x86: Specify -march=core2 to build 64-bit U-Boot proper
With newer kernel.org GCC (7.3.0 or 8.1.0), the u-boot.rom image
built for qemu-x86_64 target does not boot. It keeps resetting
soon after the 32-bit SPL jumps to 64-bit proper. Debugging shows
that the reset happens inside env_callback_init().
000000000113dd85 <env_callback_init>:
113dd85: 41 54 push %r12
113dd87: 55 push %rbp
113dd88: 31 c0 xor %eax,%eax
113dd8a: 53 push %rbx
113dd8b: 0f 57 c0 xorps %xmm0,%xmm0
Executing "xorps %xmm0,%xmm0" causes CPU to immediately reset.
However older GCC like 5.4.0 (the one shipped by Ubuntu 16.04)
does not generate such instructions that utilizes SSE for this
function - env_callback_init() and U-Boot boots without any issue.
Explicitly specifying -march=core2 for newer GCC allows U-Boot
proper to boot again. Examine assembly codes of env_callback_init
and there is no SSE instruction in that function hence U-Boot
continues to boot.
core2 seems to be the oldest arch in GCC that supports 64-bit.
Like 32-bit U-Boot build we use -march=i386 which is the most
conservative cpu type so that the image can run on any x86
processor, let's do the same for the 64-bit U-Boot build.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/config.mk b/arch/x86/config.mk
index cc94071..576501e 100644
--- a/arch/x86/config.mk
+++ b/arch/x86/config.mk
@@ -23,7 +23,7 @@
ifeq ($(IS_32BIT),y)
PLATFORM_CPPFLAGS += -march=i386 -m32
else
-PLATFORM_CPPFLAGS += $(if $(CONFIG_SPL_BUILD),,-fpic) -fno-common -m64
+PLATFORM_CPPFLAGS += $(if $(CONFIG_SPL_BUILD),,-fpic) -fno-common -march=core2 -m64
endif
PLATFORM_RELFLAGS += -fdata-sections -ffunction-sections -fvisibility=hidden