On an XPedite5170 over 11KBytes were saved: Before: text data bss dec hex filename 319488 28700 33204 381392 5d1d0 ./u-boot
After: text data bss dec hex filename 307663 29144 33204 370011 5a55b ./u-boot
Signed-off-by: Peter Tyser ptyser@xes-inc.com CC: Kumar Gala galak@kernel.crashing.org --- arch/powerpc/cpu/mpc86xx/config.mk | 4 ++++ arch/powerpc/cpu/mpc86xx/u-boot.lds | 26 ++++++++------------------ 2 files changed, 12 insertions(+), 18 deletions(-)
diff --git a/arch/powerpc/cpu/mpc86xx/config.mk b/arch/powerpc/cpu/mpc86xx/config.mk index 7fae7e4..bce0fb3 100644 --- a/arch/powerpc/cpu/mpc86xx/config.mk +++ b/arch/powerpc/cpu/mpc86xx/config.mk @@ -26,5 +26,9 @@ 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 diff --git a/arch/powerpc/cpu/mpc86xx/u-boot.lds b/arch/powerpc/cpu/mpc86xx/u-boot.lds index 4cea3b3..4bfcb90 100644 --- a/arch/powerpc/cpu/mpc86xx/u-boot.lds +++ b/arch/powerpc/cpu/mpc86xx/u-boot.lds @@ -60,19 +60,14 @@ SECTIONS lib/crc32.o (.text) arch/powerpc/lib/extable.o (.text) lib/zlib.o (.text) - *(.text) - *(.got1) + *(.text*) } _etext = .; PROVIDE (etext = .); .rodata : { - *(.eh_frame) *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) } - .fini : { *(.fini) } =0 - .ctors : { *(.ctors) } - .dtors : { *(.dtors) }
/* Read-write section, merged into data segment: */ . = (. + 0x00FF) & 0xFFFFFF00; @@ -80,23 +75,19 @@ SECTIONS PROVIDE (erotext = .); .reloc : { - *(.got) + KEEP(*(.got)) _GOT2_TABLE_ = .; - *(.got2) + KEEP(*(.got2)) _FIXUP_TABLE_ = .; - *(.fixup) + KEEP(*(.fixup)) } __got2_entries = (_FIXUP_TABLE_ - _GOT2_TABLE_) >> 2; __fixup_entries = (. - _FIXUP_TABLE_) >> 2;
.data : { - *(.data) - *(.data1) - *(.sdata) - *(.sdata2) - *(.dynamic) - CONSTRUCTORS + *(.data*) + *(.sdata*) } _edata = .; PROVIDE (edata = .); @@ -121,9 +112,8 @@ SECTIONS __bss_start = .; .bss (NOLOAD) : { - *(.sbss) *(.scommon) - *(.dynbss) - *(.bss) + *(.sbss*) + *(.bss*) *(COMMON) . = ALIGN(4); }