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authorWolfgang Denk <wd@denx.de>2010-11-21 20:46:02 +0100
committerWolfgang Denk <wd@denx.de>2010-11-27 23:35:08 +0100
commitc08e5cf7c7cef0db7e85cd8aa14d279221ed2480 (patch)
tree4c30f7d3173c593bb893a0c50b94a3fff6c2c368
parentf1c574d4006d81301792e70fafc31ff39259e793 (diff)
downloadu-boot-linaro-natty-c08e5cf7c7cef0db7e85cd8aa14d279221ed2480.tar.gz
POWERPC: enable --gc-sections and -ffunction-sections -fdata-sections
The switch from archive libraries to partial linking has introduced a number of problems, that are non-trivial to solve. For example, it is no longer possible to include individual object files in the linker script as we did before for example in the case of boards with embedded environment to fill up the gap caused by the need to align the environment on flash erase block boundaries. The best (but unfortunately not easiest) approach to address this problem is to enable -ffunction-sections (and -fdata-sections) so we can again (and even in much finer granularity) place certain code where we want it. When doing this step, it seems only consequent to also add --gc-sections which has the added benefit of reducing the memory footprint of the U-Boot image (both in flash and in RAM). Unfortunately, this requires changes to a lot of linker scripts. Signed-off-by: Wolfgang Denk <wd@denx.de> Cc: Stefan Roese <sr@denx.de> Cc: Kim Phillips <kim.phillips@freescale.com> Cc: Andy Fleming <afleming@gmail.com> Cc: Kumar Gala <galak@kernel.crashing.org> Acked-by: Stefan Roese <sr@denx.de>
-rw-r--r--arch/powerpc/config.mk4
-rw-r--r--arch/powerpc/cpu/mpc85xx/config.mk4
2 files changed, 2 insertions, 6 deletions
diff --git a/arch/powerpc/config.mk b/arch/powerpc/config.mk
index 5bc849c5e..2912604af 100644
--- a/arch/powerpc/config.mk
+++ b/arch/powerpc/config.mk
@@ -25,9 +25,9 @@ CROSS_COMPILE ?= ppc_8xx-
STANDALONE_LOAD_ADDR = 0x40000
-PLATFORM_RELFLAGS += -mrelocatable
+PLATFORM_RELFLAGS += -mrelocatable -ffunction-sections -fdata-sections
PLATFORM_CPPFLAGS += -DCONFIG_PPC -D__powerpc__
-PLATFORM_LDFLAGS += -n
+PLATFORM_LDFLAGS += -n --gc-sections
ifdef CONFIG_SYS_LDSCRIPT
# need to strip off double quotes
diff --git a/arch/powerpc/cpu/mpc85xx/config.mk b/arch/powerpc/cpu/mpc85xx/config.mk
index 3f3d096a3..66d1741cc 100644
--- a/arch/powerpc/cpu/mpc85xx/config.mk
+++ b/arch/powerpc/cpu/mpc85xx/config.mk
@@ -25,10 +25,6 @@ PLATFORM_RELFLAGS += -fPIC -meabi
PLATFORM_CPPFLAGS += -ffixed-r2 -Wa,-me500 -msoft-float -mno-string
-# Enable gc-sections to enable generation of smaller images.
-PLATFORM_LDFLAGS += --gc-sections
-PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
-
# -mspe=yes is needed to have -mno-spe accepted by a buggy GCC;
# see "[PATCH,rs6000] make -mno-spe work as expected" on
# http://gcc.gnu.org/ml/gcc-patches/2008-04/msg00311.html