PPC: Use r2 instead of r29 as global data pointer

R29 was an unlucky choice as with recent toolchains (gcc-4.2.x) gcc
will refuse to use load/store multiple insns; instead, it issues a
list of simple load/store instructions upon function entry and exit,
resulting in bigger code size, which in turn makes the build for a
few boards fail.

Use r2 instead.

Signed-off-by: Wolfgang Denk <wd@denx.de>

13 files changed, 14 insertions, 13 deletions

diff --git a/cpu/74xx_7xx/config.mk b/cpu/74xx_7xx/config.mk
index 417d99f33b..324f62b836 100644
--- a/cpu/74xx_7xx/config.mk
+++ b/cpu/74xx_7xx/config.mk
@@ -23,4 +23,4 @@
 
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi -fno-strict-aliasing
 
-PLATFORM_CPPFLAGS += -DCONFIG_74xx_7xx -ffixed-r2 -ffixed-r29 -mstring
+PLATFORM_CPPFLAGS += -DCONFIG_74xx_7xx -ffixed-r2 -mstring
diff --git a/cpu/mpc512x/config.mk b/cpu/mpc512x/config.mk
index 8a07c5a3b6..5b7e1f2682 100644
--- a/cpu/mpc512x/config.mk
+++ b/cpu/mpc512x/config.mk
@@ -22,4 +22,4 @@
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
 
 PLATFORM_CPPFLAGS += -DCONFIG_MPC512X -DCONFIG_E300 \
-			-ffixed-r2 -ffixed-r29 -msoft-float -mcpu=603e
+			-ffixed-r2 -msoft-float -mcpu=603e
diff --git a/cpu/mpc5xx/config.mk b/cpu/mpc5xx/config.mk
index 64cd60071a..6d66c32bee 100644
--- a/cpu/mpc5xx/config.mk
+++ b/cpu/mpc5xx/config.mk
@@ -30,7 +30,7 @@
 
 PLATFORM_RELFLAGS += 	-fPIC -ffixed-r14 -meabi
 
-PLATFORM_CPPFLAGS +=	-DCONFIG_5xx -ffixed-r2 -ffixed-r29 -mpowerpc -msoft-float
+PLATFORM_CPPFLAGS +=	-DCONFIG_5xx -ffixed-r2 -mpowerpc -msoft-float
 
 # Use default linker script.  Board port can override in board/*/config.mk
 LDSCRIPT := $(SRCTREE)/cpu/mpc5xx/u-boot.lds
diff --git a/cpu/mpc5xxx/config.mk b/cpu/mpc5xxx/config.mk
index 0df51babd7..b0ce2ee9e3 100644
--- a/cpu/mpc5xxx/config.mk
+++ b/cpu/mpc5xxx/config.mk
@@ -23,7 +23,7 @@
 
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC5xxx -ffixed-r2 -ffixed-r29 \
+PLATFORM_CPPFLAGS += -DCONFIG_MPC5xxx -ffixed-r2 \
 		     -mstring -mcpu=603e -mmultiple
 
 # Use default linker script.  Board port can override in board/*/config.mk
diff --git a/cpu/mpc8220/config.mk b/cpu/mpc8220/config.mk
index 8e3ba54287..5819048d01 100644
--- a/cpu/mpc8220/config.mk
+++ b/cpu/mpc8220/config.mk
@@ -23,7 +23,7 @@
 
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC8220 -ffixed-r2 -ffixed-r29 \
+PLATFORM_CPPFLAGS += -DCONFIG_MPC8220 -ffixed-r2 \
 		     -mstring -mcpu=603e -mmultiple
 
 # Use default linker script.  Board port can override in board/*/config.mk
diff --git a/cpu/mpc824x/config.mk b/cpu/mpc824x/config.mk
index 66207f4354..1bb0487bd3 100644
--- a/cpu/mpc824x/config.mk
+++ b/cpu/mpc824x/config.mk
@@ -23,7 +23,7 @@
 
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi -fno-strict-aliasing
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC824X -ffixed-r2 -ffixed-r29 -mstring -mcpu=603e -msoft-float
+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)/cpu/mpc824x/u-boot.lds
diff --git a/cpu/mpc8260/config.mk b/cpu/mpc8260/config.mk
index 683b6fbf2b..2cb027093b 100644
--- a/cpu/mpc8260/config.mk
+++ b/cpu/mpc8260/config.mk
@@ -23,7 +23,7 @@
 
