[Buildroot] [PATCH 3/3] arch/arm: Add ARMV8 (aarch32) toolchain config.
Matt Flax
flatmax at flatmax.org
Mon Aug 22 10:12:28 UTC 2016
This commit configures the toolchain to use the ARMV8 hardware features.
This commit also cleans up and adds to the previous cortex-a53 commit.
This commit adds BR2_ARM_CPU_HAS_ARMV8 to arch/Config.in.arm and cleans up
the BR2_cortex_a53 config to remove redundant selections relating to VFPV4 and
ARMV7A. The commit also adds BR2_ARM_CPU_HAS_ARMV8 to BR2_ARM_EABIHF which
allows the selection of hard float (HF) activating the toolchain for whatever
specific ARMV8 hardware features are possible. It also adds the
BR2_ARM_FPU_NEON_ARMV8 HF tuning (crypto-neon-fp-armv8).
The cortex-a53 BR2_ARCH_HAS_MMU_OPTIONAL selection ensures that uclibc successfully
compiles without non-compliant swp assembly calls.
Signed-off-by: Matt Flax <flatmax at flatmax.org>
---
arch/Config.in.arm | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/arch/Config.in.arm b/arch/Config.in.arm
index 72bb744..c01daf6 100644
--- a/arch/Config.in.arm
+++ b/arch/Config.in.arm
@@ -31,6 +31,9 @@ config BR2_ARM_CPU_HAS_VFPV4
bool
select BR2_ARM_CPU_HAS_VFPV3
+config BR2_ARM_CPU_HAS_ARMV8
+ bool
+
config BR2_ARM_CPU_HAS_ARM
bool
@@ -174,8 +177,7 @@ config BR2_cortex_a53
bool "cortex-A53"
select BR2_ARM_CPU_HAS_ARM
select BR2_ARM_CPU_HAS_NEON
- select BR2_ARM_CPU_HAS_VFPV4
- select BR2_ARM_CPU_ARMV7A
+ select BR2_ARM_CPU_HAS_ARMV8
select BR2_ARCH_HAS_MMU_OPTIONAL
config BR2_cortex_m3
bool "cortex-M3"
@@ -271,7 +273,7 @@ config BR2_ARM_EABI
config BR2_ARM_EABIHF
bool "EABIhf"
- depends on BR2_ARM_CPU_HAS_VFPV2
+ depends on BR2_ARM_CPU_HAS_VFPV2 || BR2_ARM_CPU_HAS_ARMV8
help
The EABIhf is an extension of EABI which supports the 'hard'
floating point model. This model uses the floating point
@@ -292,6 +294,7 @@ endchoice
choice
prompt "Floating point strategy"
depends on BR2_ARM_EABI || BR2_ARM_EABIHF
+ default BR2_ARM_FPU_NEON_ARMV8 if BR2_ARM_CPU_HAS_ARMV8
default BR2_ARM_FPU_VFPV4D16 if BR2_ARM_CPU_HAS_VFPV4
default BR2_ARM_FPU_VFPV3D16 if BR2_ARM_CPU_HAS_VFPV3
default BR2_ARM_FPU_VFPV2 if BR2_ARM_CPU_HAS_VFPV2
@@ -366,6 +369,13 @@ config BR2_ARM_FPU_VFPV4
cores, including the earlier Cortex-A{8, 9}, you should
instead select VFPv3.
+config BR2_ARM_FPU_NEON_ARMV8
+ bool "ARMV8"
+ depends on BR2_ARM_CPU_HAS_ARMV8
+ help
+ This option allows to use the ARMV8 floating point unit, as
+ available in some ARMv8 processors (Cortex-A53).
+
config BR2_ARM_FPU_VFPV4D16
bool "VFPv4-D16"
depends on BR2_ARM_CPU_HAS_VFPV4
@@ -485,6 +495,7 @@ config BR2_GCC_TARGET_FPU
default "vfpv4-d16" if BR2_ARM_FPU_VFPV4D16
default "neon" if BR2_ARM_FPU_NEON
default "neon-vfpv4" if BR2_ARM_FPU_NEON_VFPV4
+ default "crypto-neon-fp-armv8" if BR2_ARM_FPU_NEON_ARMV8
config BR2_GCC_TARGET_FLOAT_ABI
default "soft" if BR2_ARM_SOFT_FLOAT
--
2.7.4
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