Create CPUDIR variable

The CPUDIR variable points to the location of a target's CPU directory.
Currently, it is set to cpu/$CPU.  However, using $CPUDIR will allow for
more flexibility in the future.  It lays the groundwork for reorganizing
U-Boot's directory structure to support a layout such as:

  arch/$ARCH/cpu/$CPU/* (architecture with multiple CPU types)
  arch/$ARCH/cpu/*      (architecture with one CPU type)
Signed-off-by: NPeter Tyser <ptyser@xes-inc.com>

Makefile

@@ -169,16 +169,16 @@ include $(TOPDIR)/config.mk
 #########################################################################
 # U-Boot objects....order is important (i.e. start must be first)
 
-OBJS  = cpu/$(CPU)/start.o
+OBJS  = $(CPUDIR)/start.o
 ifeq ($(CPU),i386)
-OBJS += cpu/$(CPU)/start16.o
-OBJS += cpu/$(CPU)/resetvec.o
+OBJS += $(CPUDIR)/start16.o
+OBJS += $(CPUDIR)/resetvec.o
 endif
 ifeq ($(CPU),ppc4xx)
-OBJS += cpu/$(CPU)/resetvec.o
+OBJS += $(CPUDIR)/resetvec.o
 endif
 ifeq ($(CPU),mpc85xx)
-OBJS += cpu/$(CPU)/resetvec.o
+OBJS += $(CPUDIR)/resetvec.o
 endif
 
 OBJS := $(addprefix $(obj),$(OBJS))
@@ -188,9 +188,9 @@ LIBS += lib_generic/lzma/liblzma.a
 LIBS += lib_generic/lzo/liblzo.a
 LIBS += $(shell if [ -f board/$(VENDOR)/common/Makefile ]; then echo \
 	"board/$(VENDOR)/common/lib$(VENDOR).a"; fi)
-LIBS += cpu/$(CPU)/lib$(CPU).a
+LIBS += $(CPUDIR)/lib$(CPU).a
 ifdef SOC
-LIBS += cpu/$(CPU)/$(SOC)/lib$(SOC).a
+LIBS += $(CPUDIR)/$(SOC)/lib$(SOC).a
 endif
 ifeq ($(CPU),ixp)
 LIBS += cpu/ixp/npe/libnpe.a
@@ -354,7 +354,7 @@ ifeq ($(CONFIG_KALLSYMS),y)
 endif
 
 $(OBJS):	depend
-		$(MAKE) -C cpu/$(CPU) $(if $(REMOTE_BUILD),$@,$(notdir $@))
+		$(MAKE) -C $(CPUDIR) $(if $(REMOTE_BUILD),$@,$(notdir $@))
 
 $(LIBS):	depend $(SUBDIRS)
 		$(MAKE) -C $(dir $(subst $(obj),,$@))
@@ -404,7 +404,7 @@ env:
 # Explicitly make _depend in subdirs containing multiple targets to prevent
 # parallel sub-makes creating .depend files simultaneously.
 depend dep:	$(TIMESTAMP_FILE) $(VERSION_FILE) $(obj)include/autoconf.mk
-		for dir in $(SUBDIRS) cpu/$(CPU) $(dir $(LDSCRIPT)) ; do \
+		for dir in $(SUBDIRS) $(CPUDIR) $(dir $(LDSCRIPT)) ; do \
 			$(MAKE) -C $$dir _depend ; done
 
 TAG_SUBDIRS = $(SUBDIRS)

board/freescale/mpc8536ds/config.mk

@@ -26,7 +26,7 @@
 ifndef NAND_SPL
 ifeq ($(CONFIG_MK_NAND), y)
 TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
-LDSCRIPT := $(TOPDIR)/cpu/$(CPU)/u-boot-nand.lds
+LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-nand.lds
 endif
 endif
 

board/freescale/mpc8569mds/config.mk

@@ -26,7 +26,7 @@
 ifndef NAND_SPL
 ifeq ($(CONFIG_MK_NAND), y)
 TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
-LDSCRIPT := $(TOPDIR)/cpu/$(CPU)/u-boot-nand.lds
+LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-nand.lds
 endif
 endif
 

