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toolchain/toolchain-external/toolchain-external-arm-arm: add dependency on NEON

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While testing Buildroot on a Cortex-A5 that doesn't provide NEON, we
found out that a system generated with the ARM toolchain from Arm
didn't boot. It turns out that this ARM toolchain is built with:

  --with-arch=armv7-a --with-fpu=neon --with-float=hard --with-mode=thumb

So, it uses NEON as its FPU, which means it can only work on CPU cores
that have NEON support. This commit adds the appropriate dependency to
the toolchain-external-arm-arm package, and adjusts the Config.in help
text accordingly.

While at it, it also drops the part of the Config.in help text that
says the code is tuned for Cortex-A9, as it is not the case: it was
the case for the Linaro toolchain (built with --with-tune=cortex-a9),
but not for the ARM toolchain, for which no specific --with-tune is
passed.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni 2020-11-14 11:48:07 +01:00 committed by Peter Korsgaard
parent e3a663f570
commit 8477c41244
1 changed files with 7 additions and 6 deletions
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13
toolchain/toolchain-external/toolchain-external-arm-arm/Config.in
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@ -1,12 +1,13 @@
comment "Arm toolchains available for Cortex-A + EABIhf"
comment "Arm toolchains available for Cortex-A with NEON + EABIhf"
depends on BR2_arm
depends on !BR2_ARM_CPU_ARMV7A || !BR2_ARM_EABIHF
depends on !BR2_ARM_CPU_ARMV7A || !BR2_ARM_EABIHF || !BR2_ARM_CPU_HAS_NEON
depends on !BR2_STATIC_LIBS
config BR2_TOOLCHAIN_EXTERNAL_ARM_ARM
bool "Arm ARM 2019.12"
depends on BR2_arm
depends on BR2_ARM_CPU_ARMV7A || BR2_ARM_CPU_ARMV8A
depends on BR2_ARM_CPU_HAS_NEON
depends on BR2_HOSTARCH = "x86_64"
depends on BR2_ARM_EABIHF
depends on !BR2_STATIC_LIBS
@ -20,10 +21,10 @@ config BR2_TOOLCHAIN_EXTERNAL_ARM_ARM
select BR2_TOOLCHAIN_HAS_OPENMP
help
Arm toolchain for the ARM architecture. It uses GCC 9.2.1,
GDB 8.3.0, glibc 2.30, Binutils 2.33.1. It generates code that
runs on all Cortex-A profile devices, but tuned for the
Cortex-A9. The code generated uses the hard floating point
calling convention, and uses the VFPv3-D16 FPU instructions.
GDB 8.3.0, glibc 2.30, Binutils 2.33.1. It generates code
that runs on all Cortex-A profile devices. The code
generated uses the hard floating point calling convention,
and uses the NEON FPU instructions.
This is the same toolchain that was previously distributed by
Linaro.