New top-level directory: system

This directory groups the following elements:
 * the default root filesystem skeleton
 * the default device tables
 * the Config.in options for system configuration (UART port for
   getty, system hostname, etc.)
 * the make rules to apply the system configuration options

Even though the skeleton and device tables could have lived in fs/, it
would have been strange to have the UART, system hostname and other
related options into fs/. A new system/ directory makes more sense.

As a consequence, this patch also removes target/Makefile.in, which
has become useless in the process.

[Peter: fixup TARGET_SKELETON settings / documentation to match]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Yann E. MORIN <yann.morin.1998@free.fr>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

Config.in

@@ -419,7 +419,7 @@ endmenu
 
 source "toolchain/Config.in"
 
-source "target/generic/Config.in"
+source "system/Config.in"
 
 source "package/Config.in"
 

Makefile

@@ -259,7 +259,7 @@ STAMP_DIR:=$(BASE_DIR)/stamps
 BINARIES_DIR:=$(BASE_DIR)/images
 TARGET_DIR:=$(BASE_DIR)/target
 TOOLCHAIN_DIR=$(BASE_DIR)/toolchain
-TARGET_SKELETON=$(TOPDIR)/fs/skeleton
+TARGET_SKELETON=$(TOPDIR)/system/skeleton
 
 LEGAL_INFO_DIR=$(BASE_DIR)/legal-info
 REDIST_SOURCES_DIR=$(LEGAL_INFO_DIR)/sources
@@ -310,7 +310,6 @@ endif
 include package/*/*.mk
 
 include boot/common.mk
-include target/Makefile.in
 include linux/linux.mk
 
 TARGETS+=target-finalize
@@ -325,6 +324,7 @@ TARGETS+=target-generatelocales
 endif
 endif
 
+include system/system.mk
 include fs/common.mk
 
 TARGETS_CLEAN:=$(patsubst %,%-clean,$(TARGETS))

docs/manual/customize-rootfs.txt

@@ -11,8 +11,8 @@ There are a few ways to customize the resulting target filesystem:
   rebuild your toolchain and tools, these changes will be lost.
 
 * Create your own 'target skeleton'. You can start with the default
-  skeleton available under +fs/skeleton+ and then customize it to suit
-  your needs. The +BR2_ROOTFS_SKELETON_CUSTOM+ and
+  skeleton available under +system/skeleton+ and then customize it to
+  suit your needs. The +BR2_ROOTFS_SKELETON_CUSTOM+ and
   +BR2_ROOTFS_SKELETON_CUSTOM_PATH+ will allow you to specify the
   location of your custom skeleton. At build time, the contents of the
   skeleton are copied to output/target before any package

system/Config.in

@@ -111,7 +111,7 @@ endchoice
 if BR2_ROOTFS_SKELETON_CUSTOM
 config BR2_ROOTFS_SKELETON_CUSTOM_PATH
 	string "custom target skeleton path"
-	default "fs/skeleton"
+	default "system/skeleton"
 	help
 	  Path custom target skeleton.
 endif

target/Makefile.in

@@ -1,3 +0,0 @@
-# make sure to put everything that is board-specific before the tarroot targets
-include target/generic/Makefile.in
-