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
 
-PLATFORM_CPPFLAGS += -DCONFIG_8260 -DCONFIG_CPM2 -ffixed-r2 -ffixed-r29 \
+PLATFORM_CPPFLAGS += -DCONFIG_8260 -DCONFIG_CPM2 -ffixed-r2 \
 		     -mstring -mcpu=603e -mmultiple
 
 # Use default linker script.  Board port can override in board/*/config.mk
diff --git a/cpu/mpc83xx/config.mk b/cpu/mpc83xx/config.mk
index ecf8a60bbe..2f0f1ce1ef 100644
--- a/cpu/mpc83xx/config.mk
+++ b/cpu/mpc83xx/config.mk
@@ -23,7 +23,7 @@
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
 
 PLATFORM_CPPFLAGS += -DCONFIG_MPC83XX -DCONFIG_E300 \
-			-ffixed-r2 -ffixed-r29 -msoft-float
+			-ffixed-r2 -msoft-float
 
 # Use default linker script.  Board port can override in board/*/config.mk
 LDSCRIPT := $(SRCTREE)/cpu/mpc83xx/u-boot.lds
diff --git a/cpu/mpc85xx/config.mk b/cpu/mpc85xx/config.mk
index 6121074349..f6df702e52 100644
--- a/cpu/mpc85xx/config.mk
+++ b/cpu/mpc85xx/config.mk
@@ -23,4 +23,5 @@
 
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC85xx -DCONFIG_E500 -ffixed-r2 -ffixed-r29 -Wa,-me500 -msoft-float -mno-string
+PLATFORM_CPPFLAGS += -DCONFIG_MPC85xx -DCONFIG_E500 -ffixed-r2 \
+			-Wa,-me500 -msoft-float -mno-string
diff --git a/cpu/mpc86xx/config.mk b/cpu/mpc86xx/config.mk
index 3c54f4ad39..d767269ad3 100644
--- a/cpu/mpc86xx/config.mk
+++ b/cpu/mpc86xx/config.mk
@@ -23,4 +23,4 @@
 
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi
 
-PLATFORM_CPPFLAGS += -DCONFIG_MPC86xx -ffixed-r2 -ffixed-r29 -mstring
+PLATFORM_CPPFLAGS += -DCONFIG_MPC86xx -ffixed-r2 -mstring
diff --git a/cpu/mpc86xx/start.S b/cpu/mpc86xx/start.S
index fa9736bce0..09f4ceedb5 100644
--- a/cpu/mpc86xx/start.S
+++ b/cpu/mpc86xx/start.S
@@ -723,7 +723,7 @@ relocate_code:
 
 	mr	r1,  r3		/* Set new stack pointer		*/
 	mr	r9,  r4		/* Save copy of Global Data pointer	*/
-	mr	r29, r9		/* Save for DECLARE_GLOBAL_DATA_PTR	*/
+	mr	r2,  r9		/* Save for DECLARE_GLOBAL_DATA_PTR	*/
 	mr	r10, r5		/* Save copy of Destination Address	*/
 
 	mr	r3,  r5				/* Destination Address	*/
diff --git a/cpu/mpc8xx/config.mk b/cpu/mpc8xx/config.mk
index bfa6625fa8..6031e7f76a 100644
--- a/cpu/mpc8xx/config.mk
+++ b/cpu/mpc8xx/config.mk
@@ -23,4 +23,4 @@
 
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi -fno-strict-aliasing
 
-PLATFORM_CPPFLAGS += -DCONFIG_8xx -ffixed-r2 -ffixed-r29 -mstring -mcpu=860 -msoft-float
+PLATFORM_CPPFLAGS += -DCONFIG_8xx -ffixed-r2 -mstring -mcpu=860 -msoft-float
diff --git a/cpu/ppc4xx/config.mk b/cpu/ppc4xx/config.mk
index 4fd510899c..311c97b732 100644
--- a/cpu/ppc4xx/config.mk
+++ b/cpu/ppc4xx/config.mk
@@ -22,7 +22,7 @@
 #
 
 PLATFORM_RELFLAGS += -fPIC -ffixed-r14 -meabi -fno-strict-aliasing
-PLATFORM_CPPFLAGS += -DCONFIG_4xx -ffixed-r2 -ffixed-r29 -mstring -msoft-float
+PLATFORM_CPPFLAGS += -DCONFIG_4xx -ffixed-r2 -mstring -msoft-float
 
 cfg=$(shell grep configs $(OBJTREE)/include/config.h | sed 's/.*<\(configs.*\)>/\1/')
 is440=$(shell grep CONFIG_440 $(TOPDIR)/include/$(cfg))