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
--- arch/powerpc/config.mk | 4 ++-- arch/powerpc/cpu/mpc85xx/config.mk | 4 ---- 2 files changed, 2 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/config.mk b/arch/powerpc/config.mk index 5bc849c..2912604 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 3f3d096..66d1741 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