arch/powerpc/*/config.mk: make CONFIG_SYS_LDSCRIPT settings work

As we try to get rid of board specific config.mk files we must
provide a way for board specific settings of the LDSCRIPT variable
(path to the linker script) where needed.

We now implement the following hierarchy:

- Highest priority has a "#define CONFIG_SYS_LDCONFIG" in the board
  config file.
- If CONFIG_SYS_LDCONFIG is not set, and the system is booting from
  NAND (CONFIG_NAND_SPL is set), then a board specific linker
  script board/$(BOARDDIR)/u-boot-nand.lds gets used.
- If we are not booting from NAND, we test if a processor specific
  linker script arch/powerpc/cpu/$(CPU)/u-boot.lds exists; if so we
  use that.
- As default, arch/powerpc/config.mk gets used.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Kim Phillips <kim.phillips@freescale.com>
Cc: Kumar Gala <kumar.gala@freescale.com>
Cc: Andy Fleming <afleming@gmail.com>
Acked-by: Stefan Roese <sr@denx.de>

arch/powerpc/config.mk

@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000-2002
+# (C) Copyright 2000-2010
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -29,6 +29,17 @@ PLATFORM_RELFLAGS += -mrelocatable
 PLATFORM_CPPFLAGS += -DCONFIG_PPC -D__powerpc__
 PLATFORM_LDFLAGS  += -n
 
+ifdef CONFIG_SYS_LDSCRIPT
+# need to strip off double quotes
+LDSCRIPT := $(subst ",,$(CONFIG_SYS_LDSCRIPT))
+else ifdef CONFIG_NAND_SPL
+LDSCRIPT := $(SRCTREE)/$(CONFIG_BOARDDIR)/u-boot-nand.lds
+else
+ifneq ($(wildcard $(SRCTREE)/arch/powerpc/cpu/$(CPU)/u-boot.lds),)
+LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/$(CPU)/u-boot.lds
+endif
+endif
+
 #
 # When cross-compiling on NetBSD, we have to define __PPC__ or else we
 # will pick up a va_list declaration that is incompatible with the

arch/powerpc/cpu/mpc512x/config.mk

@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2007-2009 DENX Software Engineering
+# (C) Copyright 2007-2010 DENX Software Engineering
 #
 # See file CREDITS for list of people who contributed to this
 # project.
@@ -19,11 +19,8 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 # MA 02111-1307 USA
 #
+
 PLATFORM_RELFLAGS += -fPIC -meabi
 
 PLATFORM_CPPFLAGS += -DCONFIG_MPC512X -DCONFIG_E300 \
 			-ffixed-r2 -msoft-float -mcpu=603e
-
-# Use default linker script.
-# A board port can override this setting in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/mpc512x/u-boot.lds

arch/powerpc/cpu/mpc5xx/config.mk

@@ -21,16 +21,6 @@
 # MA 02111-1307 USA
 #
 
-#
-# File:			config.mk
-#
-# Discription:		compiler flags and make definitions
-#
-
-
 PLATFORM_RELFLAGS +=	-fPIC -meabi
 
 PLATFORM_CPPFLAGS +=	-DCONFIG_5xx -ffixed-r2 -mpowerpc -msoft-float
-
-# Use default linker script.  Board port can override in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/mpc5xx/u-boot.lds

arch/powerpc/cpu/mpc5xxx/config.mk

@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2003
+# (C) Copyright 2003-2010
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -25,6 +25,3 @@ PLATFORM_RELFLAGS += -fPIC -meabi
 
 PLATFORM_CPPFLAGS += -DCONFIG_MPC5xxx -ffixed-r2 \
 		     -mstring -mcpu=603e -mmultiple
-
-# Use default linker script.  Board port can override in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/mpc5xxx/u-boot.lds

arch/powerpc/cpu/mpc8220/config.mk

@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2003
+# (C) Copyright 2003-2010
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -25,6 +25,3 @@ PLATFORM_RELFLAGS += -fPIC -meabi
 
 PLATFORM_CPPFLAGS += -DCONFIG_MPC8220 -ffixed-r2 \
 		     -mstring -mcpu=603e -mmultiple
-
-# Use default linker script.  Board port can override in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/mpc8220/u-boot.lds

arch/powerpc/cpu/mpc824x/config.mk

@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000
+# (C) Copyright 2000-2010
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -24,6 +24,3 @@
 PLATFORM_RELFLAGS += -fPIC -meabi
 
 PLATFORM_CPPFLAGS += -DCONFIG_MPC824X -ffixed-r2 -mstring -mcpu=603e -msoft-float
-
-# Use default linker script.  Board port can override in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/mpc824x/u-boot.lds

arch/powerpc/cpu/mpc8260/config.mk

@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000
+# (C) Copyright 2000-2010
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -25,6 +25,3 @@ PLATFORM_RELFLAGS += -fPIC -meabi
 
 PLATFORM_CPPFLAGS += -DCONFIG_8260 -DCONFIG_CPM2 -ffixed-r2 \
 		     -mstring -mcpu=603e -mmultiple
-
-# Use default linker script.  Board port can override in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/mpc8260/u-boot.lds

arch/powerpc/cpu/mpc83xx/config.mk

@@ -24,6 +24,3 @@ PLATFORM_RELFLAGS += -fPIC -meabi
 
 PLATFORM_CPPFLAGS += -DCONFIG_MPC83xx -DCONFIG_E300 \
 			-ffixed-r2 -msoft-float
-
-# Use default linker script.  Board port can override in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/mpc83xx/u-boot.lds

arch/powerpc/cpu/mpc85xx/config.mk

@@ -34,6 +34,3 @@ PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
 # http://gcc.gnu.org/ml/gcc-patches/2008-04/msg00311.html
 PLATFORM_CPPFLAGS +=$(call cc-option,-mspe=yes)
 PLATFORM_CPPFLAGS +=$(call cc-option,-mno-spe)
-
-# Use default linker script.  Board port can override in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/mpc85xx/u-boot.lds

arch/powerpc/cpu/mpc86xx/config.mk

@@ -25,10 +25,3 @@ PLATFORM_RELFLAGS += -fPIC -meabi
 
 PLATFORM_CPPFLAGS += -ffixed-r2 -mstring
 PLATFORM_CPPFLAGS += -maltivec -mabi=altivec -msoft-float
-
-# Enable gc-sections to enable generation of smaller images.
-PLATFORM_LDFLAGS += --gc-sections
-PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
-
-# Use default linker script.  Board port can override in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/mpc86xx/u-boot.lds

arch/powerpc/cpu/mpc8xx/config.mk

@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000
+# (C) Copyright 2000-2010
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this

arch/powerpc/cpu/ppc4xx/config.mk

@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000
+# (C) Copyright 2000-2010
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -32,6 +32,3 @@ PLATFORM_CPPFLAGS += -Wa,-m440 -mcpu=440
 else
 PLATFORM_CPPFLAGS += -Wa,-m405 -mcpu=405
 endif
-
-# Use default linker script.  Board port can override in board/*/config.mk
-LDSCRIPT := $(SRCTREE)/arch/powerpc/cpu/ppc4xx/u-boot.lds