run_init_process("/etc/init") ||
 	    !try_to_run_init_process("/bin/init") ||
 	    !try_to_run_init_process("/bin/sh"))
Index: linux-4.1.52/net/core/Makefile
===================================================================
--- linux-4.1.52.orig/net/core/Makefile	2018-01-17 11:46:03.530867639 +0800
+++ linux-4.1.52/net/core/Makefile	2018-01-17 20:37:44.632545937 +0800
@@ -5,6 +5,7 @@
 ifdef BCM_KF # defined(CONFIG_BCM_KF_BLOG)
 EXTRA_CFLAGS	+= -I$(INC_BRCMDRIVER_PUB_PATH)/$(BRCM_BOARD)
 EXTRA_CFLAGS	+= -I$(INC_BRCMSHARED_PUB_PATH)/bcm963xx
+EXTRA_CFLAGS	+= -I$(BCM_BUILD_DIR)
 endif # BCM_KF
 
 obj-y := sock.o request_sock.o skbuff.o datagram.o stream.o scm.o \
Index: linux-4.1.52/net/core/blog.c
===================================================================
--- linux-4.1.52.orig/net/core/blog.c	2018-01-17 11:46:03.526867639 +0800
+++ linux-4.1.52/net/core/blog.c	2018-01-17 20:37:51.747447940 +0800
@@ -74,7 +74,7 @@
 #include <net/dsfield.h>
 #include <linux/netfilter/xt_dscp.h>
 #if defined(CONFIG_BCM_KF_MAP) || defined(CONFIG_BCM_MAP_MODULE)
-#include "../../../bcmdrivers/opensource/char/map/impl1/ivi_map.h"
+#include "bcmdrivers/opensource/char/map/impl1/ivi_map.h"
 #endif
 #include <blog_ioctl.h>