diff options
| author | Yann E. MORIN <yann.morin.1998@free.fr> | 2018-02-25 21:18:14 +0100 |
|---|---|---|
| committer | Thomas Petazzoni <thomas.petazzoni@bootlin.com> | 2018-05-20 19:01:34 +0200 |
| commit | 7f7701301edc18042d6bd47b7ca3aae7c597670f (patch) | |
| tree | 3eb0a2f7010203eb54d1b44e8f57e1e303af7b14 /arch | |
| parent | 6edfa3bf781606eb6747739f289e5319421daddc (diff) | |
arch/arm: introduce generic FPU internal option
Currently, we consider that any VFP FPU is a superset of VFPv2, and thus
we use VFPv2 as a way to detect that a VFP is used.
However, for Cortex-M cores, the optional FPU is not a superset of
VFPv2; it is even not a VFP [0].
As a consequence, we can no longer consider VFPv2 as a indication that
an FPU is present.
So, we introduce two new internal options, BR2_ARM_CPU_MAYBE_HAS_FPU and
BR2_ARM_CPU_HAS_FPU, which we use to consider the presence of an FPU.
[0] https://en.wikipedia.org/wiki/ARM_Cortex-M#Cortex-M4
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/Config.in.arm | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/arch/Config.in.arm b/arch/Config.in.arm index 7651d10927..c2f3f8d9a3 100644 --- a/arch/Config.in.arm +++ b/arch/Config.in.arm @@ -6,12 +6,21 @@ config BR2_ARM_CPU_HAS_NEON config BR2_ARM_CPU_MAYBE_HAS_NEON bool +# For some cores, the FPU is optional +config BR2_ARM_CPU_MAYBE_HAS_FPU + bool + +config BR2_ARM_CPU_HAS_FPU + bool + # for some cores, VFPv2 is optional config BR2_ARM_CPU_MAYBE_HAS_VFPV2 bool + select BR2_ARM_CPU_MAYBE_HAS_FPU config BR2_ARM_CPU_HAS_VFPV2 bool + select BR2_ARM_CPU_HAS_FPU # for some cores, VFPv3 is optional config BR2_ARM_CPU_MAYBE_HAS_VFPV3 @@ -450,7 +459,7 @@ config BR2_ARM_ENABLE_NEON config BR2_ARM_ENABLE_VFP bool "Enable VFP extension support" - depends on BR2_ARM_CPU_MAYBE_HAS_VFPV2 + depends on BR2_ARM_CPU_MAYBE_HAS_FPU select BR2_ARM_CPU_HAS_VFPV4 if BR2_ARM_CPU_MAYBE_HAS_VFPV4 select BR2_ARM_CPU_HAS_VFPV3 if BR2_ARM_CPU_MAYBE_HAS_VFPV3 select BR2_ARM_CPU_HAS_VFPV2 if BR2_ARM_CPU_MAYBE_HAS_VFPV2 @@ -461,7 +470,7 @@ config BR2_ARM_ENABLE_VFP choice prompt "Target ABI" - default BR2_ARM_EABIHF if BR2_ARM_CPU_HAS_VFPV2 + default BR2_ARM_EABIHF if BR2_ARM_CPU_HAS_FPU default BR2_ARM_EABI depends on BR2_arm || BR2_armeb help @@ -496,7 +505,7 @@ config BR2_ARM_EABI config BR2_ARM_EABIHF bool "EABIhf" - depends on BR2_ARM_CPU_HAS_VFPV2 + depends on BR2_ARM_CPU_HAS_FPU help The EABIhf is an extension of EABI which supports the 'hard' floating point model. This model uses the floating point @@ -520,7 +529,7 @@ choice 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 - default BR2_ARM_SOFT_FLOAT if !BR2_ARM_CPU_HAS_VFPV2 + default BR2_ARM_SOFT_FLOAT if !BR2_ARM_CPU_HAS_FPU config BR2_ARM_SOFT_FLOAT bool "Soft float" |