-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 KB. While at it, add -fno-jump-tables too to save a few more bytes.
Signed-off-by: Joakim Tjernlund joakim.tjernlund@infinera.com ---
I think all PowerPC's can use this but I have only tested 83xx so just enable for this cpu for now.
arch/powerpc/cpu/mpc83xx/config.mk | 1 + arch/powerpc/cpu/mpc83xx/start.S | 3 +++ 2 files changed, 4 insertions(+)
diff --git a/arch/powerpc/cpu/mpc83xx/config.mk b/arch/powerpc/cpu/mpc83xx/config.mk index 14870eec4d..a07df4d389 100644 --- a/arch/powerpc/cpu/mpc83xx/config.mk +++ b/arch/powerpc/cpu/mpc83xx/config.mk @@ -3,3 +3,4 @@ # Copyright 2004 Freescale Semiconductor, Inc.
PLATFORM_CPPFLAGS += -DCONFIG_E300 -msoft-float +PLATFORM_RELFLAGS += -msingle-pic-base -fno-jump-tables diff --git a/arch/powerpc/cpu/mpc83xx/start.S b/arch/powerpc/cpu/mpc83xx/start.S index a3bacf138c..c00bb31363 100644 --- a/arch/powerpc/cpu/mpc83xx/start.S +++ b/arch/powerpc/cpu/mpc83xx/start.S @@ -288,6 +288,9 @@ in_flash: /*------------------------------------------------------*/
GET_GOT /* initialize GOT access */ + /* Needed for -msingle-pic-base */ + bl _GLOBAL_OFFSET_TABLE_@local-4 + mflr r30
/* r3: IMMR */ lis r3, CONFIG_SYS_IMMR@h