kbuild: move include directives of board configuration files

This commit changes the location of include directives
of board configuration files.

The purpose of this change is:
 - Slim down $(TOPDIR)/config.mk
 - Prevent $(TOPDIR)/Makefile from including the same
    configuration file twice
 - Do not include include/config.mk multiple times
    because ARCH, CPU, BOARD, VENDOR, SOC are exported

Before this commit:

 - include/autoconf.mk was included from $(TOPDIR)/Makefile
   and $(TOPDIR)/config.mk
   (This means $(TOPDIR)/Makefile included include/autoconf.mk twice)

 - include/{spl,tpl}-autoconf.mk was included from $(TOPDIR)/config.mk

 - include/config.mk was included from $(TOPDIR)/Makefile
   and $(TOPDIR)/config.mk
   (This means $(TOPDIR)/Makefile included include/config.mk twice)

After this commit:

 - include/autoconf.mk is included from $(TOPDIR)/Makefile
   and $(TOPDIR)/scripts/Makefile.build

 - include/{spl,tpl}-autoconf.mk is included from $(TOPDIR)/spl/Makefile
   and $(TOPDIR)/scripts/Makefile.build

 - include/config.mk is included from $(TOPDIR)/config.mk and
   $(TOPDIR)/spl/Makefile

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

config.mk

@@ -13,21 +13,6 @@ PLATFORM_LDFLAGS =
 
 #########################################################################
 
-# Load generated board configuration
-ifeq ($(CONFIG_TPL_BUILD),y)
-# Include TPL autoconf
-sinclude include/tpl-autoconf.mk
-else
-ifeq ($(CONFIG_SPL_BUILD),y)
-# Include SPL autoconf
-sinclude include/spl-autoconf.mk
-else
-# Include normal autoconf
-sinclude include/autoconf.mk
-endif
-endif
-sinclude $(OBJTREE)/include/config.mk
-
 # Some architecture config.mk files need to know what CPUDIR is set to,
 # so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
 # Check if arch/$ARCH/cpu/$CPU exists, otherwise assume arch/$ARCH/cpu contains

scripts/Makefile.build

@@ -42,6 +42,17 @@ subdir-ccflags-y :=
 # Read auto.conf if it exists, otherwise ignore
 -include include/config/auto.conf
 
+# Added for U-Boot: Load U-Boot configuration
+ifeq ($(CONFIG_TPL_BUILD),y)
+  -include include/tpl-autoconf.mk
+else
+  ifeq ($(CONFIG_SPL_BUILD),y)
+    -include include/spl-autoconf.mk
+  else
+    -include include/autoconf.mk
+  endif
+endif
+
 include scripts/Kbuild.include
 
 # Added for U-Boot

spl/Makefile

@@ -40,6 +40,14 @@ else
 SPL_BIN := u-boot-spl
 endif
 
+include include/config.mk
+
+ifeq ($(CONFIG_TPL_BUILD),y)
+  -include include/tpl-autoconf.mk
+else
+  -include include/spl-autoconf.mk
+endif
+
 include $(TOPDIR)/config.mk
 
 HAVE_VENDOR_COMMON_LIB = $(if $(wildcard $(SRCTREE)/board/$(VENDOR)/common/Makefile),y,n)