-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.tjernl...@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
--
2.18.1
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