[U-Boot] [PATCH 3/4] armv7: Use -march=armv7-a and thereby enable Thumb-2
Aneesh V
aneesh at ti.com
Wed Feb 15 14:57:32 CET 2012
Enable -march=armv7-a for armv7 platforms if the tool-chain
supports it. This in turn results in Thumb-2 code generated
for these platforms if CONFIG_SYS_THUMB_BUILD is enabled.
Signed-off-by: Aneesh V <aneesh at ti.com>
---
I believe armv7-a is fine for all the SoCs except Tegra2
and I see that Tegra2 is already making the necessary
exception in .../armv7/tegra2/config.mk
Let me know if any other SoC has a problem with armv7-a
Changes from RFC to V1:
- Enabled armv7-a from armv7/config.mk instead of from
omap config.mk files
---
arch/arm/cpu/armv7/config.mk | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm/cpu/armv7/config.mk b/arch/arm/cpu/armv7/config.mk
index 83ddf10..b66fb6f 100644
--- a/arch/arm/cpu/armv7/config.mk
+++ b/arch/arm/cpu/armv7/config.mk
@@ -22,8 +22,9 @@
#
PLATFORM_RELFLAGS += -fno-common -ffixed-r8 -msoft-float
-# Make ARMv5 to allow more compilers to work, even though its v7a.
-PLATFORM_CPPFLAGS += -march=armv5
+# If armv7-a is not supported by GCC fall-back to armv5, which is
+# supported by more tool-chains
+PLATFORM_CPPFLAGS += $(call cc-option, -march=armv7-a, -march=armv5)
# =========================================================================
#
# Supply options according to compiler version
--
1.7.1
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