Use new SHELL variable BUILDROOT_KERNEL_CONFIG_METHOD

which will override selection between xconfig and menuconfig

make xconfig will, if it fails, or user does not save configuration
result in make menuconfig beeing tried

Fix several issues causing final part of linux to be regenerated
on each make.

target/linux/Config.in.advanced

@@ -406,7 +406,7 @@ config BR2_PACKAGE_LINUX_KCONFIG
 
 choice
 	prompt "Preferred config tool"
-	default BR2_MAKE_MENUCONFIG
+	default BR2_MAKE_XCONFIG
 	depends on BR2_PACKAGE_LINUX_USE_XCONFIG
 	help
 	  Define the preferred tool to invoke if a configuration is invalid

target/linux/Makefile.in.advanced

@@ -109,12 +109,17 @@ endif
 endif
 endif
 
+# Override config method with shell variable
+ifneq ($(BUILDROOT_KERNEL_CONFIG_METHOD),)
+KERNEL_CONFIG_METHOD:=$(strip $(subst ",,$(BUILDROOT_KERNEL_CONFIG_METHOD)))
+#"))
+else
 KERNEL_CONFIG_METHOD:=$(strip $(subst ",,$(BR2_KERNEL_CONFIG_METHOD)))
 #"))
 ifeq ($(KERNEL_CONFIG_METHOD),)
-KERNEL_CONFIG_METHOD:=menuconfig
+KERNEL_CONFIG_METHOD:=xconfig
+endif
 endif
-
 # -----------------------------------------------------------------------------
 ifndef LINUX26_FORMAT
 ifneq ($(strip $(subst ",,$(BR2_PACKAGE_LINUX_FORMAT))),)
@@ -145,7 +150,7 @@ endif
 # UIMAGE
 ifeq ($(LINUX26_FORMAT),uImage)
 LINUX26_MKIMAGE_DIR:=$(PROJECT_BUILD_DIR)/u-boot-tools
-LINUX26_MKIMAGE_DEP:=linux26-mkimage
+LINUX26_MKIMAGE_DEP:=$(LINUX26_MKIMAGE_DIR)/mkimage
 ifeq ($(LINUX26_BINLOC),)
 LINUX26_BINLOC:=arch/$(KERNEL_ARCH)/boot/$(LINUX26_FORMAT)
 endif
@@ -170,10 +175,11 @@ endif
 KERNEL_EXT:=.bz
 endif
 
-
+ROOTFS_STRIPPED_SUFFIX=$(strip $(subst ",,$(ROOTFS_SUFFIX)))
+#"))
 # -----------------------------------------------------------------------------
 # File name for the Linux kernel binary
-LINUX26_KERNEL_NAME:=$(BOARD_NAME)-linux-$(LINUX26_VERSION)$(ROOTFS_SUFFIX)$(KERNEL_EXT)
+LINUX26_KERNEL_NAME:=$(BOARD_NAME)-linux-$(LINUX26_VERSION)$(ROOTFS_STRIPPED_SUFFIX)$(KERNEL_EXT)
 
 
 ifeq ($(BOARD_NAME),)
@@ -226,7 +232,7 @@ endif
 
 
 # -----------------------------------------------------------------------------
-LINUX26_TARGETS+=$(LINUX26_KERNEL) linux26-version
+LINUX26_TARGETS+=$(LINUX26_KERNEL) $(PROJECT_BUILD_DIR)/.linux-version
 
 ifeq ($(BR2_LINUX_COPYTO_ROOTFS),y)
 LINUX26_TARGETS+=$(TARGET_DIR)/boot/$(LINUX26_KERNEL_NAME)
@@ -316,7 +322,12 @@ ifeq ($(BR2_PACKAGE_LINUX_USE_DEFCONFIG),y)
 	$(MAKE) $(LINUX26_MAKE_FLAGS) -C $(LINUX26_DIR) $(BOARD_NAME)_defconfig
 endif
 ifeq ($(BR2_PACKAGE_LINUX_USE_XCONFIG),y)
-	$(MAKE) $(LINUX26_MAKE_FLAGS) -C $(LINUX26_DIR) $(KERNEL_CONFIG_METHOD)
+ifeq ($(KERNEL_CONFIG_METHOD),xconfig)
+	$(MAKE) $(LINUX26_MAKE_FLAGS) -C $(LINUX26_DIR) xconfig || \
+		$(MAKE) $(LINUX26_MAKE_FLAGS) -C $(LINUX26_DIR) menuconfig \
+else
+	$(MAKE) $(LINUX26_MAKE_FLAGS) -C $(LINUX26_DIR) menuconfig
+endif
 endif
 ifeq ($(BR2_PACKAGE_LINUX_USE_KCONFIG),y)
 	# Try user defined config
@@ -397,10 +408,11 @@ $(LINUX26_DIR)/$(LINUX26_BINLOC): $(INITRAMFS_TARGET) $(BB_INITRAMFS_TARGET) \
 		$(LINUX26_DIR)/.depend_done
 	$(MAKE) $(LINUX26_MAKE_FLAGS) \
 		-C $(LINUX26_DIR) $(LINUX26_FORMAT)
+	touch $@
 
 $(LINUX26_KERNEL): $(LINUX26_DIR)/$(LINUX26_BINLOC)
 	cp -pf $(LINUX26_DIR)/$(LINUX26_BINLOC) $(LINUX26_KERNEL)
-	touch -c $@
+	touch $@
 
 # -----------------------------------------------------------------------------
 $(PROJECT_BUILD_DIR)/autotools-stamps/linux_modules_target_installed: $(LINUX26_DIR)/.depend_done
@@ -453,19 +465,21 @@ $(TARGET_DIR)/boot/busybox.config: $(BUSYBOX_DIR)/.config
 
 /tftpboot/$(LINUX26_KERNEL_NAME): $(LINUX26_KERNEL)
 	-mkdir -p /tftpboot
-	-cp -dpf $(LINUX26_KERNEL) /tftpboot/$(LINUX26_KERNEL_NAME)
+	-cp -dpf $(LINUX26_KERNEL) $@
+	touch $@
 
 ifneq ($(LINUX_COPYTO),/tftpboot)
 $(LINUX_COPYTO)/$(LINUX26_KERNEL_NAME): $(LINUX26_KERNEL)
 	mkdir -p $(LINUX_COPYTO)
-	cp -dpf $(LINUX26_KERNEL) $(LINUX_COPYTO)/$(LINUX26_KERNEL_NAME)
+	cp -dpf $(LINUX26_KERNEL) $@
+	touch $@
 endif
 
-$(PROJECT_BUILD_DIR)/.linux-version:
+$(PROJECT_BUILD_DIR)/.linux-version: $(LINUX26_KERNEL)
 	echo $(LINUX26_VERSION_PROBED) > $(PROJECT_BUILD_DIR)/.linux-version
-	echo LINUX_MODULES=$(LINUX26_VERSION_PROBED)	
+	echo LINUX_MODULES=`$(LINUX26_VERSION_PROBED)`
 
-linux26-mkimage:	u-boot
+$(LINUX26_MKIMAGE_DIR)/mkimage:	$(MKIMAGE)
 	mkdir -p $(LINUX26_MKIMAGE_DIR)
 	cp $(MKIMAGE) $(LINUX26_MKIMAGE_DIR)