board/freescale/mx51evk/config.mk

@@ -20,6 +20,6 @@
 # MA 02111-1307 USA
 #
 
-LDSCRIPT = cpu/$(CPU)/$(SOC)/u-boot.lds
+LDSCRIPT = $(CPUDIR)/$(SOC)/u-boot.lds
 TEXT_BASE = 0x97800000
 IMX_CONFIG = $(SRCTREE)/board/$(BOARDDIR)/imximage.cfg

board/freescale/p1_p2_rdb/config.mk

@@ -27,7 +27,7 @@
 ifndef NAND_SPL
 ifeq ($(CONFIG_MK_NAND), y)
 TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
-LDSCRIPT := $(TOPDIR)/cpu/$(CPU)/u-boot-nand.lds
+LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-nand.lds
 endif
 endif
 

config.mk

@@ -110,14 +110,15 @@ RANLIB	= $(CROSS_COMPILE)RANLIB
 # Load generated board configuration
 sinclude $(OBJTREE)/include/autoconf.mk
 
-ifdef	ARCH
+# Some architecture config.mk files need to know what CPUDIR is set to,
+# so calculate CPUDIR before including ARCH/SOC/CPU config.mk files.
+CPUDIR=cpu/$(CPU)
+
 sinclude $(TOPDIR)/lib_$(ARCH)/config.mk	# include architecture dependend rules
-endif
-ifdef	CPU
-sinclude $(TOPDIR)/cpu/$(CPU)/config.mk		# include  CPU	specific rules
-endif
+sinclude $(TOPDIR)/$(CPUDIR)/config.mk		# include  CPU	specific rules
+
 ifdef	SOC
-sinclude $(TOPDIR)/cpu/$(CPU)/$(SOC)/config.mk	# include  SoC	specific rules
+sinclude $(TOPDIR)/$(CPUDIR)/$(SOC)/config.mk	# include  SoC	specific rules
 endif
 ifdef	VENDOR
 BOARDDIR = $(VENDOR)/$(BOARD)

doc/README.ARM-SoC

@@ -7,14 +7,14 @@ I introduced the concept of Soc (system on a chip) into the ./cpu
 directory. That means that code that is cpu (i.e. core) specific
 resides in
 
-	cpu/$(CPU)/
+	$(CPUDIR)/
 
 and code that is specific to some SoC (i.e. vendor specific
 peripherals around the core) is moved into
 
-	cpu/$(CPU)/$(SOC)/
+	$(CPUDIR)/$(SOC)/
 
-Thus a library/archive "cpu/$(CPU)/$(SOC)/lib$(SOC).a" will be build
+Thus a library/archive "$(CPUDIR)/$(SOC)/lib$(SOC).a" will be build
 and linked. Examples will be
 
 	cpu/arm920t/imx/

lib_arm/config.mk

@@ -63,4 +63,4 @@ ifeq (,$(findstring lib_arm/eabi_compat.o,$(PLATFORM_LIBS)))
 PLATFORM_LIBS += $(OBJTREE)/lib_arm/eabi_compat.o
 endif
 endif
-LDSCRIPT := $(SRCTREE)/cpu/$(CPU)/u-boot.lds
+LDSCRIPT := $(SRCTREE)/$(CPUDIR)/u-boot.lds

lib_blackfin/config.mk

@@ -56,7 +56,7 @@ LDR_FLAGS-$(CONFIG_BFIN_BOOTROM_USES_EVT1) += -J
 
 LDR_FLAGS += --bmode $(subst BFIN_BOOT_,,$(CONFIG_BFIN_BOOT_MODE))
 LDR_FLAGS += --use-vmas
-LDR_FLAGS += --initcode $(obj)cpu/$(CPU)/initcode.o
+LDR_FLAGS += --initcode $(obj)$(CPUDIR)/initcode.o
 ifneq ($(CONFIG_BFIN_BOOT_MODE),BFIN_BOOT_UART)
 LDR_FLAGS-$(CONFIG_ENV_IS_EMBEDDED_IN_LDR) += \
 	--punchit $$(($(CONFIG_ENV_OFFSET))):$$(($(CONFIG_ENV_SIZE))):$(obj)env-ldr.o

lib_sh/config.mk

@@ -31,4 +31,4 @@ endif
 PLATFORM_CPPFLAGS += -DCONFIG_SH -D__SH__
 PLATFORM_LDFLAGS += -e $(TEXT_BASE) --defsym reloc_dst=$(TEXT_BASE)
 
