-msingle-pic-base is a new gcc(from 4.6) option for ppc and it reduces the size of my u-boot with about 4-5 KB. While at it, add -fno-jump-tables too to save a few more bytes.
e5500 core: size u-boot.bef text data bss dec hex filename 473043 23772 307104 803919 c444f u-boot.bef size u-boot.aft text data bss dec hex filename 453195 23772 307104 784071 bf6c7 u-boot.aft
e500 core: size u-boot.bef text data bss dec hex filename 292998 17868 24968 335834 51fda u-boot.bef size u-boot.aft text data bss dec hex filename 288002 17868 24968 330838 50c56 u-boot.aft
Signed-off-by: Joakim Tjernlund joakim.tjernlund@infinera.com --- arch/powerpc/cpu/mpc85xx/config.mk | 1 + arch/powerpc/cpu/mpc85xx/start.S | 3 +++ 2 files changed, 4 insertions(+)
diff --git a/arch/powerpc/cpu/mpc85xx/config.mk b/arch/powerpc/cpu/mpc85xx/config.mk index 44d69add68..7a1d81cf2d 100644 --- a/arch/powerpc/cpu/mpc85xx/config.mk +++ b/arch/powerpc/cpu/mpc85xx/config.mk @@ -4,6 +4,7 @@ # Xianghua Xiao, X.Xiao@motorola.com
PLATFORM_CPPFLAGS += -Wa,-me500 -msoft-float -mno-string +PLATFORM_RELFLAGS += -msingle-pic-base -fno-jump-tables
# -mspe=yes is needed to have -mno-spe accepted by a buggy GCC; # see "[PATCH,rs6000] make -mno-spe work as expected" on diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S index 932aa08b27..dbc705388c 100644 --- a/arch/powerpc/cpu/mpc85xx/start.S +++ b/arch/powerpc/cpu/mpc85xx/start.S @@ -1216,6 +1216,9 @@ _start_cont: mr r1,r3 /* Transfer to SP(r1) */
GET_GOT + /* Needed for -msingle-pic-base */ + bl _GLOBAL_OFFSET_TABLE_@local-4 + mflr r30
/* Pass our potential ePAPR device tree pointer to cpu_init_early_f */ mr r3, r24