[U-Boot] [PATCH 02/12] x86: Ensure no instruction sets of MMX/SSE are generated in 64-bit build

[Bin Meng]

With the '-march=core2' fix, it seems that we have some luck that
the 64-bit U-Boot boots again. However if we examine the disassembly
codes there are still SSE instructions elsewhere which means passing
cpu type to GCC is not enough to prevent it from generating these
instructions. A simple test case is doing a 'bootefi selftest' from
the U-Boot shell and it leads to a reset too.

The 'bootefi selftest' reset is even seen with the image created by
the relative older GCC 5.4.0, the one shipped by Ubuntu 16.04.

The reset actually originates from undefined instruction exception
caused by these SSE instructions. To keep U-Boot as a bootloader as
simple as possible, we don't want to handle such advanced SIMD stuff.
To make sure no MMX/SSE instruction sets are generated, tell GCC not
to do this. Note AVX is out of the question as CORE2 is old enough
to support AVX yet.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>

---
Changes in this version:
- revise the commit message for the reason of turning off MMX/SSE

 arch/x86/config.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/config.mk b/arch/x86/config.mk
index 576501e..8151e47 100644
--- a/arch/x86/config.mk
+++ b/arch/x86/config.mk
@@ -24,6 +24,7 @@ ifeq ($(IS_32BIT),y)
 PLATFORM_CPPFLAGS += -march=i386 -m32
 else
 PLATFORM_CPPFLAGS += $(if $(CONFIG_SPL_BUILD),,-fpic) -fno-common -march=core2 -m64
+PLATFORM_CPPFLAGS += -mno-mmx -mno-sse
 endif
 
 PLATFORM_RELFLAGS += -fdata-sections -ffunction-sections -fvisibility=hidden
-- 
2.7.4