- generalize the menuconfig linux kernel support

- simplify toplevel mkdir rules a tiny bit

Makefile

@@ -88,14 +88,8 @@ dirs: $(DL_DIR) $(BUILD_DIR) $(STAGING_DIR)
 # dependencies anywhere else
 #
 #############################################################
-$(DL_DIR):
+$(DL_DIR) $(BUILD_DIR) $(TOOL_BUILD_DIR):
-	@mkdir -p $(DL_DIR)
+	@mkdir -p $@
-
-$(BUILD_DIR):
-	@mkdir -p $(BUILD_DIR)
-
-$(TOOL_BUILD_DIR):
-	@mkdir -p $(TOOL_BUILD_DIR)
 
 $(STAGING_DIR):
 	@mkdir -p $(STAGING_DIR)/lib

target/device/Config.in

@@ -1,5 +1,20 @@
 menu "Board Support Options"
 
+config BR2_TARGET_GENERIC
+	bool "linux kernel"
+	default n
+	select BR2_PACKAGE_LINUX
+	help
+	  Architecture or board dependant linux kernel.
+
+config BR2_PACKAGE_LINUX
+	bool "linux"
+	default n
+	depends BR2_TARGET_GENERIC
+	help
+	  The Linux kernel.
+	  http://www.kernel.org/
+
 source "target/device/AMD/Config.in"
 source "target/device/Atmel/Config.in"
 source "target/device/Hitachi/Config.in"

target/device/x86/Config.in

@@ -1,22 +1,6 @@
 comment "Generic x86 Device Support"
 	depends BR2_i386
 
-config BR2_TARGET_X86_GENERIC
-	bool "Generic x86 support"
-	depends BR2_i386
-	default n
-	select BR2_PACKAGE_LINUX
-	help
-	  Generic x86 support.
-
 comment "Package support"
 	depends BR2_TARGET_AMD_ALCHEMY
 
-config BR2_PACKAGE_LINUX
-	bool "linux"
-	default n
-	depends BR2_TARGET_X86_GENERIC
-	help
-	  The Linux kernel.
-	  http://www.kernel.org/
-

target/device/x86/Makefile.in

@@ -1,3 +1,3 @@
-ifeq ($(strip $(BR2_TARGET_X86_GENERIC)),y)
+ifeq ($(strip $(BR2_TARGET_GENERIC)),y)
 include target/device/x86/i386/Makefile.in
 endif