-LDSCRIPT := $(SRCTREE)/cpu/$(CPU)/u-boot.lds
+LDSCRIPT := $(SRCTREE)/$(CPUDIR)/u-boot.lds

nand_spl/board/freescale/mpc8536ds/Makefile

@@ -29,7 +29,7 @@ PAD_TO := 0xfff01000
 
 include $(TOPDIR)/config.mk
 
-LDSCRIPT= $(TOPDIR)/cpu/$(CPU)/u-boot-nand_spl.lds
+LDSCRIPT= $(TOPDIR)/$(CPUDIR)/u-boot-nand_spl.lds
 LDFLAGS	= -Bstatic -T $(LDSCRIPT) -Ttext $(TEXT_BASE) $(PLATFORM_LDFLAGS)
 AFLAGS	+= -DCONFIG_NAND_SPL
 CFLAGS	+= -DCONFIG_NAND_SPL
@@ -93,7 +93,7 @@ $(obj)ns16550.c:
 
 $(obj)resetvec.S:
 	@rm -f $(obj)resetvec.S
-	ln -s $(SRCTREE)/cpu/$(CPU)/resetvec.S $(obj)resetvec.S
+	ln -s $(SRCTREE)/$(CPUDIR)/resetvec.S $(obj)resetvec.S
 
 $(obj)fixed_ivor.S:
 	@rm -f $(obj)fixed_ivor.S

nand_spl/board/freescale/mpc8569mds/Makefile

@@ -29,7 +29,7 @@ PAD_TO := 0xfff01000
 
 include $(TOPDIR)/config.mk
 
-LDSCRIPT= $(TOPDIR)/cpu/$(CPU)/u-boot-nand_spl.lds
+LDSCRIPT= $(TOPDIR)/$(CPUDIR)/u-boot-nand_spl.lds
 LDFLAGS	= -Bstatic -T $(LDSCRIPT) -Ttext $(TEXT_BASE) $(PLATFORM_LDFLAGS)
 AFLAGS	+= -DCONFIG_NAND_SPL
 CFLAGS	+= -DCONFIG_NAND_SPL
@@ -93,7 +93,7 @@ $(obj)ns16550.c:
 
 $(obj)resetvec.S:
 	@rm -f $(obj)resetvec.S
-	ln -s $(SRCTREE)/cpu/$(CPU)/resetvec.S $(obj)resetvec.S
+	ln -s $(SRCTREE)/$(CPUDIR)/resetvec.S $(obj)resetvec.S
 
 $(obj)fixed_ivor.S:
 	@rm -f $(obj)fixed_ivor.S

nand_spl/board/freescale/p1_p2_rdb/Makefile

@@ -29,7 +29,7 @@ PAD_TO := 0xfff01000
 
 include $(TOPDIR)/config.mk
 
-LDSCRIPT= $(TOPDIR)/cpu/$(CPU)/u-boot-nand_spl.lds
+LDSCRIPT= $(TOPDIR)/$(CPUDIR)/u-boot-nand_spl.lds
 LDFLAGS	= -Bstatic -T $(LDSCRIPT) -Ttext $(TEXT_BASE) $(PLATFORM_LDFLAGS)
 AFLAGS	+= -DCONFIG_NAND_SPL
 CFLAGS	+= -DCONFIG_NAND_SPL
@@ -93,7 +93,7 @@ $(obj)ns16550.c:
 
 $(obj)resetvec.S:
 	@rm -f $(obj)resetvec.S
-	ln -s $(SRCTREE)/cpu/$(CPU)/resetvec.S $(obj)resetvec.S
+	ln -s $(SRCTREE)/$(CPUDIR)/resetvec.S $(obj)resetvec.S
 
 $(obj)fixed_ivor.S:
 	@rm -f $(obj)fixed_ivor.S

onenand_ipl/board/apollon/Makefile

@@ -46,7 +46,7 @@ $(onenandobj)u-boot.lds:	$(LDSCRIPT)
 # from cpu directory
 $(obj)start.S:
 	@rm -f $@
-	ln -s $(SRCTREE)/cpu/$(CPU)/start.S $@
+	ln -s $(SRCTREE)/$(CPUDIR)/start.S $@
 
 # from onenand_ipl directory
 $(obj)onenand_ipl.h: