[U-Boot] [PATCH] arm: arm64: only use general regs

Peng Fan
2017-11-28T02:09:37Z

When compiling with android toolchain, there is an instruction
"str q0, [x8],#16", but x8 is not 16bytes aligned,
this instruction will trigger sync abort.

So, following Linux kernel, only use general regs for arm64.
If not, compiler may use simd registers Q[x]. We need to avoid
using simd registers in U-Boot, because load/store Q[x] has
restriction that 128bits aligned when str/ldr.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
arch/arm/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 5881fdc8e2..4db0398dde 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -18,7 +18,7 @@ arch-$(CONFIG_CPU_ARM1136) =-march=armv5
arch-$(CONFIG_CPU_ARM1176) =-march=armv5t
arch-$(CONFIG_CPU_V7) =$(call cc-option, -march=armv7-a, \
$(call cc-option, -march=armv7, -march=armv5))
-arch-$(CONFIG_ARM64) =-march=armv8-a
+arch-$(CONFIG_ARM64) =-march=armv8-a -mgeneral-regs-only

# On Tegra systems we must build SPL for the armv4 core on the device
# but otherwise we can use the value in CONFIG_SYS_ARM_ARCH
--
2.14.1